Christoph Keller's Publications

All Publications

360

A survey of the linear polarization of directly imaged exoplanets and brown dwarf companions with SPHERE-IRDIS. First polarimetric detections revealing disks around DH Tau B and GSC 6214-210 B

van Holstein, R. G.,Stolker, T.,Jensen-Clem, R.,Ginski, C.,Milli, J.,de Boer, J.,Girard, J. H.,Wahhaj, Z.,Bohn, A. J.,Millar-Blanchaer, M. A.,Benisty, M.,Bonnefoy, M.,Chauvin, G.,Dominik, C.,Hinkley, S.,Keller, C. U.,Keppler, M.,Langlois, M.,Marino, S.,Ménard, F.,Perrot, C.,Schmidt, T. O. B.,Vigan, A.,Zurlo, A.,Snik, F.,

Jan 2021
eprint arXiv:2101.04033

359

Focal plane wavefront sensing on SUBARU/SCExAO

Vievard, S.,Bos, S. P.,Cassaing, F.,Currie, T.,Deo, V.,Guyon, O.,Jovanovic, N.,Keller, C. U.,Lamb, M.,Lopez, C.,Lozi, J.,Martinache, F.,Miller, K.,Montmerle-Bonnefois, A.,Mugnier, L. M.,N'Diaye, M.,Norris, B.,Sahoo, A.,Sauvage, J. -F.,Skaf, N.,Snik, F.,Wilby, M. J.,Wong, A.,

Dec 2020
Proceedings of the SPIE, Volume 11448, id. 114486D 17 pp. (2020).

358

Multi-core fibre-fed integral-field unit (MCIFU): overview and first-light

Haffert, Sebastiaan Y.,Harris, Robert J.,Zanutta, Alessio,Pike, Fraser A.,Bianco, Andrea,Redaelli, Edoardo,BenoÃ®t, Aurélien,MacLachlan, David G.,Ross, Calum A.,Gris-Sánchez, Itandehui,Trappen, Mareike D.,Xu, Yilin,Blaicher, Matthias,Maier, Pascal,Riva, Giulio,Sinquin, Baptiste,Kulcsár, Caroline,Bharmal, Nazim Ali,Gendron, Eric,Staykov, Lazar,Morris, Tim J.,Barboza, Santiago,Muench, Norbert,Bardour, Lisa,Prengère, Léonard,Raynaud, Henri-François,Hottinger, Philipp,Anagnos, Theodoros,Osborn, James,Koos, Christian,Thompson, Robert R.,Birks, Tim A.,Snellen, Ignas A. G.,Keller, Christoph U.,Close, Laird,Males, Jared R.,

Dec 2020
Proceedings of the SPIE, Volume 11448, id. 114484M 11 pp. (2020).

357

MagAO-X first light

Males, Jared R.,Close, Laird M.,Guyon, Olivier,Hedglen, Alexander D.,Van Gorkom, Kyle,Long, Joseph D.,Kautz, Maggie,Lumbres, Jennifer,Schatz, Lauren,Rodack, Alexander,Miller, Kelsey,Doelman, David,Snik, Frans,Bos, Steven,Knight, Justin M.,Morzinski, Katie,Gasho, Victor,Keller, Christoph,Haffert, Sebastiaan,Pearce, Logan,

Dec 2020
Proceedings of the SPIE, Volume 11448, id. 114484L 8 pp. (2020).

356

Self-optimizing adaptive optics control with reinforcement learning

Landman, R.,Haffert, S. Y.,Radhakrishnan, V. M.,Keller, C. U.,

Dec 2020
Proceedings of the SPIE, Volume 11448, id. 1144849 15 pp. (2020).

355

Using the generalised-optical differentiation wavefront sensor for laser guide star wavefront sensing

Haffert, Sebastiaan Y.,Keller, Christoph U.,Dekany, Richard,

Dec 2020
Proceedings of the SPIE, Volume 11448, id. 114481T 10 pp. (2020).

354

Prediction of the planet yield of the MaxProtoPlanetS high-contrast survey for H-alpha protoplanets with MagAO-X based on first light contrasts

Close, Laird M.,Males, Jared,Long, Joseph D.,Van Gorkom, Kyle,Hedglen, Alexander D.,Kautz, Maggie,Lumbres, Jennifer,Haffert, Sebastiaan Y.,Follette, Katherine,Wagner, Kevin,Miller, Kelsey,Apai, Daniel,Wu, Ya-Lin,Guyon, Olivier,Schatz, Lauren,Rodack, Alex,Doelman, David,Snik, Frans,Knight, Justin M.,Morzinski, Katie,Gasho, Victor,Keller, Christoph,Pearce, Logan,Weinberger, Alycia,Pérez, Laura,Doyon, René,

Dec 2020
Proceedings of the SPIE, Volume 11448, id. 114480U 18 pp. (2020).

353

Planet formation with all flavors of adaptive optics: VLT/MUSE's laser tomography adaptive optics to directly image young accreting exoplanets

Girard, Julien H.,Haffert, Sebastiaan Y.,Bae, Jaehan,Zeidler, Peter,de Boer, Jozua,Bohn, Alexander,van Holstein, Rob G.,Brinchmann, Jarle,Snellen, Ignas,Bacon, Rolan,Keller, Christoph,

Dec 2020
Proceedings of the SPIE, Volume 11448, id. 1144808 12 pp. (2020).

352

Design of the life signature detection polarimeter LSDpol

Keller, Christoph U.,Snik, Frans,Patty, C. H. Lucas,Klindžic, Dora,Krasteva, Mariya,Doelman, David S.,Wijnen, Thomas,Pallichadath, Vidhya,Stam, Daphne M.,Demory, Brice-Olivier,Kühn, Jonas G.,Hoeijmakers, H. Jens,Pommerol, Antoine,Poch, Olivier,

Dec 2020
Proceedings of the SPIE, Volume 11443, id. 114433R 10 pp. (2020).

351

Searching for proto-planets with MUSE

Xie, C.,Haffert, S. Y.,de Boer, J.,Kenworthy, M. A.,Brinchmann, J.,Girard, J.,Snellen, I. A. G.,Keller, C. U.,

Dec 2020
Astronomy & Astrophysics, Volume 644, id.A149, 14 pp.

350

Diffraction-limited integral-field spectroscopy for extreme adaptive optics systems with the multicore fiber-fed integral-field unit

Haffert, Sebastiaan Y.,Harris, Robert J.,Zanutta, Alessio,Pike, Fraser A.,Bianco, Andrea,Redaelli, Eduardo,BenoÃ®t, Aurélien,MacLachlan, David G.,Ross, Calum A.,Gris-Sánchez, Itandehui,Trappen, Mareike D.,Xu, Yilin,Blaicher, Matthias,Maier, Pascal,Riva, Giulio,Sinquin, Baptiste,Kulcsár, Caroline,Bharmal, Nazim Ali,Gendron, Eric,Staykov, Lazar,Morris, Tim J.,Barboza, Santiago,Muench, Norbert,Bardou, Lisa,Prengère, Léonard,Raynaud, Henri-François,Hottinger, Phillip,Anagnos, Theodoros,Osborn, James,Koos, Christian,Thomson, Robert R.,Birks, Tim A.,Snellen, Ignas A. G.,Keller, Christoph U.,

Oct 2020
Journal of Astronomical Telescopes, Instruments, and Systems, Volume 6, id. 045007 (2020).

349

CS Cha B: A disc-obscured M-type star mimicking a polarised planetary companion

Haffert, S. Y.,van Holstein, R. G.,Ginski, C.,Brinchmann, J.,Snellen, I. A. G.,Milli, J.,Stolker, T.,Keller, C. U.,Girard, J.,

Aug 2020
Astronomy & Astrophysics, Volume 640, id.L12, 8 pp.

348

Two Directly Imaged, Wide-orbit Giant Planets around the Young, Solar Analog TYC 8998-760-1

Bohn, Alexander J.,Kenworthy, Matthew A.,Ginski, Christian,Rieder, Steven,Mamajek, Eric E.,Meshkat, Tiffany,Pecaut, Mark J.,Reggiani, Maddalena,de Boer, Jozua,Keller, Christoph U.,Snik, Frans,Southworth, John,

Jul 2020
The Astrophysical Journal Letters, Volume 898, Issue 1, id.L16

347

On-sky verification of Fast and Furious focal-plane wavefront sensing: Moving forward toward controlling the island effect at Subaru/SCExAO

Bos, S. P.,Vievard, S.,Wilby, M. J.,Snik, F.,Lozi, J.,Guyon, O.,Norris, B. R. M.,Jovanovic, N.,Martinache, F.,Sauvage, J.-F.,Keller, C. U.,

Jul 2020
Astronomy & Astrophysics, Volume 639, id.A52, 12 pp.

346

A universal smartphone add-on for portable spectroscopy and polarimetry: iSPEX 2

Burggraaff, Olivier,Perduijn, Armand B.,van Hek, Robert F.,Schmidt, Norbert,Keller, Christoph U.,Snik, Frans,

May 2020
Proceedings of the SPIE, Volume 11389, id. 113892K 16 pp. (2020).

345

SPHERE+: Imaging young Jupiters down to the snowline

Boccaletti, A.,Chauvin, G.,Mouillet, D.,Absil, O.,Allard, F.,Antoniucci, S.,Augereau, J.-C.,Barge, P.,Baruffolo, A.,Baudino, J.-L.,Baudoz, P.,Beaulieu, M.,Benisty, M.,Beuzit, J.-L.,Bianco, A.,Biller, B.,Bonavita, B.,Bonnefoy, M.,Bos, S.,Bouret, J.-C.,Brandner, W.,Buchschache, N.,Carry, B.,Cantalloube, F.,Cascone, E.,Carlotti, A.,Charnay, B.,Chiavassa, A.,Choquet, E.,Clenet, Y.,Crida, A.,De Boer, J.,De Caprio, V.,Desidera, S.,Desert, J.-M.,Delisle, J.-B.,Delorme, P.,Dohlen, K.,Doelman, D.,Dominik, C.,Orazi, V. D,Dougados, C.,Doute, S.,Fedele, D.,Feldt, M.,Ferreira, F.,Fontanive, C.,Fusco, T.,Galicher, R.,Garufi, A.,Gendron, E.,Ghedina, A.,Ginski, C.,Gonzalez, J.-F.,Gratadour, D.,Gratton, R.,Guillot, T.,Haffert, S.,Hagelberg, J.,Henning, T.,Huby, E.,Janson, M.,Kamp, I.,Keller, C.,Kenworthy, M.,Kervella, P.,Kral, Q.,Kuhn, J.,Lagadec, E.,Laibe, G.,Langlois, M.,Lagrange, A.-M.,Launhardt, R.,Leboulleux, L.,Le Coroller, H.,Li Causi, G.,Loupias, M.,Maire, A. L.,Marleau, G.,Martinache, F.,Martinez, P.,Mary, D.,Mattioli, M.,Mazoyer, J.,Meheut, H.,Menard, F.,Mesa, D.,Meunier, N.,Miguel, Y.,Milli, J.,Min, M.,Molliere, P.,Mordasini, C.,Moretto, G.,Mugnier, L.,Muro Arena, G.,Nardetto, N.,Diaye, M. N,Nesvadba, N.,Pedichini, F.,Pinilla, P.,Por, E.,Potier, A.,Quanz, S.,Rameau, J.,Roelfsema, R.,Rouan, D.,Rigliaco, E.,Salasnich, B.,Samland, M.,Sauvage, J.-F.,Schmid, H.-M.,Segransan, D.,Snellen, I.,Snik, F.,Soulez, F.,Stadler, E.,Stam, D.,Tallon, M.,Thebault, P.,Thiebaut, E.,Tschudi, C.,Udry, S.,van Holstein, R.,Vernazza, P.,Vidal, F.,Vigan, A.,Waters, R.,Wildi, F.,Willson, M.,Zanutta, A.,Zavagno, A.,Zurlo, A.,

Mar 2020
eprint arXiv:2003.05714

344

The Single-mode Complex Amplitude Refinement (SCAR) coronagraph. II. Lab verification, and toward the characterization of Proxima b

Haffert, S. Y.,Por, E. H.,Keller, C. U.,Kenworthy, M. A.,Doelman, D. S.,Snik, F.,Escuti, M. J.,

Mar 2020
Astronomy & Astrophysics, Volume 635, id.A56, 9 pp.

343

The Young Suns Exoplanet Survey: Detection of a wide-orbit planetary-mass companion to a solar-type Sco-Cen member

Bohn, A. J.,Kenworthy, M. A.,Ginski, C.,Manara, C. F.,Pecaut, M. J.,de Boer, J.,Keller, C. U.,Mamajek, E. E.,Meshkat, T.,Reggiani, M.,Todorov, K. O.,Snik, F.,

Feb 2020
Monthly Notices of the Royal Astronomical Society, Volume 492, Issue 1, p.431-443

342

RefPlanets: Search for reflected light from extrasolar planets with SPHERE/ZIMPOL

Hunziker, S.,Schmid, H. M.,Mouillet, D.,Milli, J.,Zurlo, A.,Delorme, P.,Abe, L.,Avenhaus, H.,Baruffolo, A.,Bazzon, A.,Boccaletti, A.,Baudoz, P.,Beuzit, J. L.,Carbillet, M.,Chauvin, G.,Claudi, R.,Costille, A.,Daban, J.-B.,Desidera, S.,Dohlen, K.,Dominik, C.,Downing, M.,Engler, N.,Feldt, M.,Fusco, T.,Ginski, C.,Gisler, D.,Girard, J. H.,Gratton, R.,Henning, Th.,Hubin, N.,Kasper, M.,Keller, C. U.,Langlois, M.,Lagadec, E.,Martinez, P.,Maire, A. L.,Menard, F.,Meyer, M. R.,Pavlov, A.,Pragt, J.,Puget, P.,Quanz, S. P.,Rickman, E.,Roelfsema, R.,Salasnich, B.,Sauvage, J.-F.,Siebenmorgen, R.,Sissa, E.,Snik, F.,Suarez, M.,Szulágyi, J.,Thalmann, Ch.,Turatto, M.,Udry, S.,van Holstein, R. G.,Vigan, A.,Wildi, F.,

Feb 2020
Astronomy & Astrophysics, Volume 634, id.A69, 23 pp.

341

Polarimetric imaging mode of VLT/SPHERE/IRDIS. II. Characterization and correction of instrumental polarization effects

van Holstein, R. G.,Girard, J. H.,de Boer, J.,Snik, F.,Milli, J.,Stam, D. M.,Ginski, C.,Mouillet, D.,Wahhaj, Z.,Schmid, H. M.,Keller, C. U.,Langlois, M.,Dohlen, K.,Vigan, A.,Pohl, A.,Carbillet, M.,Fantinel, D.,Maurel, D.,Origné, A.,Petit, C.,Ramos, J.,Rigal, F.,Sevin, A.,Boccaletti, A.,Le Coroller, H.,Dominik, C.,Henning, T.,Lagadec, E.,Ménard, F.,Turatto, M.,Udry, S.,Chauvin, G.,Feldt, M.,Beuzit, J.-L.,

Jan 2020
Astronomy & Astrophysics, Volume 633, id.A64, 26 pp.

340

Polarimetric imaging mode of VLT/SPHERE/IRDIS. I. Description, data reduction, and observing strategy

de Boer, J.,Langlois, M.,van Holstein, R. G.,Girard, J. H.,Mouillet, D.,Vigan, A.,Dohlen, K.,Snik, F.,Keller, C. U.,Ginski, C.,Stam, D. M.,Milli, J.,Wahhaj, Z.,Kasper, M.,Schmid, H. M.,Rabou, P.,Gluck, L.,Hugot, E.,Perret, D.,Martinez, P.,Weber, L.,Pragt, J.,Sauvage, J.-F.,Boccaletti, A.,Le Coroller, H.,Dominik, C.,Henning, T.,Lagadec, E.,Ménard, F.,Turatto, M.,Udry, S.,Chauvin, G.,Feldt, M.,Beuzit, J.-L.,

Jan 2020
Astronomy & Astrophysics, Volume 633, id.A63, 17 pp.

339

Overview of focal plane wavefront sensors to correct for the Low Wind Effect on SUBARU/SCExAO

Vievard, Sebastien,Bos, Steven,Cassaing, Frederic,Ceau, Alban,Guyon, Olivier,Jovanovic, Nemanja,Keller, Christoph U.,Lozi, Julien,Martinache, Frantz,Montmerle-Bonnefois, Aurelie,Mugnier, Laurent,NDiaye, Mamadou,Norris, Barnaby,Sahoo, Ananya,Sauvage, Jean-Francois,Snik, Frans,Wilby, Michael J.,Wong, Alisson,

Dec 2019
eprint arXiv:1912.10179

338

Focal-plane wavefront sensing with the vector-Apodizing Phase Plate

Bos, S. P.,Doelman, D. S.,Lozi, J.,Guyon, O.,Keller, C. U.,Miller, K. L.,Jovanovic, N.,Martinache, F.,Snik, F.,

Dec 2019
Astronomy & Astrophysics, Volume 632, id.A48, 19 pp.

337

Highly multiplexed Bragg gratings for large field of view gas sensing in planetary atmospheres

Haffert, S. Y.,Por, E. H.,Keller, C. U.,

Nov 2019
Optics Express, vol. 27, issue 23, p. 33925

336

Spatial linear dark field control and holographic modal wavefront sensing with a vAPP coronagraph on MagAO-X

Miller, Kelsey,Males, Jared R.,Guyon, Olivier,Close, Laird M.,Doelman, David,Snik, Frans,Por, Emiel,Wilby, Michael J.,Keller, Christoph,Bohlman, Chris,Van Gorkom, Kyle,Rodack, Alexander,Knight, Justin,Lumbres, Jennifer,Bos, Steven,Jovanovic, Nemanja,

Oct 2019
Journal of Astronomical Telescopes, Instruments, and Systems, Volume 5, id. 049004 (2019).

335

A snapshot full-Stokes spectropolarimeter for detecting life on Earth

Snik, Frans,Keller, Christoph U.,Doelman, David S.,Kühn, Jonas,Patty, C. H. Lucas,Hoeijmakers, H. Jens,Pallichadath, Vidhya,Stam, Daphne M.,Pommerol, Antoine,Poch, Olivier,Demory, Brice-Olivier,

Sep 2019
Proceedings of the SPIE, Volume 11132, id. 111320A 11 pp. (2019).

334

Insights into Terrestrial Planet Compositions and Geophysics from Observations of Magma Worlds

Ridden-Harper, Andrew,Snellen, Ignas,Keller, Christoph,Mollière, Paul,De Mooij, Ernst J. W.,Jayawardhana, Ray,de Kok, Remco,Hoeijmakers, H. Jens,Brogi, Matteo,Fridlund, Carl Malcolm,Vermeersen, Bert,Westrenen, Wim,

Aug 2019
American Astronomical Society, Extreme Solar Systems 4, id. 313.05. Bulletin of the American Astronomical Society, Vol. 51, No. 6

333

ESA Voyage 2050 White Paper: Detecting life outside our solar system with a large high-contrast-imaging mission

Snellen, Ignas,Albrecht, Simon,Anglada-Escude, Guillem,Baraffe, Isabelle,Baudoz, Pierre,Benz, Willy,Beuzit, Jean-Luc,Biller, Beth,Birkby, Jayne,Boccaletti, Anthony,van Boekel, Roy,de Boer, Jos,Brogi, Matteo,Buchhave, Lars,Carone, Ludmila,Claire, Mark,Claudi, Riccardo,Demory, Brice-Olivier,Desert, Jean-Michel,Desidera, Silvano,Gaudi, Scott,Gratton, Raffaele,Gillon, Michael,Grenfell, John Lee,Guyon, Olivier,Henning, Thomas,Hinkley, Sasha,Huby, Elsa,Janson, Markus,Helling, Christiane,Heng, Kevin,Kasper, Markus,Keller, Christoph,Kenworthy, Matthew,Krause, Oliver,Kreidberg, Laura,Madhusudhan, Nikku,Lagrange, Anne-Marie,Launhardt, Ralf,Lenton, Tim,Lopez-Puertas, Manuel,Maire, Anne-Lise,Mayne, Nathan,Meadows, Victoria,Mennesson, Bertrand,Micela, Giuseppina,Miguel, Yamila,Milli, Julien,Min, Michiel,de Mooij, Ernst,Mouillet, David,N'Diaye, Mamadou,D'Orazi, Valentina,Palle, Enric,Pagano, Isabella,Piotto, Giampaolo,Queloz, Didier,Rauer, Heike,Ribas, Ignasi,Ruane, Garreth,Selsis, Franck,Snik, Frans,Sozzetti, Alessandro,Stam, Daphne,Stark, Christopher,Vigan, Arthur,de Visser, Pieter,

Aug 2019
eprint arXiv:1908.01803

332

Search for gas from the disintegrating rocky exoplanet K2-22b

Ridden-Harper, A. R.,Snellen, I. A. G.,Keller, C. U.,Mollière, P.,

Aug 2019
Astronomy & Astrophysics, Volume 628, id.A70, 14 pp.

331

Polarimetric imaging of circumstellar disks. I. Artifacts due to limited angular resolution

Heikamp, S.,Keller, C. U.,

Jul 2019
Astronomy & Astrophysics, Volume 627, id.A156, 7 pp.

330

Two accreting protoplanets around the young star PDS 70

Haffert, S. Y.,Bohn, A. J.,de Boer, J.,Snellen, I. A. G.,Brinchmann, J.,Girard, J. H.,Keller, C. U.,Bacon, R.,

Jun 2019
Nature Astronomy, Volume 3, p. 749-754

329

Discovery of a directly imaged disk in scattered light around the Sco-Cen member Wray 15-788

Bohn, A. J.,Kenworthy, M. A.,Ginski, C.,Benisty, M.,de Boer, J.,Keller, C. U.,Mamajek, E. E.,Meshkat, T.,Muro-Arena, G. A.,Pecaut, M. J.,Snik, F.,Wolff, S. G.,Reggiani, M.,

Apr 2019
Astronomy & Astrophysics, Volume 624, id.A87, 15 pp.

328

SPHERE/ZIMPOL high resolution polarimetric imager. I. System overview, PSF parameters, coronagraphy, and polarimetry

Schmid, H. M.,Bazzon, A.,Roelfsema, R.,Mouillet, D.,Milli, J.,Menard, F.,Gisler, D.,Hunziker, S.,Pragt, J.,Dominik, C.,Boccaletti, A.,Ginski, C.,Abe, L.,Antoniucci, S.,Avenhaus, H.,Baruffolo, A.,Baudoz, P.,Beuzit, J. L.,Carbillet, M.,Chauvin, G.,Claudi, R.,Costille, A.,Daban, J.-B.,de Haan, M.,Desidera, S.,Dohlen, K.,Downing, M.,Elswijk, E.,Engler, N.,Feldt, M.,Fusco, T.,Girard, J. H.,Gratton, R.,Hanenburg, H.,Henning, Th.,Hubin, N.,Joos, F.,Kasper, M.,Keller, C. U.,Langlois, M.,Lagadec, E.,Martinez, P.,Mulder, E.,Pavlov, A.,Podio, L.,Puget, P.,Quanz, S. P.,Rigal, F.,Salasnich, B.,Sauvage, J.-F.,Schuil, M.,Siebenmorgen, R.,Sissa, E.,Snik, F.,Suarez, M.,Thalmann, Ch.,Turatto, M.,Udry, S.,van Duin, A.,van Holstein, R. G.,Vigan, A.,Wildi, F.,

Nov 2018
Astronomy & Astrophysics, Volume 619, id.A9, 37 pp.

327

Chromatic transit light curves of disintegrating rocky planets

Ridden-Harper, A. R.,Keller, C. U.,Min, M.,van Lieshout, R.,Snellen, I. A. G.,

Oct 2018
Astronomy & Astrophysics, Volume 618, id.A97, 18 pp.

326

First direct detection of a polarized companion outside a resolved circumbinary disk around CS Chamaeleonis

Ginski, C.,Benisty, M.,van Holstein, R. G.,Juhász, A.,Schmidt, T. O. B.,Chauvin, G.,de Boer, J.,Wilby, M.,Manara, C. F.,Delorme, P.,Ménard, F.,Pinilla, P.,Birnstiel, T.,Flock, M.,Keller, C.,Kenworthy, M.,Milli, J.,Olofsson, J.,Pérez, L.,Snik, F.,Vogt, N.,

Aug 2018
Astronomy & Astrophysics, Volume 616, id.A79, 18 pp.

325

Review of high-contrast imaging systems for current and future ground-based and space-based telescopes III: technology opportunities and pathways

Snik, Frans,Absil, Olivier,Baudoz, Pierre,Beaulieu, Mathilde,Bendek, Eduardo,Cady, Eric,Carlomagno, Brunella,Carlotti, Alexis,Cvetojevic, Nick,Doelman, David,Fogarty, Kevin,Galicher, Raphaël.,Guyon, Olivier,Haffert, Sebastiaan,Huby, Elsa,Jewell, Jeffrey,Jovanovic, Nemanja,Keller, Christoph,Kenworthy, Matthew A.,Knight, Justin,Kuhn, Jonas,Mazoyer, Johan,Miller, Kelsey,N'Diaye, Mamadou,Norris, Barnaby,Por, Emiel,Pueyo, Laurent,Riggs, A. J. Eldorado,Ruane, Garreth,Sirbu, Dan,Wallace, J. Kent,Wilby, Michael,Ygouf, Marie,

Jul 2018
Proceedings of the SPIE, Volume 10706, id. 107062L 15 pp. (2018).

324

Optimization of contrast in adaptive optics for exoplanet imaging

Radhakrishnan, Vikram Mark,Keller, Christoph U.,Doelman, Niek,

Jul 2018
Proceedings of the SPIE, Volume 10703, id. 107034N 7 pp. (2018).

323

On-sky results of the Leiden EXoplanet Instrument (LEXI)

Haffert, S. Y.,Wilby, M. J.,Keller, C. U.,Snellen, I. A. G.,Doelman, D. S.,Por, E. H.,van Kooten, M.,Bos, S. P.,Wardenier, J.,

Jul 2018
Proceedings of the SPIE, Volume 10703, id. 1070323 11 pp. (2018).

322

Review of high-contrast imaging systems for current and future ground-based and space-based telescopes: Part II. Common path wavefront sensing/control and coherent differential imaging

Jovanovic, Nemanja,Absil, Olivier,Baudoz, Pierre,Beaulieu, Mathilde,Bottom, Michael,Cady, Eric,Carlomagno, Brunella,Carlotti, Alexis,Doelman, David,Fogarty, Kevin,Galicher, Raphaël.,Guyon, Olivier,Haffert, Sebastiaan,Huby, Elsa,Jewell, Jeffrey,Keller, Christoph,Kenworthy, Matthew A.,Knight, Justin,Kühn, Jonas,Miller, Kelsey,Mazoyer, Johan,N'Diaye, Mamadou,Por, Emiel,Pueyo, Laurent,Riggs, A. J. E.,Ruane, Garreth,Sirbu, Dan,Snik, Frans,Wallace, J. K.,Wilby, Michael,Ygouf, Marie,

Jul 2018
Proceedings of the SPIE, Volume 10703, id. 107031U 18 pp. (2018).

321

MagAO-X: project status and first laboratory results

Males, Jared R.,Close, Laird M.,Miller, Kelsey,Schatz, Lauren,Doelman, David,Lumbres, Jennifer,Snik, Frans,Rodack, Alex,Knight, Justin,Van Gorkom, Kyle,Long, Joseph D.,Hedglen, Alex,Kautz, Maggie,Jovanovic, Nemanja,Morzinski, Katie,Guyon, Olivier,Douglas, Ewan,Follette, Katherine B.,Lozi, Julien,Bohlman, Chris,Durney, Olivier,Gasho, Victor,Hinz, Phil,Ireland, Michael,Jean, Madison,Keller, Christoph,Kenworthy, Matt,Mazin, Ben,Noenickx, Jamison,Alfred, Dan,Perez, Kevin,Sanchez, Anna,Sauve, Corwynn,Weinberger, Alycia,Conrad, Al,

Jul 2018
Proceedings of the SPIE, Volume 10703, id. 1070309 14 pp. (2018).

320

High contrast imaging for the enhanced resolution imager and spectrometer (ERIS)

Kenworthy, Matthew A.,Snik, Frans,Keller, Christoph U.,Doelman, David,Por, Emiel H.,Absil, Olivier,Carlomagno, Brunella,Karlsson, Mikael,Huby, Elsa,Glauser, Adrian M.,Quanz, Sascha P.,Taylor, William D.,

Jul 2018
Proceedings of the SPIE, Volume 10702, id. 1070246 8 pp. (2018).

319

ERIS: revitalising an adaptive optics instrument for the VLT

Davies, R.,Esposito, S.,Schmid, H.-M.,Taylor, W.,Agapito, G.,Agudo Berbel, A.,Baruffolo, A.,Biliotti, V.,Biller, B.,Black, M.,Boehle, A.,Briguglio, B.,Buron, A.,Carbonaro, L.,Cortes, A.,Cresci, G.,Deysenroth, M.,Di Cianno, A.,Di Rico, G.,Doelman, D.,Dolci, M.,Dorn, R.,Eisenhauer, F.,Fantinel, D.,Ferruzzi, D.,Feuchtgruber, H.,Förster Schreiber, N.,Gao, X.,Gemperlein, H.,Genzel, R.,George, E.,Gillessen, S.,Giordano, C.,Glauser, A.,Glindemann, A.,Grani, P.,Hartl, M.,Heijmans, J.,Henry, D.,Huber, H.,Kasper, M.,Keller, C.,Kenworthy, M.,Kühn, J.,Kuntschner, H.,Lightfoot, J.,Lunney, D.,MacIntosh, M.,Mannucci, F.,March, S.,Neeser, M.,Patapis, P.,Pearson, D.,Plattner, M.,Puglisi, A.,Quanz, S.,Rau, C.,Riccardi, A.,Salasnich, B.,Schubert, J.,Snik, F.,Sturm, E.,Valentini, A.,Waring, C.,Wiezorrek, E.,Xompero, M.,

Jul 2018
Proceedings of the SPIE, Volume 10702, id. 1070209 12 pp. (2018).

318

Multiplexed holographic aperture masking with liquid-crystal geometric phase masks

Doelman, D. S.,Tuthill, P.,Norris, B.,Wilby, M. J.,Por, E. H.,Keller, C. U.,Escuti, M. J.,Snik, F.,

Jul 2018
Proceedings of the SPIE, Volume 10701, id. 107010T 11 pp. (2018).

317

Review of high-contrast imaging systems for current and future ground- and space-based telescopes I: coronagraph design methods and optical performance metrics

Ruane, G.,Riggs, A.,Mazoyer, J.,Por, E. H.,N'Diaye, M.,Huby, E.,Baudoz, P.,Galicher, R.,Douglas, E.,Knight, J.,Carlomagno, B.,Fogarty, K.,Pueyo, L.,Zimmerman, N.,Absil, O.,Beaulieu, M.,Cady, E.,Carlotti, A.,Doelman, D.,Guyon, O.,Haffert, S.,Jewell, J.,Jovanovic, N.,Keller, C.,Kenworthy, M. A.,Kuhn, J.,Miller, K.,Sirbu, D.,Snik, F.,Wallace, J. Kent,Wilby, M.,Ygouf, M.,

Aug 2018
Proceedings of the SPIE, Volume 10698, id. 106982S 19 pp. (2018).

316

Laboratory verification of Fast & Furious phase diversity: Towards controlling the low wind effect in the SPHERE instrument

Wilby, M. J.,Keller, C. U.,Sauvage, J.-F.,Dohlen, K.,Fusco, T.,Mouillet, D.,Beuzit, J.-L.,

Jul 2018
Astronomy & Astrophysics, Volume 615, id.A34, 13 pp.

315

A Planet with a Disc? A Surprising Detection in Polarised Light with VLT/SPHERE

Ginski, C.,van Holstein, R.,Juhász, A.,Benisty, M.,Schmidt, T.,Chauvin, G.,de Boer, J.,Wilby, M.,Manara, C. F.,Delorme, P.,Ménard, F.,Muro-Arena, G.,Pinilla, P.,Birnstiel, T.,Flock, M.,Keller, C.,Kenworthy, M.,Milli, J.,Olofsson, J.,Pérez, L.,Snik, F.,Vogt, N.,

Jun 2018
The Messenger, vol. 172, p. 27-31

314

The Single-mode Complex Amplitude Refinement (SCAR) coronagraph: II. Lab verification, and toward the characterization of Proxima b

Haffert, S. Y.,Por, E. H.,Keller, C. U.,Kenworthy, M. A.,Doelman, D. S.,Snik, F.,Escuti, M. J.,

Mar 2018
eprint arXiv:1803.10693

313

Atmospheric Implications of Light Alkane Emissions From the U.S. Oil and Natural Gas Sector

Fischer, E. V.,Tzompa Sosa, Z. A.,Henderson, B.,Travis, K.,Keller, C.,Sive, B. C.,Helmig, D.,Fried, A.,Herndon, S. C.,Yacovitch, T. I.,Mahieu, E.,Franco, B.,

Dec 2017
American Geophysical Union, Fall Meeting 2017, abstract #A42E-07

312

The Spectropolarimeter for Planetary Exploration: SPEX

Laan, Erik,Stam, Daphne,Snik, Frans,Karalidi, Theodora,Keller, Christoph,ter Horst, Rik,Navarro, Ramon,Oomen, Gijsbert,de Vries, Johan,Hoogeveen, Ruud,

Nov 2017
Proceedings of the SPIE, Volume 10566, id. 105662G 7 pp. (2017).

311

SPEX: the Spectropolarimeter for Planetary Exploration

Rietjens, J. H. H.,Snik, F.,Stam, D. M.,Smit, J. M.,van Harten, G.,Keller, C. U.,Verlaan, A. L.,Laan, E. C.,ter Horst, R.,Navarro, R.,Wielinga, K.,Moon, S. G.,Voors, R.,

Nov 2017
Proceedings of the SPIE, Volume 10565, id. 105651C 7 pp. (2017).

310

SPEX: a highly accurate spectropolarimeter for atmospheric aerosol characterization

Rietjens, J. H. H.,Smit, J. M.,di Noia, A.,Hasekamp, O. P.,van Harten, G.,Snik, F.,Keller, C. U.,

Nov 2017
Proceedings of the SPIE, Volume 10563, id. 1056344 8 pp. (2017).

309

Polarization modeling and predictions for DKIST part 2: application of the Berreman calculus to spectral polarization fringes of beamsplitters and crystal retarders

Harrington, David M.,Snik, Frans,Keller, Christoph U.,Sueoka, Stacey R.,van Harten, Gerard,

Oct 2017
Journal of Astronomical Telescopes, Instruments, and Systems, Volume 3, id. 048001 (2017).

308

Combining angular differential imaging and accurate polarimetry with SPHERE/IRDIS to characterize young giant exoplanets

van Holstein, Rob G.,Snik, Frans,Girard, Julien H.,de Boer, Jozua,Ginski, C.,Keller, Christoph U.,Stam, Daphne M.,Beuzit, Jean-Luc,Mouillet, David,Kasper, Markus,Langlois, Maud,Zurlo, Alice,de Kok, Remco J.,Vigan, Arthur,

Sep 2017
Proceedings of the SPIE, Volume 10400, id. 1040015 16 pp. (2017).

307

Three Years of SPHERE: The Latest View of the Morphology and Evolution of Protoplanetary Discs

Garufi, A.,Benisty, M.,Stolker, T.,Avenhaus, H.,de Boer, J..,Pohl, A.,Quanz, S. P.,Dominik, C.,Ginski, C.,Thalmann, C.,van Boekel, R.,Boccaletti, A.,Henning, T.,Janson, M.,Salter, G.,Schmid, H. M.,Sissa, E.,Langlois, M.,Beuzit, J.-L.,Chauvin, G.,Mouillet, D.,Augereau, J.-C.,Bazzon, A.,Biller, B.,Bonnefoy, M.,Buenzli, E.,Cheetham, A.,Daemgen, S.,Desidera, S.,Engler, N.,Feldt, M.,Girard, J.,Gratton, R.,Hagelberg, J.,Keller, C.,Keppler, M.,Kenworthy, M.,Kral, Q.,Lopez, B.,Maire, A.-L.,Menard, F.,Mesa, D.,Messina, S.,Meyer, M. R.,Milli, J.,Min, M.,Muller, A.,Olofsson, J.,Pawellek, N.,Pinte, C.,Szulagyi, J.,Vigan, A.,Wahhaj, Z.,Waters, R.,Zurlo, A.,

Sep 2017
The Messenger, vol. 169, p. 32-37

306

Investigating circular patterns in linear polarization observations of Venus

Mahapatra, G.,Stam, D. M.,Rossi, L.,Rodenhuis, M.,Snik, F.,Keller, C. U.,

Sep 2017
European Planetary Science Congress 2017, held 17-22 September, 2017 in Riga Latvia, id. EPSC2017-885

305

Polarization modeling and predictions for DKIST part 2: application of the Berreman calculus to spectral polarization fringes of beamsplitters and crystal retarders

Harrington, David M.,Snik, Frans,Keller, Christoph U.,Sueoka, Stacey R.,van Harten, Gerard,

Aug 2017
Proceedings of the SPIE, Volume 10407, id. 104070A 22 pp. (2017).

304

Rigorous vector wave propagation for arbitrary flat media

Bos, Steven P.,Haffert, Sebastiaan Y.,Keller, Christoph U.,

Aug 2017
Proceedings of the SPIE, Volume 10407, id. 1040709 19 pp. (2017).

303

BP Piscium: its flaring disc imaged with SPHERE/ZIMPOL★

de Boer, J.,Girard, J. H.,Canovas, H.,Min, M.,Sitko, M.,Ginski, C.,Jeffers, S. V.,Mawet, D.,Milli, J.,Rodenhuis, M.,Snik, F.,Keller, C. U.,

Mar 2017
Monthly Notices of the Royal Astronomical Society: Letters, Volume 466, Issue 1, p.L7-L12

302

On-sky Performance Analysis of the Vector Apodizing Phase Plate Coronagraph on MagAO/Clio2

Otten, Gilles P. P. L.,Snik, Frans,Kenworthy, Matthew A.,Keller, Christoph U.,Males, Jared R.,Morzinski, Katie M.,Close, Laird M.,Codona, Johanan L.,Hinz, Philip M.,Hornburg, Kathryn J.,Brickson, Leandra L.,Escuti, Michael J.,

Jan 2017
The Astrophysical Journal, Volume 834, Issue 2, article id. 175, 11 pp. (2017).

301

The coronagraphic Modal Wavefront Sensor: a hybrid focal-plane sensor for the high-contrast imaging of circumstellar environments

Wilby, M. J.,Keller, C. U.,Snik, F.,Korkiakoski, V.,Pietrow, A. G. M.,

Jan 2017
Astronomy & Astrophysics, Volume 597, id.A112, 14 pp.

300

The SPEX-airborne multi-angle spectropolarimeter on NASA's ER-2 research aircraft: capabilities, data processing and data products

Rietjens, J.,Smit, M.,Hasekamp, O. P.,Grim, M.,Eggens, M.,Eigenraam, A.,Keizer, G.,van Loon, D.,Talsma, J.,van der Vlugt, J.,Wolfs, R.,van Harten, G.,Rheingans, B. E.,Snik, F.,Keller, C. U.,Smit, H.,

Dec 2016
American Geophysical Union, Fall Meeting 2016, abstract #A51B-0022

299

Dusty tails of evaporating exoplanets. II. Physical modelling of the KIC 12557548b light curve

van Lieshout, R.,Min, M.,Dominik, C.,Brogi, M.,de Graaff, T.,Hekker, S.,Kama, M.,Keller, C. U.,Ridden-Harper, A.,van Werkhoven, T. I. M.,

Nov 2016
Astronomy & Astrophysics, Volume 596, id.A32, 18 pp.

298

Multiple rings in the transition disk and companion candidates around RX J1615.3-3255. High contrast imaging with VLT/SPHERE

de Boer, J.,Salter, G.,Benisty, M.,Vigan, A.,Boccaletti, A.,Pinilla, P.,Ginski, C.,Juhasz, A.,Maire, A.-L.,Messina, S.,Desidera, S.,Cheetham, A.,Girard, J. H.,Wahhaj, Z.,Langlois, M.,Bonnefoy, M.,Beuzit, J.-L.,Buenzli, E.,Chauvin, G.,Dominik, C.,Feldt, M.,Gratton, R.,Hagelberg, J.,Isella, A.,Janson, M.,Keller, C. U.,Lagrange, A.-M.,Lannier, J.,Menard, F.,Mesa, D.,Mouillet, D.,Mugrauer, M.,Peretti, S.,Perrot, C.,Sissa, E.,Snik, F.,Vogt, N.,Zurlo, A.,SPHERE Consortium,

Nov 2016
Astronomy & Astrophysics, Volume 595, id.A114, 16 pp.

297

Direct detection of scattered light gaps in the transitional disk around HD 97048 with VLT/SPHERE

Ginski, C.,Stolker, T.,Pinilla, P.,Dominik, C.,Boccaletti, A.,de Boer, J.,Benisty, M.,Biller, B.,Feldt, M.,Garufi, A.,Keller, C. U.,Kenworthy, M.,Maire, A. L.,Ménard, F.,Mesa, D.,Milli, J.,Min, M.,Pinte, C.,Quanz, S. P.,van Boekel, R.,Bonnefoy, M.,Chauvin, G.,Desidera, S.,Gratton, R.,Girard, J. H. V.,Keppler, M.,Kopytova, T.,Lagrange, A.-M.,Langlois, M.,Rouan, D.,Vigan, A.,

Nov 2016
Astronomy & Astrophysics, Volume 595, id.A112, 11 pp.

296

The Hera Saturn entry probe mission

Mousis, O.,Atkinson, D. H.,Spilker, T.,Venkatapathy, E.,Poncy, J.,Frampton, R.,Coustenis, A.,Reh, K.,Lebreton, J.-P.,Fletcher, L. N.,Hueso, R.,Amato, M. J.,Colaprete, A.,Ferri, F.,Stam, D.,Wurz, P.,Atreya, S.,Aslam, S.,Banfield, D. J.,Calcutt, S.,Fischer, G.,Holland, A.,Keller, C.,Kessler, E.,Leese, M.,Levacher, P.,Morse, A.,Muñoz, O.,Renard, J.-B.,Sheridan, S.,Schmider, F.-X.,Snik, F.,Waite, J. H.,Bird, M.,Cavalié, T.,Deleuil, M.,Fortney, J.,Gautier, D.,Guillot, T.,Lunine, J. I.,Marty, B.,Nixon, C.,Orton, G. S.,Sánchez-Lavega, A.,

Oct 2016
Planetary and Space Science, Volume 130, p. 80-103.

295

HERA: an atmospheric probe to unveil the depths of Saturn

Mousis, Olivier,Atkinson, David H.,Amato, Michael,Aslam, Shahid,Atreya, Sushil K.,Blanc, Michel,Bolton, Scott J.,Brugger, Bastien,Calcutt, Simon,Cavalié, Thibault,Charnoz, Sébastien,Coustenis, Athena,DELEUIL, Magali,Ferri, Francesca,Fletcher, Leigh N.,Guillot, Tristan,Hartogh, Paul,Holland, Andrew,Hueso, Ricardo,Keller, Christoph,Kessler, Ernst,Lebreton, Jean-Pierre,leese, Mark,Lellouch, Emmanuel,Levacher, Patrick,Marty, Bernard,Morse, Andrew,Nixon, Conor,Reh, Kim R.,Renard, Jean-Baptiste,Sanchez-Lavega, Agustin,Schmider, François-Xavier,Sheridan, Simon,Simon, Amy A.,Snik, Frans,Spilker, Thomas R.,Stam, Daphne M.,Venkatapathy, Ethiraj,Vernazza, Pierre,Waite, J. Hunter,Wurz, Peter,

Oct 2016
American Astronomical Society, DPS meeting #48, id.123.28

294

Search for an exosphere in sodium and calcium in the transmission spectrum of exoplanet 55 Cancri e

Ridden-Harper, A. R.,Snellen, I. A. G.,Keller, C. U.,de Kok, R. J.,Di Gloria, E.,Hoeijmakers, H. J.,Brogi, M.,Fridlund, M.,Vermeersen, B. L. A.,van Westrenen, W.,

Oct 2016
Astronomy & Astrophysics, Volume 593, id.A129, 13 pp.

293

Design trade-off and proof of concept for LOUPE, the Lunar Observatory for Unresolved Polarimetry of Earth

Hoeijmakers, H. J.,Arts, M. L. J.,Snik, F.,Keller, C. U.,Stam, D. M.,Kuiper, J. M.,

Sep 2016
Optics Express, vol. 24, issue 19, p. 21435

292

Novel instrument concepts for characterizing directly imaged exoplanets

Keller, Christoph U.,

Aug 2016
Proceedings of the SPIE, Volume 9908, id. 99089V 9 pp. (2016).

291

The Leiden EXoplanet Instrument (LEXI): a high-contrast high-dispersion spectrograph

Haffert, S. Y.,Wilby, M. J.,Keller, C. U.,Snellen, I. A. G.,

Aug 2016
Proceedings of the SPIE, Volume 9908, id. 990867 8 pp. (2016).

290

End-to-end simulations of the E-ELT/METIS coronagraphs

Carlomagno, Brunella,Absil, Olivier,Kenworthy, Matthew,Ruane, Garreth,Keller, Christoph U.,Otten, Gilles,Feldt, Markus,Hippler, Stefan,Huby, Elsa,Mawet, Dimitri,Delacroix, Christian,Surdej, Jean,Habraken, Serge,Forsberg, Pontus,Karlsson, Mikael,Vargas Catalan, Ernesto,Brandl, Bernhard R.,

Jul 2016
Proceedings of the SPIE, Volume 9909, id. 990973 10 pp. (2016).

289

A "Fast and Furious'" solution to the low-wind effect for SPHERE at the VLT

Wilby, M. J.,Keller, C. U.,Sauvage, J.-F.,Fusco, T.,Mouillet, D.,Beuzit, J.-L.,Dohlen, K.,

Jul 2016
Proceedings of the SPIE, Volume 9909, id. 99096C 12 pp. (2016).

288

Focal-plane electric field sensing with pupil-plane holograms

Por, Emiel H.,Keller, Christoph U.,

Jul 2016
Proceedings of the SPIE, Volume 9909, id. 990959 17 pp. (2016).

287

The ZIMPOL high contrast imaging polarimeter for SPHERE: polarimetric high contrast commissioning results

Roelfsema, Ronald,Bazzon, Andreas,Schmid, Hans Martin,Pragt, Johan,Govaert, Alain,Gisler, Daniel,Dominik, Carsten,Baruffolo, Andrea,Beuzit, Jean-Luc,Costille, Anne,Dohlen, Kjetil,Downing, Mark,Elswijk, Eddy,de Haan, Menno,Hubin, Norbert,Kasper, Markus,Keller, Christoph,Lizon, Jean-Louis,Mouillet, David,Pavlov, Alexey,Puget, Pascal,Salasnich, Bernardo,Sauvage, Jean-Francois,Wildi, Francois,

Jul 2016
Proceedings of the SPIE, Volume 9909, id. 990927 18 pp. (2016).

286

Designing and testing the coronagraphic Modal Wavefront Sensor: a fast non-common path error sensor for high-contrast imaging

Wilby, M. J.,Keller, C. U.,Haffert, S.,Korkiakoski, V.,Snik, F.,Pietrow, A. G. M.,

Jul 2016
Proceedings of the SPIE, Volume 9909, id. 990921 11 pp. (2016).

285

FlySPEX: a flexible multi-angle spectropolarimetric sensing system

Snik, Frans,Keller, Christoph U.,Wijnen, Merijn,Peters, Hubert,Derks, Roy,Smulders, Edwin,

May 2016
Proceedings of the SPIE, Volume 9853, id. 985308 11 pp. (2016).

284

Accurate spectrally modulating polarimeters for atmospheric aerosol characterization

Rietjens, Jeroen H. H.,Smit, Martijn,van Harten, Gerard,Di Noia, Antonio,Hasekamp, Otto P.,de Boer, Jos,Volten, Hester,Snik, Frans,Keller, Christoph U.,

Sep 2015
Proceedings of the SPIE, Volume 9613, id. 96130S 7 pp. (2015).

283

Instrumemtation

Keller, Christoph U.,Snik, Frans,Harrington, David M.,Packham, Chris,

May 2015
Polarimetry of Stars and Planetary Systems, Edited by L. Kolokolova, J. Hough, and A. Levasseur-Regourd. ISBN: 978-1-107-04390-9. Cambridge University Press, 2015, p.35

282

Combining high-dispersion spectroscopy with high contrast imaging: Probing rocky planets around our nearest neighbors

Snellen, I.,de Kok, R.,Birkby, J. L.,Brandl, B.,Brogi, M.,Keller, C.,Kenworthy, M.,Schwarz, H.,Stuik, R.,

Apr 2015
Astronomy & Astrophysics, Volume 576, id.A59, 9 pp.

281

Magnetic field topology and chemical spot distributions in the extreme Ap star HD 75049

Kochukhov, O.,Rusomarov, N.,Valenti, J. A.,Stempels, H. C.,Snik, F.,Rodenhuis, M.,Piskunov, N.,Makaganiuk, V.,Keller, C. U.,Johns-Krull, C. M.,

Feb 2015
Astronomy & Astrophysics, Volume 574, id.A79, 12 pp.

280

Use of neural networks in ground-based aerosol retrievals from multi-angle spectropolarimetric observations

Di Noia, A.,Hasekamp, O. P.,van Harten, G.,Rietjens, J. H. H.,Smit, J. M.,Snik, F.,Henzing, J. S.,de Boer, J.,Keller, C. U.,Volten, H.,

Jan 2015
Atmospheric Measurement Techniques, Volume 8, Issue 1, 2015, pp.281-299

279

Atmospheric aerosol characterization with a ground-based SPEX spectropolarimetric instrument

van Harten, G.,de Boer, J.,Rietjens, J. H. H.,Di Noia, A.,Snik, F.,Volten, H.,Smit, J. M.,Hasekamp, O. P.,Henzing, J. S.,Keller, C. U.,

Dec 2014
Atmospheric Measurement Techniques, Volume 7, Issue 12, 2014, pp.4341-4351

278

Surprising detection of an equatorial dust lane on the AGB star IRC+10216

Jeffers, S. V.,Min, M.,Waters, L. B. F. M.,Canovas, H.,Pols, O. R.,Rodenhuis, M.,de Juan Ovelar, M.,Keller, C. U.,Decin, L.,

Dec 2014
Astronomy & Astrophysics, Volume 572, id.A3, 8 pp.

277

Mapping atmospheric aerosols with a citizen science network of smartphone spectropolarimeters

Snik, Frans,Rietjens, Jeroen H. H.,Apituley, Arnoud,Volten, Hester,Mijling, Bas,Di Noia, Antonio,Heikamp, Stephanie,Heinsbroek, Ritse C.,Hasekamp, Otto P.,Smit, J. Martijn,Vonk, Jan,Stam, Daphne M.,Harten, Gerard,Boer, Jozua,Keller, Christoph U.,

Oct 2014
Geophysical Research Letters, Volume 41, Issue 20, pp. 7351-7358

276

Use of neural networks in ground-based aerosol retrievals from multi-angle spectropolarimetric observations

Di Noia, A.,Hasekamp, O. P.,van Harten, G.,Rietjens, J. H. H.,Smit, J. M.,Snik, F.,Henzing, J. S.,de Boer, J.,Keller, C. U.,Volten, H.,

Sep 2014
Atmospheric Measurement Techniques Discussions, Volume 7, Issue 9, 2014, pp.9047-9094

275

Focal-plane wavefront sensing with high-order adaptive optics systems

Korkiakoski, Visa,Keller, Christoph U.,Doelman, Niek,Kenworthy, Matthew,Otten, Gilles,Verhaegen, Michel,

Aug 2014
Proceedings of the SPIE, Volume 9148, id. 91485D 11 pp. (2014).

274

Drift scanning technique for mid-infrared background subtraction

Heikamp, Stephanie,Brandl, Bernhard R.,Keller, Christoph U.,Venema, Lars,Pantin, Eric,Siebenmorgen, Ralf,Ives, Derek,Kerber, Florian,

Aug 2014
Proceedings of the SPIE, Volume 9147, id. 91479T 6 pp. (2014).

273

Characterizing instrumental effects on polarization at a Nasmyth focus using NaCo

de Boer, Jozua,Girard, Julien H.,Mawet, Dimitri,Snik, Frans,Keller, Christoph U.,Milli, Julien,

Jul 2014
Proceedings of the SPIE, Volume 9147, id. 914787 15 pp. (2014).

272

The ZIMPOL high contrast imaging polarimeter for SPHERE: system test results

Roelfsema, Ronald,Bazzon, Andreas,Schmid, Hans Martin,Pragt, Johan,Gisler, Daniel,Dominik, Carsten,Baruffolo, Andrea,Beuzit, Jean-Luc,Costille, Anne,Dohlen, Kjetil,Downing, Mark,Elswijk, Eddy,de Haan, Menno,Hubin, Norbert,Kasper, Markus,Keller, Christoph,Lizon, Jean-Louis,Mouillet, David,Pavlov, Alexey,Puget, Pascal,Salasnich, Bernardo,Sauvage, Jean-Francois,Wildi, Francois,

Jul 2014
Proceedings of the SPIE, Volume 9147, id. 91473W 18 pp. (2014).

271

Fast & Furious focal-plane wavefront sensing

Korkiakoski, Visa,Keller, Christoph U.,Doelman, Niek,Kenworthy, Matthew,Otten, Gilles,Verhaegen, Michel,

Jul 2014
Applied Optics, vol. 53, issue 20, p. 4565

270

Spectral line polarimetry with a channeled polarimeter

van Harten, Gerard,Snik, Frans,Rietjens, Jeroen H. H.,Martijn Smit, J.,Keller, Christoph U.,

Jul 2014
Applied Optics, vol. 53, issue 19, p. 4187

269

Optimization-based wavefront sensorless adaptive optics for multiphoton microscopy

Antonello, Jacopo,van Werkhoven, Tim,Verhaegen, Michel,Truong, Hoa H.,Keller, Christoph U.,Gerritsen, Hans C.,

Jun 2014
Journal of the Optical Society of America A, vol. 31, issue 6, p. 1337

268

Atmospheric aerosol characterization with a ground-based SPEX spectropolarimetric instrument

van Harten, G.,de Boer, J.,Rietjens, J. H. H.,Di Noia, A.,Snik, F.,Volten, H.,Smit, J. M.,Hasekamp, O. P.,Henzing, J. S.,Keller, C. U.,

Jun 2014
Atmospheric Measurement Techniques Discussions, Volume 7, Issue 6, 2014, pp.5741-5768

267

Five-dimensional optical instrumentation: combining polarimetry with time-resolved integral-field spectroscopy

Rodenhuis, M.,Snik, F.,van Harten, G.,Hoeijmakers, J.,Keller, C. U.,

May 2014
Proceedings of the SPIE, Volume 9099, id. 90990L 16 pp. (2014).

266

Snapshot coherence-gated direct wavefront sensing for multi-photon microscopy

van Werkhoven, T. I. M.,Antonello, J.,Truong, H. H.,Verhaegen, M.,Gerritsen, H. C.,Keller, C. U.,

Apr 2014
Optics Express, vol. 22, issue 8, p. 9715

265

LOUPE: Spectropolarimetry of the Earth from the surface of the Moon

Hoeijmakers, H. J.,Snik, F.,Stam, D. M.,Keller, C. U.,

Apr 2014
European Planetary Science Congress 2014, EPSC Abstracts, Vol. 9, id. EPSC2014-574

264

Towards Polarimetric Exoplanet Imaging with ELTs

Keller, C. U.,Korkiakoski, V.,Rodenhuis, M.,Snik, F.,

Mar 2014
Search for Life Beyond the Solar System. Exoplanets, Biosignatures & Instruments. Online at https://astrobiology.nasa.gov/nai/seminars/featured-seminar-channels/conferences-and-workshops/2014/3/16/search-for-life-beyond-the-solar-system-conference/index.html, id.4.6

263

Instrumental polarisation at the Nasmyth focus of the E-ELT

de Juan Ovelar, M.,Snik, F.,Keller, C. U.,Venema, L.,

Feb 2014
Astronomy & Astrophysics, Volume 562, id.A8, 8 pp.

262

Imaging the circumstellar environment of the young T Tauri star SU Aurigae

Jeffers, S. V.,Min, M.,Canovas, H.,Rodenhuis, M.,Keller, C. U.,

Jan 2014
Astronomy & Astrophysics, Volume 561, id.A23, 9 pp.

261

Analysis and interpretation of 15 quarters of Kepler data of the disintegrating planet KIC 12557548 b

van Werkhoven, T. I. M.,Brogi, M.,Snellen, I. A. G.,Keller, C. U.,

Jan 2014
Astronomy & Astrophysics, Volume 561, id.A3, 9 pp.

260

Crowdsourced aerosol measurements using smartphone spectropolarimeters

Rietjens, J.,Snik, F.,Keller, C. U.,Heinsbroek, R.,van Harten, G.,Heikamp, S.,de Boer, J.,Zeegers, E.,Einarsen, L.,Hasekamp, O.,Smit, M.,di Noia, A.,Apituley, A.,Mijling, B.,Hendriks, E.,Stammes, P.,Volten, H.,Vonk, J.,Berkhout, S.,Haaima, M.,van der Hoff, R.,Stam, D.,Navarro, R.,Bettonvil, F.,

Dec 2013
American Geophysical Union, Fall Meeting 2013, abstract id. A21F-0122

259

Remote sensing of atmospheric aerosols with the SPEX spectropolarimeter

van Harten, G.,Rietjens, J.,Smit, M.,Snik, F.,Keller, C. U.,di Noia, A.,Hasekamp, O.,Vonk, J.,Volten, H.,

Dec 2013
American Geophysical Union, Fall Meeting 2013, abstract id. A21F-0121

258

Calibrating a high-resolution wavefront corrector with a static focal-plane camera

Korkiakoski, Visa,Doelman, Niek,Codona, Johanan,Kenworthy, Matthew,Otten, Gilles,Keller, Christoph U.,

Nov 2013
Applied Optics, vol. 52, issue 31, p. 7554

257

Iterative linear focal-plane wavefront correction

Smith, C. S.,Marinică, R.,den Dekker, A. J.,Verhaegen, M.,Korkiakoski, V.,Keller, C. U.,Doelman, N.,

Oct 2013
Journal of the Optical Society of America A, vol. 30, issue 10, p. 2002

256

Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712 . I. Spectropolarimetric observations in all four Stokes parameters

Rusomarov, N.,Kochukhov, O.,Piskunov, N.,Jeffers, S. V.,Johns-Krull, C. M.,Keller, C. U.,Makaganiuk, V.,Rodenhuis, M.,Snik, F.,Stempels, H. C.,Valenti, J. A.,

Oct 2013
Astronomy & Astrophysics, Volume 558, id.A8, 16 pp.

255

SPHERE-ZIMPOL system testing: status report on polarimetric high contrast results

Roelfsema, Ronald,Gisler, Daniel,Pragt, Johan,Schmid, Hans Martin,Bazzon, Andreas,Dominik, Carsten,Baruffolo, Andrea,Boccaletti, Anthonoy,Beuzit, Jean-Luc,Costille, Anne,Dohlen, Kjetil,Downing, Mark,Elswijk, Eddy,de Haan, Menno,Hubin, Norbert,Kasper, Markus,Keller, Christoph,Kenworthy, Matthew,Lizon, Jean-Louis,Martinez, Patrice,Mouillet, David,Pavlov, Alexey,Puget, Pascal,Salasnich, Bernardo,Sauvage, Jean-Francois,Thalmann, Christian,Wildi, Francois,

Sep 2013
Proceedings of the SPIE, Volume 8864, id. 88640C 20 pp. (2013).

254

Are there tangled magnetic fields on HgMn stars?

Kochukhov, O.,Makaganiuk, V.,Piskunov, N.,Jeffers, S. V.,Johns-Krull, C. M.,Keller, C. U.,Rodenhuis, M.,Snik, F.,Stempels, H. C.,Valenti, J. A.,

Jun 2013
Astronomy & Astrophysics, Volume 554, id.A61, 12 pp.

253

The color dependent morphology of the post-AGB star HD 161796

Min, M.,Jeffers, S. V.,Canovas, H.,Rodenhuis, M.,Keller, C. U.,Waters, L. B. F. M.,

Jun 2013
Astronomy & Astrophysics, Volume 554, id.A15, 10 pp.

252

Magnetically Controlled Accretion on the Classical T Tauri Stars GQ Lupi and TW Hydrae

Johns-Krull, Christopher M.,Chen, Wei,Valenti, Jeff A.,Jeffers, Sandra V.,Piskunov, Nikolai E.,Kochukhov, Oleg,Makaganiuk, V.,Stempels, H. C.,Snik, Frans,Keller, Christoph,Rodenhuis, M.,

Mar 2013
The Astrophysical Journal, Volume 765, Issue 1, article id. 11, 11 pp. (2013).

251

Observing Circumstellar Neighbourhoods with the Extreme Polarimeter

Rodenhuis, M.,Canovas, H.,Jeffers, S. V.,Min, M.,Keller, C. U.,

Jan 2013
370 Years of Astronomy in Utrecht. Proceedings of a conference held 2-5 April, 2012 at Hotel Leeuwenhorst, Noordwijkerhout, The Netherlands. ASP Conference Series, Vol. 470. San Francisco: Astronomical Society of the Pacific, 2013., p.407

250

Sterrekundig Instituut Utrecht: The Last Years

Keller, C. U.,

249

HARPS Spectropolarimetry of the Classical T Tauri Stars GQ Lup and TW Hya

Johns-Krull, Christopher M.,Chen, W.,Valenti, J. A.,Jeffers, S. V.,Piskunov, N. E.,Kochukhov, O.,Makaganiuk, V.,Stempels, H. C.,Snik, F.,Keller, C.,Rodenhuis, M.,

Jan 2013
American Astronomical Society, AAS Meeting #221, id.256.14

248

Astronomical Polarimetry: Polarized Views of Stars and Planets

Snik, Frans,Keller, Christoph U.,

n/a 2013
Planets, Stars and Stellar Systems, by Oswalt, Terry D.; Bond, Howard E., ISBN 978-94-007-5617-5. Springer Science+Business Media Dordrecht, 2013, p. 175

247

Observing the Earth as an exoplanet with LOUPE, the lunar observatory for unresolved polarimetry of Earth

Karalidi, T.,Stam, D. M.,Snik, F.,Bagnulo, S.,Sparks, W. B.,Keller, C. U.,

Dec 2012
Planetary and Space Science, Volume 74, Issue 1, p. 202-207.

246

Semidefinite programming for model-based sensorless adaptive optics

Antonello, Jacopo,Verhaegen, Michel,Fraanje, Rufus,van Werkhoven, Tim,Gerritsen, Hans C.,Keller, Christoph U.,

Nov 2012
Journal of the Optical Society of America A, vol. 29, issue 11, p. 2428

245

Unusual Stokes V profiles during flaring activity of a delta sunspot

Fischer, C. E.,Keller, C. U.,Snik, F.,Fletcher, L.,Socas-Navarro, H.,

Nov 2012
Astronomy & Astrophysics, Volume 547, id.A34, 12 pp.

244

SPICES: spectro-polarimetric imaging and characterization of exoplanetary systems. From planetary disks to nearby Super Earths

Boccaletti, Anthony,Schneider, Jean,Traub, Wes,Lagage, Pierre-Olivier,Stam, Daphne,Gratton, Raffaele,Trauger, John,Cahoy, Kerri,Snik, Frans,Baudoz, Pierre,Galicher, Raphael,Reess, Jean-Michel,Mawet, Dimitri,Augereau, Jean-Charles,Patience, Jenny,Kuchner, Marc,Wyatt, Mark,Pantin, Eric,Maire, Anne-Lise,Vérinaud, Christophe,Ronayette, Samuel,Dubreuil, Didier,Min, Michiel,Rodenhuis, Michiel,Mesa, Dino,Belikov, Russ,Guyon, Olivier,Tamura, Motohide,Murakami, Naoshi,Beerer, Ingrid Mary,SPICES Team,Mas, M.,Rouan, D.,Perrin, G.,Lacour, S.,Thébault, P.,Nguyen, N.,Ibgui, L.,Arenou, F.,Lestrade, J. F.,N'Diaye, M.,Dohlen, K.,Ferrari, M.,Hugot, E.,Beuzit, J.-L.,Lagrange, A.-M.,Martinez, P.,Barthelemey, M.,Mugnier, L.,Keller, C.,Marley, M.,Kalas, P.,Stapelfeldt, K.,Brown, R.,Kane, S.,Desidera, S.,Sozzetti, A.,Mura, A.,Martin, E. L.,Bouy, H.,Allan, A.,King, R.,Vigan, A.,Churcher, L.,Udry, S.,Matsuo, T.,Nishikawa, J.,Hanot, C.,Wolf, S.,Kaltenegger, L.,Klahr, H.,Pilat-Lohinger, E.,

Oct 2012
Experimental Astronomy, Volume 34, Issue 2, pp.355-384

243

Potential of phase-diversity for metrology of active instruments

Korkiakoski, Visa,Venema, Lars,Agocs, Tibor,Keller, Christoph U.,Doelman, Niek,Fraanje, Rufus,Andrei, Raluca,Verhaegen, Michel,

Sep 2012
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II. Proceedings of the SPIE, Volume 8450, article id. 84505D, 11 pp. (2012).

242

Modeling the instrumental polarization of the VLT and E-ELT telescopes with the M&m's code

de Juan Ovelar, M.,Diamantopoulou, S.,Roelfsema, R.,van Werkhoven, T.,Snik, F.,Pragt, Johan,Keller, C.,

Sep 2012
Modeling, Systems Engineering, and Project Management for Astronomy V. Proceedings of the SPIE, Volume 8449, article id. 844912, 13 pp. (2012).

241

A spectro-polarimetric integral field spectrograph for EPICS-EPOL

Rodenhuis, M.,Sprenger, B.,Keller, C. U.,

Sep 2012
Ground-based and Airborne Instrumentation for Astronomy IV. Proceedings of the SPIE, Volume 8446, article id. 84469J, 6 pp. (2012).

240

The extreme polarimeter: design, performance, first results and upgrades

Rodenhuis, M.,Canovas, H.,Jeffers, S. V.,de Juan Ovelar, Maria,Min, M.,Homs, L.,Keller, C. U.,

Sep 2012
Ground-based and Airborne Instrumentation for Astronomy IV. Proceedings of the SPIE, Volume 8446, article id. 84469I, 18 pp. (2012).

239

Searching for signs of habitability with LOUPE, the Lunar Observatory of Unresolved Polarimetry of Earth

Karalidi, T.,Stam, D. M.,Snik, F.,Bagnulo, S.,Sparks, W. B.,Keller, C. U.,

Sep 2012
European Planetary Science Congress 2012, held 23-28 September, 2012 in Madrid, Spain. http://meetings.copernicus.org/epsc2012, id. EPSC2012-537

238

Evidence for the disintegration of KIC 12557548 b

Brogi, M.,Keller, C. U.,de Juan Ovelar, M.,Kenworthy, M. A.,de Kok, R. J.,Min, M.,Snellen, I. A. G.,

Sep 2012
Astronomy & Astrophysics, Volume 545, id.L5, 4 pp.

237

Linear analytical solution to the phase diversity problem for extended objects based on the Born approximation

Andrei, Raluca M.,Smith, Carlas S.,Fraanje, Rufus,Verhaegen, Michel,Korkiakoski, Visa A.,Keller, Christoph U.,Doelman, Niek,

Jul 2012
Adaptive Optics Systems III. Proceedings of the SPIE, Volume 8447, article id. 84476U, 10 pp. (2012).

236

Bilinear solution to the phase diversity problem for extended objects based on the Born approximation

Andrei, Raluca M.,Fraanje, Rufus,Verhaegen, Michel,Korkiakoski, Visa A.,Keller, Christoph U.,Doelman, Niek,

Jul 2012
Adaptive Optics Systems III. Proceedings of the SPIE, Volume 8447, article id. 84476T, 11 pp. (2012).

235

Experimental validation of optimization concepts for focal-plane image processing with adaptive optics

Korkiakoski, Visa,Keller, Christoph U.,Doelman, Niek,Fraanje, Rufus,Andrei, Raluca,Verhaegen, Michel,

Jul 2012
Adaptive Optics Systems III. Proceedings of the SPIE, Volume 8447, article id. 84475Z, 11 pp. (2012).

234

FOAM: the modular adaptive optics framework

van Werkhoven, T. I. M.,Homs, L.,Sliepen, G.,Rodenhuis, M.,Keller, C. U.,

Jul 2012
Adaptive Optics Systems III. Proceedings of the SPIE, Volume 8447, article id. 84472V, 7 pp. (2012).

233

Extremely fast focal-plane wavefront sensing for extreme adaptive optics

Keller, Christoph U.,Korkiakoski, Visa,Doelman, Niek,Fraanje, Rufus,Andrei, Raluca,Verhaegen, Michel,

Jul 2012
Adaptive Optics Systems III. Proceedings of the SPIE, Volume 8447, article id. 844721, 10 pp. (2012).

232

Constraining the circumbinary envelope of Z Canis Majoris via imaging polarimetry

Canovas, H.,Min, M.,Jeffers, S. V.,Rodenhuis, M.,Keller, C. U.,

Jul 2012
Astronomy & Astrophysics, Volume 543, id.A70, 8 pp.

231

Data driven identification and aberration correction for model-based sensorless adaptive optics

Antonello, J.,Fraanje, R.,Song, H.,Verhaegen, M.,Gerritsen, H.,Keller, C. U.,van Werkhoven, T.,

Jun 2012
Proceedings of the SPIE, Volume 8436, id. 84360S (2012).

230

HARPS spectropolarimetry of classical T Tauri stars

Johns-Krull, C. M.,Valenti, J. A.,Jeffers, S. V.,Piskunov, N. E.,Kochukhov, O.,Keller, C.,Snik, F.,Rodenhuis, M.,Makaganiuk, V.,Stempels, H.,

May 2012
STELLAR POLARIMETRY: FROM BIRTH TO DEATH. AIP Conference Proceedings, Volume 1429, pp. 43-46 (2012).

229

SPEX2Earth, a novel spectropolarimeter for remote sensing of aerosols and clouds

Smit, J. M.,Rietjens, J. H. H.,Hasekamp, O.,Stam, D. M.,Snik, F.,van Harten, G.,Keller, C. U.,van der Togt, O.,Verlaan, A. L.,Moddemeijer, K.,Beijersbergen, M.,Voors, R.,Wielinga, K.,Vollmuller, B.-J.,

Apr 2012
EGU General Assembly 2012, held 22-27 April, 2012 in Vienna, Austria., p.14166

228

iSPEX: everybody can measure atmospheric aerosols with a smartphone spectropolarimeter

Snik, F.,Heikamp, S.,de Boer, J.,Keller, C. U.,van Harten, G.,Smit, J. M.,Rietjens, J. H. H.,Hasekamp, O.,Stam, D. M.,Volten, H.,iSPEX Team,

Apr 2012
EGU General Assembly 2012, held 22-27 April, 2012 in Vienna, Austria., p.13035

227

iSPEX: the creation of an aerosol sensor network of smartphone spectropolarimeters

Snik, F.,Heikamp, S.,de Boer, J.,Keller, C. U.,van Harten, G.,Smit, J. M.,Rietjens, J. H. H.,Hasekamp, O.,Stam, D. M.,Volten, H.,iSPEX Team,

Apr 2012
EGU General Assembly 2012, held 22-27 April, 2012 in Vienna, Austria., p.12974

226

Observing the Earth as an exoplanet

Karalidi, T.,Stam, D. M.,Snik, F.,Keller, C. U.,Sparks, W. B.,Bagnulo, S.,

Apr 2012
EGU General Assembly 2012, held 22-27 April, 2012 in Vienna, Austria., p.10571

225

Multiwavelength imaging polarimetry of Venus at various phase angles

Einarsen, L. J.,Rodenhuis, M.,Snik, F.,Keller, C. U.,Stam, D. M.,de Kok, R. J.,Bianda, M.,Ramelli, R.,

Apr 2012
EGU General Assembly 2012, held 22-27 April, 2012 in Vienna, Austria., p.8670

224

Coherence-gated wavefront sensing for microscopy using fringe analysis

van Werkhoven, Tim,Truong, Hoa,Antonello, Jacopo,Fraanje, Rufus,Gerritsen, Hans,Verhaegen, Michel,Keller, Christoph,

Mar 2012
Proceedings of the SPIE, Volume 8253, id. 82530E-82530E-7 (2012).

223

Planetary science: In search of biosignatures

Keller, Christoph U.,Stam, Daphne M.,

Mar 2012
Nature, Volume 483, Issue 7387, pp. 38-39 (2012).

222

Magnetism, chemical spots, and stratification in the HgMn star ϕ Phoenicis

Makaganiuk, V.,Kochukhov, O.,Piskunov, N.,Jeffers, S. V.,Johns-Krull, C. M.,Keller, C. U.,Rodenhuis, M.,Snik, F.,Stempels, H. C.,Valenti, J. A.,

Mar 2012
Astronomy & Astrophysics, Volume 539, id.A142, 15 pp.

221

Direct imaging of a massive dust cloud around R Coronae Borealis

Jeffers, S. V.,Min, M.,Waters, L. B. F. M.,Canovas, H.,Rodenhuis, M.,de Juan Ovelar, M.,Chies-Santos, A. L.,Keller, C. U.,

Mar 2012
Astronomy & Astrophysics, Volume 539, id.A56, 8 pp.

220

Joint optimization of phase diversity and adaptive optics: demonstration of potential

Korkiakoski, Visa,Keller, Christoph U.,Doelman, Niek,Fraanje, Rufus,Verhaegen, Michel,

Jan 2012
Applied Optics, vol. 51, issue 1, p. 102

219

The effects of disk and dust structure on observed polarimetric images of protoplanetary disks

Min, M.,Canovas, H.,Mulders, G. D.,Keller, C. U.,

Jan 2012
Astronomy & Astrophysics, Volume 537, id.A75, 13 pp.

218

Signatures of Water Clouds on Exoplanets: Numerical Simulations.

Karalidi, T.,Stam, D. M.,Keller, C. U.,

Dec 2011
Molecules in the Atmospheres of Extrasolar Planets, proceedings of a conference held at Observatoire de Paris, Paris, France 19-21 November, 2008. ASP Conference Series, Vol. 450. Edited by J.P. Beaulieu, S. Dieteres, and G. Tinetti. San Francisco: Astronomical Society of the Pacific, 2011., p.101

217

New Insights into Stellar Magnetism from the Spectropolarimetry in All Four Stokes Parameters

Kochukhov, O.,Snik, F.,Piskunov, N.,Jeffers, S. V.,Keller, C. U.,Makaganiuk, V.,Valenti, J. A.,Johns-Krull, C. M.,Rodenhuis, M.,Stempels, H. C.,

Dec 2011
16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun. ASP Conference Series, Vol. 448, proceedings of a conference held August 28- September 2, 2010 at the University of Washington, Seattle, Washington. Edited by Christopher M. Johns-Krull, Matthew K. Browning, and Andrew A. West. San Francisco: Astronomical Society of the Pacific, 2012., p.245

216

Innovative Imaging of Young Stars: First Light ExPo Observations

Jeffers, S. V.,Canovas, H.,Keller, C. U.,Min, M.,Rodenhuis, M.,

215

Spectropolarimeter for planetary exploration (SPEX): performance measurements with a prototype

Voors, Robert,Moon, Scott G.,Hannemann, Sandro,Rietjens, Jeroen H. H.,van Harten, Gerard,Snik, Frans,Smit, Martijn,Stam, Daphne M.,Keller, Christoph U.,Laan, Erik C.,Verlaan, Adrianus L.,Vliegenthart, Willem A.,ter Horst, Rik,Navarro, Ramón,Wielenga, Klaas,

Nov 2011
Proceedings of the SPIE, Volume 8176, id. 81760D (2011).

214

Simulating Polarized Light from Exoplanets

Jeffers, S. V.,Miesen, N.,Rodenhuis, M.,Keller, C. U.,Canovas, H.,

Nov 2011
Astronomical Polarimetry 2008: Science from Small to Large Telescopes. Proceedings of a Workshop held at Fairmont Le Manoir Richelieu, La Malbaie, Quebec, Canada 6-11 July 2008. Edited by Pierre Bastien, Nadine Manset, Dan P. Clemens, and Nicole St-Louis. ASP Conference Series, Vol. 449. San Francisco: Astronomical Society of the Pacific, 2012., p.391

213

Data Reduction Approach for the Extreme Polarimeter

Canovas, H.,Rodenhuis, M.,Jeffers, S. V.,Keller, C. U.,

212

Design and Prototype Results of the ExPo Imaging Polarimeter

Rodenhuis, M.,Canovas, H.,Jeffers, S.,Keller, C.,

211

Prototyping for the Spectropolarimeter for Planetary EXploration (SPEX): calibration and sky measurements

van Harten, Gerard,Snik, Frans,Rietjens, Jeroen H. H.,Smit, J. Martijn,de Boer, Jozua,Diamantopoulou, Renia,Hasekamp, Otto P.,Stam, Daphne M.,Keller, Christoph U.,Laan, Erik C.,Verlaan, Ad L.,Vliegenthart, Willem A.,ter Horst, Rik,Navarro, Ramón,Wielinga, Klaas,Hannemann, Sandro,Moon, Scott G.,Voors, Robert,

Oct 2011
Proceedings of the SPIE, Volume 8160, id. 81600Z (2011).

210

M&m's: an error budget and performance simulator code for polarimetric systems

de Juan Ovelar, Maria,Snik, Frans,Keller, Christoph U.,

Oct 2011
Proceedings of the SPIE, Volume 8160, id. 81600C (2011).

209

The ZIMPOL high contrast imaging polarimeter for SPHERE: sub-system test results

Roelfsema, Ronald,Gisler, Daniel,Pragt, Johan,Schmid, Hans Martin,Bazzon, Andreas,Dominik, Carsten,Baruffolo, Andrea,Beuzit, Jean-Luc,Charton, Julien,Dohlen, Kjetil,Downing, Mark,Elswijk, Eddy,Feldt, Markus,de Haan, Menno,Hubin, Norbert,Kasper, Markus,Keller, Christoph,Lizon, Jean-Louis,Mouillet, David,Pavlov, Alexey,Puget, Pascal,Rochat, Sylvain,Salasnich, Bernardo,Steiner, Peter,Thalmann, Christian,Waters, Rens,Wildi, François,

Oct 2011
Proceedings of the SPIE, Volume 8151, id. 81510N (2011).

208

No magnetic field in the spotted HgMn star μ Leporis

Kochukhov, O.,Makaganiuk, V.,Piskunov, N.,Jeffers, S. V.,Johns-Krull, C. M.,Keller, C. U.,Rodenhuis, M.,Snik, F.,Stempels, H. C.,Valenti, J. A.,

Oct 2011
Astronomy & Astrophysics, Volume 534, id.L13, 4 pp.

207

Fast horizontal flows in a quiet sun MHD simulation and their spectroscopic signatures

Vitas, N.,Fischer, C. E.,Vögler, A.,Keller, C. U.,

Aug 2011
Astronomy & Astrophysics, Volume 532, id.A110, 11 pp.

206

The search for magnetic fields in mercury-manganese stars

Makaganiuk, Vitalii,Kochukhov, Oleg,Piskunov, Nikolai,Jeffers, Sandra V.,Johns-Krull, Christopher M.,Keller, Christoph U.,Rodenhuis, Michiel,Snik, Frans,Stempels, Henricus C.,Valenti, Jeff A.,

Jul 2011
Active OB stars: structure, evolution, mass loss, and critical limits, Proceedings of the International Astronomical Union, IAU Symposium, Volume 272, p. 202-203

205

Spectral and polarimetric characterization of gazeous and telluric planets with SEE COAST

Boccaletti, A.,Baudoz, P.,Mawet, D.,Schneider, J.,Tinetti, G.,Galicher, R.,Stam, D.,Cavarroc, C.,Hough, J.,Doel, P.,Pinfield, D.,Keller, C.-U.,Beuzit, J.-L.,Udry, S.,Ferrari, A.,Martin, E.,Ménard, F.,Sein, E.,

Jul 2011
Research, Science and Technology of Brown Dwarfs and Exoplanets: Proceedings of an International Conference held in Shangai on Occasion of a Total Eclipse of the Sun, Shangai, China, Edited by E.L. Martin; J. Ge; W. Lin; EPJ Web of Conferences, Volume 16, id.07002

204

Data-reduction techniques for high-contrast imaging polarimetry. Applications to ExPo

Canovas, H.,Rodenhuis, M.,Jeffers, S. V.,Min, M.,Keller, C. U.,

Jul 2011
Astronomy & Astrophysics, Volume 531, id.A102, 9 pp.

203

First Detection of Linear Polarization in the Line Profiles of Active Cool Stars

Kochukhov, O.,Makaganiuk, V.,Piskunov, N.,Snik, F.,Jeffers, S. V.,Johns-Krull, C. M.,Keller, C. U.,Rodenhuis, M.,Valenti, J. A.,

May 2011
The Astrophysical Journal Letters, Volume 732, Issue 2, article id. L19, 4 pp. (2011).

202

Chemical spots in the absence of magnetic field in the binary HgMn star 66 Eridani

Makaganiuk, V.,Kochukhov, O.,Piskunov, N.,Jeffers, S. V.,Johns-Krull, C. M.,Keller, C. U.,Rodenhuis, M.,Snik, F.,Stempels, H. C.,Valenti, J. A.,

May 2011
Astronomy & Astrophysics, Volume 529, id.A160, 12 pp.

201

The Polarization Optics for the European Solar Telescope

Bettonvil, F. C. M.,Collados, M.,Feller, A.,Gelly, B. F.,Keller, C. U.,Kentischer, T. J.,López Ariste, A.,Pleier, O.,Snik, F.,Socas-Navarro, H.,

Apr 2011
Solar Polarization 6. Proceedings of a conference held in Maui, Hawaii, USA on May 30 to June 4, 2010. Edited by J. R. Kuhn, D. M. Harrington, H. Lin, S. V. Berdyugina, J. Trujillo-Bueno, S. L. Keil, and T. Rimmele. San Francisco: Astronomical Society of the Pacific, 2011., p.329

200

The HARPS Polarimeter

Snik, F.,Kochukhov, O.,Piskunov, N.,Rodenhuis, M.,Jeffers, S.,Keller, C.,Dolgopolov, A.,Stempels, E.,Makaganiuk, V.,Valenti, J.,Johns-Krull, C.,

199

HARPSpol — The New Polarimetric Mode for HARPS

Piskunov, N.,Snik, F.,Dolgopolov, A.,Kochukhov, O.,Rodenhuis, M.,Valenti, J.,Jeffers, S.,Makaganiuk, V.,Johns-Krull, C.,Stempels, E.,Keller, C.,

Mar 2011
The Messenger, vol. 143, p. 7-10

198

The search for magnetic fields in mercury-manganese stars

Makaganiuk, V.,Kochukhov, O.,Piskunov, N.,Jeffers, S. V.,Johns-Krull, C. M.,Keller, C. U.,Rodenhuis, M.,Snik, F.,Stempels, H. C.,Valenti, J. A.,

Jan 2011
Astronomy and Astrophysics, Volume 525, id.A97, 12 pp.

197

EPOL: the exoplanet polarimeter for EPICS at the E-ELT

Snik, F.,Keller, C.,Ovelar, M. J.,Rodenhuis, M.,Korkiakoski, V.,Venema, L.,Jager, R.,Rigal, F.,Hanenburg, H.,Roelfsema, R.,Schmidt, H. M.,Verinaud, C.,Kasper, M.,Martinez, P.,Yaitskova, N.,

Oct 2010
Proceedings of the conference In the Spirit of Lyot 2010: Direct Detection of Exoplanets and Circumstellar Disks. October 25 - 29, 2010. University of Paris Diderot, Paris, France. Edited by Anthony Boccaletti.

196

Imaging polarimetry of protoplanetary disks: feasibility and usability

Min, M.,Jeffers, S. V.,Rodenhuis, M.,Canovas, H.,Buenzli, E.,Keller, C. U.,Waters, L. B. F. M.,Dominik, C.,

195

Imaging polarimetry of circumstellar environments with the Extreme Polarimeter

Rodenhuis, M.,Canovas, H.,Jeffers, S. V.,Min, M.,Keller, C. U.,

194

Observations of solar scattering polarization at high spatial resolution

Snik, F.,de Wijn, A. G.,Ichimoto, K.,Fischer, C. E.,Keller, C. U.,Lites, B. W.,

Sep 2010
Astronomy and Astrophysics, Volume 519, id.A18, 9 pp.

193

The polarization optics for the European Solar Telescope (EST)

Bettonvil, F. C. M.,Collados, M.,Feller, A.,Gelly, B. F.,Keller, C. U.,Kentischer, T. J.,López Ariste, A.,Pleier, O.,Snik, F.,Socas-Navarro, H.,

Jul 2010
Proceedings of the SPIE, Volume 7735, id. 77356I (2010).

192

EPOL: the exoplanet polarimeter for EPICS at the E-ELT

Keller, Christoph U.,Schmid, Hans Martin,Venema, Lars B.,Hanenburg, Hiddo,Jager, Rieks,Kasper, Markus,Martinez, Patrice,Rigal, Florence,Rodenhuis, Michiel,Roelfsema, Ronald,Snik, Frans,Verinaud, Christophe,Yaitskova, Natalia,

Jul 2010
Proceedings of the SPIE, Volume 7735, id. 77356G (2010).

191

The ZIMPOL high-contrast imaging polarimeter for SPHERE: design, manufacturing, and testing

Roelfsema, Ronald,Schmid, Hans Martin,Pragt, Johannes,Gisler, Daniel,Waters, Rens,Bazzon, Andreas,Baruffolo, Andrea,Beuzit, Jean-Luc,Boccaletti, Anthony,Charton, Julien,Cumani, Claudio,Dohlen, Kjetil,Downing, Mark,Elswijk, Eddy,Feldt, Markus,Groothuis, Charlotte,de Haan, Menno,Hanenburg, Hiddo,Hubin, Norbert,Joos, Franco,Kasper, Markus,Keller, Christoph,Kragt, Jan,Lizon, Jean-Louis,Mouillet, David,Pavlov, Aleksej,Rigal, Florence,Rochat, Sylvain,Salasnich, Bernardo,Steiner, Peter,Thalmann, Christian,Venema, Lars,Wildi, François,

Jul 2010
Proceedings of the SPIE, Volume 7735, id. 77354B (2010).

190

EPICS: direct imaging of exoplanets with the E-ELT

Kasper, Markus,Beuzit, Jean-Luc,Verinaud, Christophe,Gratton, Raffaele G.,Kerber, Florian,Yaitskova, Natalia,Boccaletti, Anthony,Thatte, Niranjan,Schmid, Hans Martin,Keller, Christoph,Baudoz, Pierre,Abe, Lyu,Aller-Carpentier, Emmanuel,Antichi, Jacopo,Bonavita, Mariangela,Dohlen, Kjetil,Fedrigo, Enrico,Hanenburg, Hiddo,Hubin, Norbert,Jager, Rieks,Korkiakoski, Visa,Martinez, Patrice,Mesa, Dino,Preis, Olivier,Rabou, Patrick,Roelfsema, Ronald,Salter, Graeme,Tecza, Mathias,Venema, Lars,

Jul 2010
Proceedings of the SPIE, Volume 7735, id. 77352E-77352E-9 (2010).

189

SPEX: the spectropolarimeter for planetary exploration

Snik, Frans,Rietjens, Jeroen H. H.,van Harten, Gerard,Stam, Daphne M.,Keller, Christoph U.,Smit, J. Martijn,Laan, Erik C.,Verlaan, Ad L.,Ter Horst, Rik,Navarro, Ramón,Wielinga, Klaas,Moon, Scott G.,Voors, Robert,

Jul 2010
Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave. Edited by Oschmann, Jacobus M., Jr.; Clampin, Mark C.; MacEwen, Howard A. Proceedings of the SPIE, Volume 7731, article id. 77311B, 12 pp. (2010).

188

Inversions of High-Cadence SOLIS-VSM Stokes Observations

Fischer, C. E.,Keller, C. U.,Snik, F.,

n/a 2010
Magnetic Coupling between the Interior and Atmosphere of the Sun, edited by S.S. Hasan and R.J. Rutten; Astrophysics and Space Science Proceedings. ISSN 1570-6591 (Print) 1570-6605 (Online) Published by Springer Berlin Heidelberg; ISBN 978-3-642-02858-8 (Print) 978-3-642-02859-5 (Online), pp.515-515

187

EPICS, the exoplanet imager for the E-ELT

Kasper, M.,Beuzit, J.-L.,Verinaud, C.,Baudoz, P.,Boccaletti, A.,Gratton, R.,Keller, C.,Kerber, F.,Schmid, H. M.,Thatte, N.,Venema, L.,Yaitskova, N.,

n/a 2010
1st AO4ELT conference - Adaptative Optics for Extremely Large Telescopes, held 22-26 June, 2009 in Paris, France. Edited by Y. Clénet, J.-M. Conan, Th. Fusco, and G. Rousset. EDP Sciences, 2010, id.02009

186

Two Ways of Improving Stokes Inversions

Becher, H.-M.,Fischer, C.,Keller, C.,

Dec 2009
The Second Hinode Science Meeting: Beyond Discovery-Toward Understanding ASP Conference Series, Vol. 415, proceedings of a meeting held 29 September through 3 October 2008 at the National Center for Atmospheric Research, Boulder, Colorado, USA. Edited by B. Lites, M. Cheung, T. Magara, J. Mariska, and K. Reeves. San Francisco: Astronomical Society of the Pacific, 2009, p.160

185

Statistics of Convective Collapse Events in the Photosphere and Chromosphere Observed with the HINODE SOT

Fischer, C. E.,de Wijn, A. G.,Centeno, R.,Lites, B. W.,Keller, C. U.,

184

The case for spectropolarimetry with SPEX on EJSM

Stam, D. M.,Smit, J. M.,Snik, F.,Keller, C. U.,

Sep 2009
"European Planetary Science Congress 2009, held 14-18 September in Potsdam, Germany. http://meetings.copernicus.org/epsc2009, p.536"

183

Statistics of convective collapse events in the photosphere and chromosphere observed with the Hinode SOT

Fischer, C. E.,de Wijn, A. G.,Centeno, R.,Lites, B. W.,Keller, C. U.,

Sep 2009
Astronomy and Astrophysics, Volume 504, Issue 2, 2009, pp.583-588

182

An IFU for diffraction-limited 3D spectroscopic imaging: laboratory and on-site tests

Ren, Deqing,Keller, Christoph,Plymate, Claude,

Aug 2009
Solar Physics and Space Weather Instrumentation III. Edited by Fineschi, Silvano; Fennelly, Judy A. Proceedings of the SPIE, Volume 7438, article id. 743818, 6 pp. (2009).

181

Polarimetric Measurements of Protoplanetary Disks with ExPo

Canovas, H.,Rodenhuis, M.,Jeffers, S. V.,Keller, C. U.,

Aug 2009
EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY: Proceedings of the International Conference. AIP Conference Proceedings, Volume 1158, pp. 381-382 (2009).

180

The Prototype of the Small Synoptic Second Solar Spectrum Telescope (S^5T)

Snik, F.,Melich, R.,Keller, C. U.,

Jun 2009
Solar Polarization 5: In Honor of Jan Stenflo ASP Conference Series, Vol. 405, proceedings of the conference held 17-21 September, 2007 at Centro Stefano Franscini--Monte Veritá, Ascona, Switzerland. Edited by Svetlana V. Berdyugina, K. N. Nagendra, and Renzo Ramelli. San Francisco: Astronomical Society of the Pacific, 2009., p.383

179

Polarimetry from the Ground Up

Keller, C. U.,Snik, F.,

178

Vector Magnetic Field Inversions of High Cadence SOLIS-VSM Data

Fischer, C. E.,Keller, C. U.,Snik, F.,

177

SOLIS Vector Spectromagnetograph: Status and Science

Henney, C. J.,Keller, C. U.,Harvey, J. W.,Georgoulis, M. K.,Hadder, N. L.,Norton, A. A.,Raouafi, N.-E.,Toussaint, R. M.,

176

A Brief History of the Second Solar Spectrum

Keller, C. U.,

175

Polarization Properties of Real Aluminum Mirrors, I. Influence of the Aluminum Oxide Layer

van Harten, G.,Snik, F.,Keller, C. U.,

Apr 2009
Publications of the Astronomical Society of the Pacific, Volume 121, Issue 878, pp. 377 (2009).

174

Super earth explorer: a coronagraphic off-axis space telescope

Schneider, J.,Boccaletti, A.,Mawet, D.,Baudoz, P.,Beuzit, J.-L.,Doyon, R.,Marley, M.,Stam, D.,Tinetti, G.,Traub, W.,Trauger, J.,Aylward, A.,Cho, J. Y.-K.,Keller, C.-U.,Udry, S.,SEE-COAST Team,

Mar 2009
Experimental Astronomy, Volume 23, Issue 1, pp.357-377

173

Spectral modulation for full linear polarimetry

Snik, Frans,Karalidi, Theodora,Keller, Christoph U.,

Mar 2009
Applied Optics, Vol. 48, Issue 7, p. 1337-1346

172

An analytical model to demonstrate the reliability of reconstructed `active longitudes'.

Jeffers, S. V.,Keller, C. U.,

Feb 2009
COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun. AIP Conference Proceedings, Volume 1094, pp. 664-667 (2009).

171

Characterization of Extra-solar Planets with Direct-Imaging Techniques

Tinetti, Giovanna,Cash, Webster,Glassman, Tiffany,Keller, C.,Oakley, Phil,Snik, F.,Stam, Daphne,Turnbull, Margret,

n/a 2009
Astro2010: The Astronomy and Astrophysics Decadal Survey, Science White Papers, no. 296

170

Polarimetry of Mars with SPEX, an Innovative Spectropolarimeter

Stam, D. M.,Laan, E.,Snik, F.,Karalidi, T.,Keller, C.,Ter Horst, R.,Navarro, R.,Aas, C.,de Vries, J.,Oomen, G.,Hoogeveen, R.,

Nov 2008
Third International Workshop on The Mars Atmosphere: Modeling and Observations, held November 10-13, 2008 in Williamsburg, Virginia. LPI Contribution No. 1447, p.9078

169

Diversity among other worlds: characterization of exoplanets by direct detection

Schneider, J.,Boccaletti, A.,Aylward, A.,Baudoz, P.,Beuzit, J. -L.,Brown, R.,Cho, J.,Dohlen, K.,Ferrari, M.,Galicher, R.,Grasset, O.,Grenfell, L.,Griessmeier, J. -M.,Guyon, O.,Hough, J.,Kasper, M.,Keller, Ch.,Longmore, A.,Lopez, B.,Martin, E.,Mawet, D.,Menard, F.,Merin, B.,Palle, E.,Perrin, G.,Pinfield, D.,Sein, E.,Shore, P.,Sotin, Ch.,Sozzetti, A.,Stam, D.,Surdej, J.,Tamburini, F.,Tinetti, G.,Udry, S.,Verinaud, C.,Walker, D.,

Nov 2008
eprint arXiv:0811.2496

168

A New Era in Solar Thermal-IR Astronomy: the NSO Array Camera (NAC) on the McMath-Pierce Telescope

Ayres, T.,Penn, M.,Plymate, C.,Keller, C.,

Sep 2008
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/, p.2.74"

167

Design of a laboratory simulator to test exoplanet imaging polarimetry

Jeffers, S. V.,Miesen, N.,Rodenhuis, M.,Keller, C. U.,

Jul 2008
Ground-based and Airborne Instrumentation for Astronomy II. Edited by McLean, Ian S.; Casali, Mark M. Proceedings of the SPIE, Volume 7014, article id. 70147B, 8 pp. (2008).

166

The Extreme Polarimeter (ExPo): design of a sensitive imaging polarimeter

Rodenhuis, M.,Canovas, H.,Jeffers, S. V.,Keller, C. U.,

Jul 2008
Ground-based and Airborne Instrumentation for Astronomy II. Edited by McLean, Ian S.; Casali, Mark M. Proceedings of the SPIE, Volume 7014, article id. 70146T, 9 pp. (2008).

165

SPHERE ZIMPOL: overview and performance simulation

Thalmann, Christian,Schmid, Hans M.,Boccaletti, Anthony,Mouillet, David,Dohlen, Kjetil,Roelfsema, Ronald,Carbillet, Marcel,Gisler, Daniel,Beuzit, Jean-Luc,Feldt, Markus,Gratton, Raffaele,Joos, Franco,Keller, Christoph U.,Kragt, Jan, II,Pragt, Johan H.,Puget, Pascal,Rigal, Florence,Snik, Frans,Waters, Rens,Wildi, François,

Jul 2008
Ground-based and Airborne Instrumentation for Astronomy II. Edited by McLean, Ian S.; Casali, Mark M. Proceedings of the SPIE, Volume 7014, article id. 70143F, 12 pp. (2008).

164

The upgrade of HARPS to a full-Stokes high-resolution spectropolarimeter

Snik, Frans,Jeffers, Sandra,Keller, Christoph,Piskunov, Nikolai,Kochukhov, Oleg,Valenti, Jeff,Johns-Krull, Christopher,

Jul 2008
Ground-based and Airborne Instrumentation for Astronomy II. Edited by McLean, Ian S.; Casali, Mark M. Proceedings of the SPIE, Volume 7014, article id. 70140O, 10 pp. (2008).

163

SPEX: an in-orbit spectropolarimeter for planetary exploration

Snik, Frans,Karalidi, Theodora,Keller, Christoph,Laan, Erik,ter Horst, Rik,Navarro, Ramon,Stam, Daphne,Aas, Christina,de Vries, Johan,Oomen, Gijs,Hoogeveen, Ruud,

Jul 2008
Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter. Edited by Oschmann, Jacobus M., Jr.; de Graauw, Mattheus W. M.; MacEwen, Howard A. Proceedings of the SPIE, Volume 7010, article id. 701015, 10 pp. (2008).

162

New Observations of the Magnetic Vector Field across the Solar Disk

Keller, C. U.,Harvey, J. W.,Henney, C. J.,

Apr 2008
14th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun ASP Conference Series, Vol. 384, proceedings of the conference held 5-10 November, 2006, at the Spitzer Science Center and Michelson Science Center, Pasadena, California, USA. Edited by Gerard van Belle., p.166

161

Design Options for the Extreme Polarimeter (ExPo)

Rodenhuis, M.,Keller, C. U.,

Jun 2007
Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21st Century. June 04 - 08, 2007. University of California, Berkeley, CA, USA. Edited by Paul Kalas.

160

Science Goals of the Extreme Polarimeter (ExPo)

Jeffers, S. V.,Keller, C. U.,Rodenhuis, M.,Miesen, N.,

159

Seething Horizontal Magnetic Fields in the Quiet Solar Photosphere

Harvey, J. W.,Branston, D.,Henney, C. J.,Keller, C. U.,SOLIS Team,GONG Team,

May 2007
American Astronomical Society Meeting 210, id.100.01; Bulletin of the American Astronomical Society, Vol. 39, p.227

158

Seething Horizontal Magnetic Fields in the Quiet Solar Photosphere

Harvey, J. W.,Branston, D.,Henney, C. J.,Keller, C. U.,SOLIS and GONG Teams,

Apr 2007
The Astrophysical Journal, Volume 659, Issue 2, pp. L177-L180.

157

The Ba II 4554 / Hβ Imaging Polarimeter for the Dutch Open Telescope

Snik, F.,Bettonvil, F. C. M.,Jägers, A. P. L.,Hammerschlag, R. H.,Rutten, R. J.,Keller, C. U.,

Dec 2006
Solar Polarization 4, ASP Conference Series, Vol. 358, Proceedings of the conference held 19-23 September, 2005, in Boulder, Colorado, USA. Edited by R. Casini and B. W. Lites, p.205

156

SOLIS-VSM Solar Vector Magnetograms

Henney, C. J.,Keller, C. U.,Harvey, J. W.,

Dec 2006
Solar Polarization 4, ASP Conference Series, Vol. 358, Proceedings of the conference held 19-23 September, 2005, in Boulder, Colorado, USA. Edited by R. Casini and B. W. Lites, p.92

155

High-Resolution Surface Observations and What They Can Tell MHD Simulations

Keller, C. U.,

Dec 2006
Solar MHD Theory and Observations: A High Spatial Resolution Perspective ASP Conference Series, Vol. 354, Proceedings of the Conference Held 18-22 July, 2005, at the National Solar Observatory, Sacramento Peak, Sunspot, New Mexico, USA. Edited by J. Leibacher, R. F. Stein, and H. Uitenbroek. San Francisco: Astronomical Society of the Pacific, 2006., p.3

154

Solar Carbon Monoxide, Thermal Profiling, and the Abundances of C, O, and Their Isotopes

Ayres, Thomas R.,Plymate, Claude,Keller, Christoph U.,

Aug 2006
The Astrophysical Journal Supplement Series, Volume 165, Issue 2, pp. 618-651.

153

Development of an IFU for diffraction-limited 3D spectropolarimetry

Ren, Deqing,Keller, Christoph,Plymate, Claude,

Jun 2006
Ground-based and Airborne Instrumentation for Astronomy. Edited by McLean, Ian S.; Iye, Masanori. Proceedings of the SPIE, Volume 6269, id. 62695Z (2006).

152

Design of a polarimeter for extrasolar planetary systems characterization

Keller, Christoph U.,

Jun 2006
Ground-based and Airborne Instrumentation for Astronomy. Edited by McLean, Ian S.; Iye, Masanori. Proceedings of the SPIE, Volume 6269, id. 62690T (2006).

151

Mapping sodium distribution in the exosphere of Mercury with tip-tilt image stabilization

Potter, A. E.,Plymate, C.,Keller, C.,Killen, R. M.,Morgan, T. H.,

Jan 2006
Advances in Space Research, Volume 38, Issue 4, p. 599-603.

150

C3Po --- The Ultimate Focal Plane Array for Imaging Polarimetry from 200 nm to 20 μm

Keller, C. U.,

Dec 2005
Astronomical Polarimetry: Current Status and Future Directions ASP Conference Series, Vol. 343, Proceedings of the Conference held 15-19 March, 2004 in Waikoloa, Hawai'i, USA. Edited by A. Adamson, C. Aspin, C. J. Davis, and T. Fujiyoshi, p.33

149

High precision polarimetry with the Advanced Technology Solar Telescope

Socas-Navarro, Hector,Elmore, David F.,Keller, Christoph U.,Seagraves, Paul H.,Streander, Kim V.,Card, Gregory L.,Warner, Mark,Kuhn, Jeffrey R.,Mickey, Donald L.,

Aug 2005
Solar Physics and Space Weather Instrumentation. Edited by Fineschi, Silvano; Viereck, Rodney A. Proceedings of the SPIE, Volume 5901, pp. 52-59 (2005).

148

SOLIS-VSM Synoptic Products

Henney, C. J.,Harvey, J. W.,Keller, C. U.,

May 2005
American Geophysical Union, Spring Meeting 2005, abstract id.SP51A-04

147

Reduction of SOLIS/Vector Spectromagnetograph He I 1083 nm Observations

Jones, H. P.,Malanushenko, O. V.,Harvey, J. W.,Henney, C. J.,Keller, C. U.,

May 2005
American Geophysical Union, Spring Meeting 2005, abstract id.SP51A-02

146

The Solar Oxygen Abundance, and the Rare Isotopes of C and O, Derived from Infrared Spectra of Carbon Monoxide

Ayres, T. R.,Plymate, C.,Keller, C.,Kurucz, R. L.,

May 2005
American Geophysical Union, Spring Meeting 2005, abstract id.SP41B-09

145

First-Light Instrumentation for the Advanced Technology Solar Telescope

Rimmele, T.,Balasubramaniam, K.,Berger, T.,Elmore, D.,Gary, A.,Keller, C.,Kuhn, J.,Lin, H.,Mickey, D.,Pevtsov, A.,Robinson, B.,Sigwarth, M.,Soccas-Navarro, H.,

May 2005
American Geophysical Union, Spring Meeting 2005, abstract id.SP34A-03

144

Are You Being Served? - Solar Data Management at the National Solar Observatory

Hill, F.,Suarez-Sola, I.,Harvey, J. W.,Henney, C. J.,Keller, C.,Wampler, S.,

May 2005
American Geophysical Union, Spring Meeting 2005, abstract id.SH43B-04

143

An integrated multiangle, multispectral, and polarimetric imaging concept for aerosol remote sensing from space

Diner, David J.,Chipman, Russell A.,Beaudry, Neil A.,Cairns, Brian,Foo, Leslie D.,Macenka, Steven A.,Cunningham, Thomas J.,Seshadri, Suresh,Keller, Christoph U.,

Jan 2005
Proceedings of the SPIE, Volume 5659, p. 88-96 (2005).

142

Helicity and the SOLIS Vector-Spectromagnetograph

Keller, Christoph U.,Harvey, John W.,Henney, Carl. J.,Jones, Harrison P.,

Jan 2005
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July 2003]. Edited by O. Engvold. San Francisco, CA: Astronomical Society of the Pacific, ISBN 1-58381-189-3. XXIX + 1085 pp., 2005, p.126

141

Adaptive Optics Observations of the Sun

Keller, Christoph U.,

n/a 2005
Science with Adaptive Optics, Proceedings of the ESO Workshop Held at Garching, Germany, 16-19 September 2003. Edited by W. Brandner and M. E. Kasper. 387 p. Library of Congress Catalog Card No. 200592215. ISBN: 3-540-25034-4. Published by Springer, Berlin 2005, p.119

140

Instrumentation for the Advanced Technology Solar Telescope

Rimmele, Thomas R.,Hubbard, Robert P.,Balasubramaniam, K. S.,Berger, Tom,Elmore, David,Gary, G. Allen,Jennings, Don,Keller, Christoph,Kuhn, Jeff,Lin, Haosheng,Mickey, Don,Moretto, Gilberto,Socas-Navarro, Hector,Stenflo, Jan O.,Wang, Haimin,

Sep 2004
Ground-based Instrumentation for Astronomy. Edited by Alan F. M. Moorwood and Iye Masanori. Proceedings of the SPIE, Volume 5492, pp. 944-957 (2004).

139

Radio Observations of the Quiet Sun

Keller, Christoph U.,Krucker, Säam,

Sep 2004
Solar and Space Weather Radiophysics, Astrophysics and Space Science Library, Volume 314. ISBN 978-1-4020-2813-7. Springer Science + Business Media, Inc., 2004, p. 287

138

Solar and Space Weather Radiophysics - Current Status and Future Developments

Gary, D. E.,Keller, C. U.,

Sep 2004
Solar and Space Weather Radiophysics - Current Status and Future Developments. Edited by Dale E. Gary, Center for Solar-Terrestrial Research, New Jersey Institute of Technology, Newark, N.J., U.S.A.; Christoph U. Keller, National Solar Observatory, Tucson, AZ, U.S.A. ASTROPHYSICS AND SPACE SCIENCE LIBRARY Volume 314 Kluwer Academic Publishers, Dordrecht

137

Evaluation of Seeing-Induced Cross Talk in Tip-Tilt-Corrected Solar Polarimetry

Judge, Philip G.,Elmore, David F.,Lites, Bruce W.,Keller, Christoph U.,Rimmele, Thomas,

Jul 2004
Applied Optics IP, vol. 43, Issue 19, pp.3817-3828

136

On the Origin of Solar Faculae

Keller, C. U.,Schüssler, M.,Vögler, A.,Zakharov, V.,

May 2004
The Astrophysical Journal, Volume 607, Issue 1, pp. L59-L62.

135

High-accuracy Multiangle Spectropolarimetric Imaging Concept for Aerosol Remote Sensing from Space

Diner, D. J.,Chipman, R. A.,Cairns, B.,Foo, L. D.,Keller, C. U.,Macenka, S. A.,Bruce, C. F.,

May 2004
American Geophysical Union, Spring Meeting 2004, abstract id.GC51A-07

134

Improved Spatial Resolution of the Sodium Distribution on Mercury

Potter, A. E.,Plymate, C.,Keller, C.,Killen, R. M.,Morgan, T. H.,

May 2004
American Astronomical Society Meeting 204, id.64.07; Bulletin of the American Astronomical Society, Vol. 36, p.780

133

Innovative Information Technology for Space Weather Research

Wang, H.,Qu, M.,Shih, F.,Denker, C.,Gerbessiotis, A.,Lofdahl, M.,Rees, D.,Keller, C.,

May 2004
American Astronomical Society Meeting 204, id.52.09; Bulletin of the American Astronomical Society, Vol. 36, p.755

132

Evershed Flow of CO at Different Depths in a Sunspot Penumbra.

Clark, T. Alan,Plymate, C.,Bergman, M. W.,Keller, C. U.,

May 2004
American Astronomical Society Meeting 204, id.37.20; Bulletin of the American Astronomical Society, Vol. 36, p.712

131

Measurement Scale of the SOLIS Vector Spectromagnetograph

Jones, H. P.,Harvey, J. W.,Henney, C. J.,Keller, C. U.,Malanushenko, O. M.,

May 2004
American Astronomical Society Meeting 204, id.37.03; Bulletin of the American Astronomical Society, Vol. 36, p.709

130

SOLIS-VSM Longitudinal Magnetogram Calibration

Henney, C. J.,Harvey, J. W.,Keller, C. U.,Jones, H. P.,

May 2004
American Astronomical Society Meeting 204, id.37.02; Bulletin of the American Astronomical Society, Vol. 36, p.709

129

Early Results from SOLIS

Harvey, J.,Giampapa, M.,Henney, C.,Keller, C.,Jones, H.,

May 2004
American Astronomical Society Meeting 204, id.37.01; Bulletin of the American Astronomical Society, Vol. 36, p.708

128

High-speed cameras and solar observing

Harvey, John,Keller, Christoph U.,Cole, Lonnie,Tucker, Roy,Jaksha, David,

Feb 2004
Telescopes and Instrumentation for Solar Astrophysics. Edited by Fineschi, Silvano; Gummin, Mark A. Proceedings of the SPIE, Volume 5171, pp. 258-268 (2004).

127

Charge caching CMOS detector for polarimetry (C3Po)

Keller, Christoph U.,

Feb 2004
Telescopes and Instrumentation for Solar Astrophysics. Edited by Fineschi, Silvano; Gummin, Mark A. Proceedings of the SPIE, Volume 5171, pp. 239-246 (2004).

126

Advanced Technology Solar Telescope: a progress report

Oschmann, Jim,Dalrymple, Nathan,Warner, Mark,Price, Ron,Hill, Frank,Hubbard, Rob,Rimmele, Thomas R.,Keller, Christoph U.,Keil, Stephen,

Feb 2004
Telescopes and Instrumentation for Solar Astrophysics. Edited by Fineschi, Silvano; Gummin, Mark A. Proceedings of the SPIE, Volume 5171, pp. 160-170 (2004).

125

Mapping sodium distribution on the surface of Mercury

Potter, A.,Plymate, C.,Keller, C.,Killen, R.,Morgan, T.,

n/a 2004
35th COSPAR Scientific Assembly. Held 18 - 25 July 2004, in Paris, France., p.1293

124

First Results from SOLIS

Harvey, J.,Giampapa, M.,Henney, C.,Jones, H.,Keller, C.,

Dec 2003
American Geophysical Union, Fall Meeting 2003, abstract id.SH42B-0545

123

Linear Polarization Measurements of Chromospheric Emission Lines

Sheeley, N. R., Jr.,Keller, C. U.,

Sep 2003
The Astrophysical Journal, Volume 594, Issue 2, pp. 1085-1101.

122

The SOLIS Vector-Spectromagnetograph (VSM)

Keller, C. U.,SOLIS Team,

May 2003
American Astronomical Society, SPD meeting #34, id.20.23; Bulletin of the American Astronomical Society, Vol. 35, p.848

121

Advanced Technology Solar Telescope - Approach to a Four-meter Diffraction Limited Solar Telescope

Keil, S.,Rimmele, T.,Oschmann, J.,Warner, M.,Dalrymple, N.,Hubbard, R.,Price, R.,Goodrich, B.,Keller, C.,ATST Team,

May 2003
American Astronomical Society, SPD meeting #34, id.20.19; Bulletin of the American Astronomical Society, Vol. 35, p.847

120

Calibration and Data Analysis for the SOLIS-VSM

Henney, C. J.,Harvey, J. W.,Keller, C. U.,Jones, H. P.,SOLIS Team,

May 2003
American Astronomical Society, SPD meeting #34, id.03.03; Bulletin of the American Astronomical Society, Vol. 35, p.808

119

Site testing issues for the frequency agile solar radiotelescope (FASR)

Gary, Dale E.,Keller, Christoph U.,

Feb 2003
Innovative Telescopes and Instrumentation for Solar Astrophysics. Edited by Stephen L. Keil, Sergey V. Avakyan . Proceedings of the SPIE, Volume 4853, pp. 523-530 (2003).

118

Low-cost solar adaptive optics in the infrared

Keller, Christoph U.,Plymate, Claude,Ammons, S. M.,

Feb 2003
Innovative Telescopes and Instrumentation for Solar Astrophysics. Edited by Stephen L. Keil, Sergey V. Avakyan . Proceedings of the SPIE, Volume 4853, pp. 351-359 (2003).

117

Design and development of the Advanced Technology Solar Telescope (ATST)

Keil, Stephen L.,Rimmele, Thomas,Keller, Christoph U.,Hill, Frank,Radick, Richard R.,Oschmann, Jacobus M.,Warner, Mark,Dalrymple, Nathan E.,Briggs, John,Hegwer, Steven L.,Ren, Dauxing,

Feb 2003
Innovative Telescopes and Instrumentation for Solar Astrophysics. Edited by Stephen L. Keil, Sergey V. Avakyan . Proceedings of the SPIE, Volume 4853, pp. 240-251 (2003).

116

SOLIS: an innovative suite of synoptic instruments

Keller, Christoph U.,Harvey, John W.,Giampapa, Mark S.,

Feb 2003
Innovative Telescopes and Instrumentation for Solar Astrophysics. Edited by Stephen L. Keil, Sergey V. Avakyan . Proceedings of the SPIE, Volume 4853, pp. 194-204 (2003).

115

PEPSI spectro-polarimeter for the LBT

Strassmeier, Klaus G.,Hofmann, Axel,Woche, Manfred F.,Rice, John B.,Keller, Christoph U.,Piskunov, N. E.,Pallavicini, Roberto,

Feb 2003
Polarimetry in Astronomy. Edited by Silvano Fineschi . Proceedings of the SPIE, Volume 4843, pp. 180-189 (2003).

114

Solar polarimetry close to the diffraction limit

Keller, Christoph U.,

Feb 2003
Polarimetry in Astronomy. Edited by Silvano Fineschi . Proceedings of the SPIE, Volume 4843, pp. 100-111 (2003).

113

Technical challenges of the Advanced Technology Solar Telescope

Rimmele, Thomas R.,Keil, Stephen L.,Keller, Christoph U.,Hill, Frank,Briggs, John,Dalrymple, Nathan E.,Goodrich, Bret D.,Hegwer, Steven L.,Hubbard, Rob,Oschmann, Jacobus M.,Radick, Richard R.,Ren, Deqing,Wagner, Jeremy,Wampler, Stephen,Warner, Mark,

Feb 2003
Large Ground-based Telescopes. Edited by Oschmann, Jacobus M.; Stepp, Larry M. Proceedings of the SPIE, Volume 4837, pp. 94-109 (2003).

112

Helicity and the SOLIS Vector-Spectromagnetograph

Keller, Christoph U.,Harvey, John W.,Henney, Carl J.,Jones, Harrison P.,

n/a 2003
Magnetic Fields and Helicity in the Sun and Heliosphere, 25th meeting of the IAU, Joint Discussion 3, 16 July, 2003, Sydney, Australia, meeting abstract id.18

111

Solar observing facilities

Fleck, B.,Keller, C. U.,

n/a 2003
In: Dynamic Sun. Edited by B. N. Dwivedi. Cambridge (UK): Cambridge University Press, ISBN 0-521-81057-4, 2003, p. 403 - 433

110

Polarimetry with the Advanced Technology Solar Telescope

Keller, C. U.,

n/a 2003
Solar Polarization, Proceedings of the Conference held 30 September - 4 October, 2002 at Tenerife, Canary Islands, Spain. Edited by Javier Trujillo-Bueno and Jorge Sanchez Almeida. ASP Conference Proceedings, Vol. 307. San Francisco: Astronomical Society of the Pacific, 2003., p.23

109

The SOLIS Vector-Spectromagnetograph

Keller, C. U.,Harvey, J. W.,Solis Team,

108

Polarimetry with the ATST (Invited review)

Keller, C. U.,

n/a 2003
Current Theoretical Models and Future High Resolution Solar Observations: Preparing for ATST, ASP Conference Series, Vol. 286, held 11-15 March 2002 at NSO, Sunspot, New Mexico, USA. Edited by Alexei A. Pevtsov and Han Uitenbroek. San Francisco: Astronomical Society of the Pacific, ISBN: 1-58381-129-X, 2003., p.31

107

Science Objectives and Technical Challenges of the Advanced Technology Solar Telescope (Invited review)

Rimmele, T.,Keil, S. L.,Keller, C.,Hill, F.,Penn, M.,Goodrich, B.,Hegwer, S.,Hubbard, R.,Oschmann, J.,Warner, M.,Dalrymple, N.,Radick, R.,Atst Team,

106

Design and development of the Advanced Technology Solar Telescope

Keil, S.,Rimmele, T.,Keller, C.,ATST Team,

n/a 2003
Astronomische Nachrichten, Vol. 324, No. 4, Issue 4, p. 303-304

105

Data analysis for the SOLIS Vector Spectromagnetograph

Jones, Harrison P.,Harvey, John W.,Henney, Carl J.,Hill, Frank,Keller, Christoph U.,

Oct 2002
In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 June 2002, Santorini, Greece. Ed. H. Sawaya-Lacoste. ESA SP-505. Noordwijk, Netherlands: ESA Publications Division, ISBN 92-9092-815-8, 2002, p. 15 - 18

104

Spectroscopic Detection of the 3.934 Micron Line of Si IX in the Solar Corona

Judge, P. G.,Tomczyk, S.,Livingston, W. C.,Keller, C. U.,Penn, M. J.,

Sep 2002
The Astrophysical Journal, Volume 576, Issue 2, pp. L157-L160.

103

The Advanced Technology Solar Telescope

Keller, C. U.,Rimmele, T. R.,Hill, F.,Keil, S. L.,Oschmann, J. M.,ATST Team,

Jul 2002
Astronomische Nachrichten, vol. 323, no. 3/4, p. 294-298

102

Spatial mapping of the Hanle and Zeeman effects on the Sun

Stenflo, J. O.,Gandorfer, A.,Holzreuter, R.,Gisler, D.,Keller, C. U.,Bianda, M.,

Jul 2002
Astronomy and Astrophysics, v.389, p.314-324 (2002)

101

Observational Signatures of a Solar Small-Scale Global Dynamo

Keller, C. U.,Stein, R. F.,Nordlund, A.,

May 2002
American Astronomical Society, 200th AAS Meeting, id.89.08; Bulletin of the American Astronomical Society, Vol. 34, p.792

100

Preliminary tests of a low-cost solar infrared adaptive optics system

Ammons, S. M.,Keller, C. U.,

May 2002
American Astronomical Society, 200th AAS Meeting, id.56.10; Bulletin of the American Astronomical Society, Vol. 34, p.736

Stokes Inversion Techniques for the SOLIS-VSM

Henney, C. J.,Keller, C. U.,Jones, H. P.,SOLIS Team,

May 2002
American Astronomical Society, 200th AAS Meeting, id.55.14; Bulletin of the American Astronomical Society, Vol. 34, p.734

The Advanced Technology Solar Telescope

Rimmele, T. R.,Keil, S. L.,Keller, C. U.,Hill, F.,Oschmann, J. M.,Warner, M.,Dalrymple, N. E.,ATST Team,

May 2002
American Astronomical Society, 200th AAS Meeting, id.34.08; Bulletin of the American Astronomical Society, Vol. 34, p.691

Instrumentation for astrophysical spectropolarimetry

Keller, Christoph U.,

n/a 2002
Astrophysical spectropolarimetry. Proceedings of the XII Canary Islands Winter School of Astrophysics, Puerto de la Cruz, Tenerife, Spain, November 13 - 24, 2000, edited by J. Trujillo-Bueno, F. Moreno-Insertis, and F. Sánchez. Cambridge, UK: Cambridge University Press, ISBN 0-521-80998-3, 2002, p. 303 - 354

Polarization Modulation for Solar Vector-Polarimeters using Ferroelectric Liquid Crystals

Pifer, R.,Keller, C.,

May 2001
American Geophysical Union, Spring Meeting 2001, abstract id.SP51B-05

The Advanced Technology Solar Telescope -- Science Goals and Instrument Description.

Rimmele, T. R.,Keil, S. L.,Keller, C. U.,Hill, F.,

May 2001
American Geophysical Union, Spring Meeting 2001, abstract id.SH31D-08 INVITED

Influence of magnetic fields on the coherence effects in the Na I D1 and D2 lines

Stenflo, J. O.,Gandorfer, A.,Wenzler, T.,Keller, C. U.,

Mar 2001
Astronomy and Astrophysics, v.367, p.1033-1048 (2001)

The Advanced Technology Solar Telescope

Keil, S. L.,Rimmele, T. R.,Keller, C. U.,Atst Team,

Jan 2001
Advanced Solar Polarimetry -- Theory, Observation, and Instrumentation -- 20TH NSO/Sac Summer Workshop, ASP Conference Proceedings, Vol. 236. Edited by Michael Sigwarth. San Francisco: Astronomical Society of the Pacific ISBN: 1-58381-073-0, 2001, p.597

High Resolution Polarimetry and the Need for a Large-Aperture Solar Telescope

Keller, C. U.,

The SOLIS Vector-Spectromagnetograph (VSM)

Keller, C. U.,Solis Team,

Solar Chromospheric Magnetic Fields

Keller, C. U.,

n/a 2001
Magnetic Fields Across the Hertzsprung-Russell Diagram, ASP Conference Proceedings Vol. 248. Edited by G. Mathys, S. K. Solanki, and D. T. Wickramasinghe. ISBN: 1-58381-088-9. San Francisco: Astronomical Society of the Pacific, 2001., p.61

The Advanced Technology Solar Telescope: Science Goals and Instrument Description

Rimmele, T.,Keller, C.,Keil, S.,Hill, F.,Atst Team,

n/a 2001
Astronomische Gesellschaft Abstract Series, Vol. 18., Abstracts of Contributed Talks and Posters presented at the Annual Scientific Meeting of the Astronomische Gesellschaft at the Joint European and National Meeting JENAM 2001 of the European Astronomical Society and the Astronomische Gesellschaft at Munich, September 10-15, 2001, abstract #MS 10 06.

The Advanced Solar Telescope

Keil, S. L.,Rimmele, T. R.,Keller, C.,Hill, F.,

Dec 2000
American Astronomical Society, 197th AAS Meeting, id.17.10; Bulletin of the American Astronomical Society, Vol. 32, p.1433

Results from a revisit to the K2V bright points

Sivaraman, K. R.,Gupta, S. S.,Livingston, W. C.,Damé, L.,Kalkofen, W.,Keller, C. U.,Smartt, R.,Hasan, S. S.,

Nov 2000
Astronomy and Astrophysics, v.363, p.279-288 (2000)

New Initiatives for Synoptic Observations

Keller, C. U.,

Jun 2000
Journal of Astrophysics and Astronomy, Vol. 21, p.127

New Results from the Flare Genesis Experiment

Rust, D. M.,Bernasconi, P. N.,Eaton, H. A.,Keller, C.,Murphy, G. A.,Schmieder, B.,

May 2000
American Astronomical Society, SPD Meeting #31, id.03.02; Bulletin of the American Astronomical Society, Vol. 32, p.834

Evolution of small-scale magnetic fields from combined adaptive optics and phase-diverse speckle imaging

Keller, C. U.,Rimmele, T. R.,Paxman, R. G.,Seldin, J. H.,Carrara, D.,Gleichman, K.,

May 2000
American Astronomical Society, SPD Meeting #31, id.03.01; Bulletin of the American Astronomical Society, Vol. 32, p.833

Anomalous polarization effects due to coherent scattering on the Sun

Stenflo, J. O.,Keller, C. U.,Gandorfer, A.,

Mar 2000
Astronomy and Astrophysics, v.355, p.789-803 (2000)

Center-to-limb variation of the enigmatic Na bt I D_1 and D_2 polarization profiles

Stenflo, J. O.,Gandorfer, A.,Keller, C. U.,

Mar 2000
Astronomy and Astrophysics, v.355, p.781-788 (2000)

5,000 by 5,000 Spatial by 15,000 Spectral Resolution Elements: First Astronomical Observations with a Novel 3-D Detector

Keller, C. U.,

n/a 2000
Imaging the Universe in Three Dimensions. Proceedings from ASP Conference Vol. 195. Edited by W. van Breugel and J. Bland-Hawthorn. ISBN: 1-58381-022-6 (2000), p.495

Deconvolution of narrowband solar images using aberrations estimated from phase-diverse imagery

Seldin, John H.,Paxman, Richard G.,Carrara, David A.,Keller, Christoph U.,Rimmele, Thomas R.,

Sep 1999
Proc. SPIE Vol. 3815, p. 155-163, Digital Image Recovery and Synthesis IV, Timothy J. Schulz; Paul S. Idell; Eds.

Infrared lines as probes of solar magnetic features. XV. Evershed flow in cool, weak penumbral fields

Rüedi, I.,Solanki, S. K.,Keller, C. U.,

Aug 1999
Astronomy and Astrophysics, v.348, p.L37-L40 (1999)

Scattering polarization in the chromosphere

Keller, C. U.,Sheeley, N. R., Jr.,

n/a 1999
Solar polarization : proceedings of an international workshop held in Bangalore, India, 12-16 October, 1998 / edited by K.N. Nagendra and J.O. Stenflo. Boston, Mass. : Kluwer Academic Publishers, 1999. (Astrophysics and space science library ; v. 243), p.17-30

Optimum Apodization for Speckle Imaging of Extended Sources

Keller, C.,

n/a 1999
High Resolution Solar Physics: Theory, Observations, and Techniques, ASP Conference Series #183. Eds. T. R. Rimmele, K. S. Balasubramaniam, and R. R. Radick. ISBN: 1-58381-009-9 (1999), p.342

Phase-Diversity Data Sets and Processing Strategies

Paxman, R.,Seldin, J.,Keller, C.,

The Advanced Solar Telescope: I. Science Goals

Keller, C.,

Infrared lines as probes of solar magnetic features. XIV. TI i and the cool components of sunspots

Rueedi, I.,Solanki, S. K.,Keller, C. U.,Frutiger, C.,

Oct 1998
Astronomy and Astrophysics, v.338, p.1089-1101 (1998)

SOLIS: a modern facility for synoptic solar observations

Keller, Christoph U.,

Aug 1998
Proc. SPIE Vol. 3352, p. 732-741, Advanced Technology Optical/IR Telescopes VI, Larry M. Stepp; Ed.

SOLIS: A Modern Facility for Synoptic Solar Observations

Keller, C. U.,

Mar 1998
Technical Report, Conference 3352: Astronomical Telescopes and Instrumentation

Complex magnetic fields in an active region

Bernasconi, P. N.,Keller, C. U.,Solanki, S. K.,Stenflo, J. O.,

Jan 1998
Astronomy and Astrophysics, v.329, p.704-720 (1998)

Differential Hanle effect and the spatial variation of turbulent magnetic fields on the Sun

Stenflo, J. O.,Keller, C. U.,Gandorfer, A.,

Jan 1998
Astronomy and Astrophysics, v.329, p.319-328 (1998)

Asteroseismology from equivalent widths: a test of the sun

Keller, C. U.,Harvey, J. W.,Barden, S. C.,Giampapa, M. S.,Hill, F.,Pilachowski, C. A.,

n/a 1998
International Astronomical Union. Symposium no. 185. New Eyes to See Inside the Sun and Stars, edited by Franz-Ludwig Deubner, Joergen Christensen-Dalsgaard, and Don Kurtz. Kyoto, Japan, 18-22 August, 1997, p. 375.

The Procyon campaign: Observations from Kitt Peak

Pilachowski, C. A.,Barden, S.,Hill, F.,Harvey, J. W.,Keller, C. U.,Giampapa, M. S.,

SOLIS --- A Modern Facility for Synoptic Solar Observations

Keller, C. U.,Nso Staff,

n/a 1998
ASP Conf. Ser. 154, The Tenth Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, Edited by R. A. Donahue and J. A. Bookbinder, p.636

SOLIS Instrumentation Aspects

Keller, C. U.,NSO Staff,

n/a 1998
Synoptic Solar Physics -- 18th NSO/Sacramento Peak Summer Workshop held at Sunspot; New Mexico 8-12 September 1997. ASP Conference Series; Vol. 140; 1998; ed. by K. S. Balasubramaniam; Jack Harvey; and D. Rabin, p.539

The USAF Improved Solar Observing Optical Network (ISOON) and its Impact on Solar Synoptic Data Bases

Neidig, D.,Wiborg, P.,Confer, M.,Haas, B.,Dunn, R.,Balasubramaniam, K. S.,Gullixson, C.,Craig, D.,Kaufman, M.,Hull, W.,McGraw, R.,Henry, T.,Rentschler, R.,Keller, C.,Jones, H.,Coulter, R.,Gregory, S.,Schimming, R.,Smaga, B.,

Center-to-limb variation of the second solar spectrum.

Stenflo, J. O.,Bianda, M.,Keller, C. U.,Solanki, S. K.,

Jun 1997
Astronomy and Astrophysics, v.322, p.985-994

Chromospheric Events in the Quiet Network

Keller, C.,Bastian, T.,Benz, A.,Krucker, S.,

May 1997
American Astronomical Society, SPD meeting #28, id.13.04; Bulletin of the American Astronomical Society, Vol. 29, p.917

ISOON: The Improved Solar Observing Optical Network

Neidig, D.,Confer, M.,Wiborg, P.,Dunn, R.,Balasubramaniam, K. S.,Frederick, R.,Kutzman, R.,Soli, R.,Keller, C.,Gullixson, C.,Alios, Inter,

May 1997
American Astronomical Society, SPD meeting #28, id.02.24; Bulletin of the American Astronomical Society, Vol. 29, p.897

The second solar spectrum. A new window for diagnostics of the Sun.

Stenflo, J. O.,Keller, C. U.,

May 1997
Astronomy and Astrophysics, v.321, p.927-934

Time series restoration from ground-based solar observations

Seldin, John H.,Paxman, Richard G.,Keller, Christoph U.,

Nov 1996
Proc. SPIE Vol. 2804, p. 166-174, Missions to the Sun, David M. Rust; Ed.

Flare Genesis Experiment

Murphy, Graham A.,Rust, David M.,Strohbehn, Kim,Eaton, Harry A.,Keil, Stephen L.,Keller, Christoph U.,Wiborg, P. H.,

Nov 1996
Proc. SPIE Vol. 2804, p. 141-152, Missions to the Sun, David M. Rust; Ed.

Concept for a miniature solar magnetograph

Keller, Christoph U.,Harvey, John W.,

Nov 1996
Proc. SPIE Vol. 2804, p. 14-17, Missions to the Sun, David M. Rust; Ed.

Observations of the quiet Sun's magnetic field.

Grossmann-Doerth, U.,Keller, C. U.,Schuessler, M.,

Nov 1996
Astronomy and Astrophysics, v.315, p.610-617

Evaluation of Phase-Diversity Techniques for Solar-Image Restoration

Paxman, Richard G.,Seldin, John H.,Loefdahl, Mats G.,Scharmer, Goeran B.,Keller, Christoph U.,

Aug 1996
Astrophysical Journal v.466, p.1087

Imaging Coronal Emission Lines under High Sky-Background Conditions

Keller, C. U.,Smartt, R. N.,

Jul 1996
Solar Physics, Volume 166, Issue 2, pp.311-315

Asteroseismology via equivalent widths - tests on Procyon, Eta Bootis, and Alpha Trianguli.

Harvey, J. W.,Pilachowski, C.,Barden, S.,Giampapa, M.,Keller, C. U.,Hill, F.,

May 1996
Bulletin of the Astronomical Society, Vol. 28, No. 2, p. 917

NIM-2 -- A Near Infrared Imaging Vector Magnetograph

Rabin, D.,Keller, C.,Jaksha, D.,

May 1996
American Astronomical Society, 188th AAS Meeting, id.67.06; Bulletin of the American Astronomical Society, Vol. 28, p.934

The Flare Genesis Experiment

Rust, D. M.,Murphy, G. A.,Strohbehn, K.,Keil, S. L.,Keller, C. U.,

May 1996
American Astronomical Society, 188th AAS Meeting, id.67.05; Bulletin of the American Astronomical Society, Vol. 28, p.934

SOLIS - A Modern Facility for Synoptic Solar Observations

Harvey, J.,Keller, C.,November, L.,NSO Staff,

May 1996
American Astronomical Society, 188th AAS Meeting, id.67.03; Bulletin of the American Astronomical Society, Vol. 28, p.934

Asteroseismology via Equivalent Widths -- Tests on Procyon, Eta Bootes, and Alpha Triangulum

Harvey, J.,Pilachowski, C.,Barden, S.,Giampapa, M.,Keller, C.,Hill, F.,

May 1996
American Astronomical Society, 188th AAS Meeting, id.59.03; Bulletin of the American Astronomical Society, Vol. 28, p.917

The Second Solar Spectrum

Keller, C. U.,Stenflo, J. O.,

May 1996
American Astronomical Society, 188th AAS Meeting, id.57.04; Bulletin of the American Astronomical Society, Vol. 28, p.912

Balloon-Borne Polarimetry

Rust, D. M.,Murphy, G.,Strohbehn, K.,Keller, C. U.,

Mar 1996
Solar Physics, Volume 164, Issue 1-2, pp. 403-415

Measurement of the full Stokes vector of He I 10830 Å

Rüedi, I.,Keller, C. U.,Solanki, S. K.,

Mar 1996
Solar Physics, Volume 164, Issue 1-2, pp. 265-275

Recent Progress in Imaging Polarimetry

Keller, C. U.,

Mar 1996
Solar Physics, Volume 164, Issue 1-2, pp. 243-252

Direct measurements of flux tube inclinations in solar plages.

Bernasconi, P. N.,Keller, C. U.,Povel, H. P.,Stenflo, J. O.,

Oct 1995
Astronomy and Astrophysics, v.302, p.533

Handling of huge multispectral image data volumes from a spectral hole burning device (SHBD)

Graff, Werner,Rosselet, Armel C.,Wild, Urs P.,Gschwind, Rudolf,Keller, Christoph U.,

Jun 1995
Proc. SPIE Vol. 2480, p. 445-452, Imaging Spectrometry, Michael R. Descour; Jonathan M. Mooney; David L. Perry; Luanna R. Illing; Eds.

Persistent spectral hole burning used for spectrally high-resolved imaging of the sun

Rosselet, Armel C.,Graff, Werner,Wild, Urs P.,Keller, Christoph U.,Gschwind, Rudolf,

Jun 1995
Proceedings of the SPIE, Volume 2480, p. 205-212 (1995).

Speckle spectrography of extended objects.

Keller, C. U.,Johannesson, A.,

May 1995
Astronomy and Astrophysics Supplement, v.110, p.565

Weak Magnetic Fields in the Network

Keller, C. U.,Harvey, J. W.,

Mar 1995
American Astronomical Society, SPD Meeting #26, id.2.06; Bulletin of the American Astronomical Society, Vol. 27, p. 952

The spectral hole-burning device: a 3-dimensional photon detector.

Keller, C. U.,Gschwind, R.,Renn, A.,Rosselet, A.,Wild, U. P.,

Feb 1995
Astronomy and Astrophysics Suppl., Vol. 109, p.383-387 (1995)

Properties of Solar Magnetic Fields from Speckle Polarimetry. (Ludwig Biermann Award Lecture 1994)

Keller, Ch. U.,

n/a 1995
Reviews in Modern Astronomy, v. 8, (1995), p. 27-60.

LEST detector and data acquisition systems.

Collados, M.,Keller, C. U.,Steiner, P.,

n/a 1995
LEST Foundation, Technical Report, No. 61,

Visible and near-infrared polarimetry with LEST.

Keller, C. U.,Bernasconi, P. N.,Egger, U.,Povel, H. P.,Steiner, P.,Stenflo, J. O.,

n/a 1995
LEST Foundation, Technical Report, No. 59,

Visible and Near Infrared Polarimetry with lest

Keller, C. U.,Bernasconi, P. N.,Egger, U.,Powel, H. P.,Steiner, P.,Stenflo, J. O.,

n/a 1995
LEST FOUNDATION TECHNICAL REPORT NO. 59, 1995

Lest Detector and Data Acquisition System - Part One - Specifications

Collados, M.,Keller, C. U.,Steiner, P.,

n/a 1995
LEST FOUNDATION TECHNICAL REPORT NO. 61, 1995

Infrared Capabilities of the Large Earth-Based Solar Telescope (LEST)

Keller, C. U.,

n/a 1995
Infrared tools for solar astrophysics: What's next? Proceedings of the 15th National Solar Observatory/Sacramento Peak Summer Workshop, Sunspot, New Mexico, USA, 19-22 September 1994. Edited by Jeffrey R. Kuhn and Matthew J. Penn. Singapore: World Scientific, 1995., p.215

Diffraction-limited slit spectrography

Keller, Christoph U.,

Sep 1994
Proceedings of the SPIE, Volume 2302, p. 293-299 (1994).

Zurich Imaging Stokes polarimeters I and II

Keller, Christoph U.,Povel, Hans-Peter,Stenflo, Jan O.,

Sep 1994
Proceedings of the SPIE, Volume 2265, p. 222-230 (1994).

First light for an astronomical 3-D photon detector

Keller, C. U.,Graff, W.,Rosselet, A.,Gschwind, R.,Wild, U. P.,

Sep 1994
Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 3, p. L41-L42

Two-dimensional polarimeter with a charge-coupled-device image sensor and a piezoelastic modulator

Povel, H. P.,Keller, C. U.,Yadigaroglu, I.-A.,

Jul 1994
Applied Optics, Volume 33, Issue 19, July 1, 1994, pp.4254-4260

Application of multiframe iterative blind deconvolution for diverse astronomical imaging

Christou, Julian C.,Hege, E. Keith,Jefferies, Stuart M.,Keller, Christoph U.,

Jun 1994
Proc. SPIE Vol. 2200, p. 433-444, Amplitude and Intensity Spatial Interferometry II, James B. Breckinridge; Ed.

On the strength of solar intra-network fields

Keller, C. U.,Deubner, F.-L.,Egger, U.,Fleck, B.,Povel, H. P.,

Jun 1994
Astronomy and Astrophysics (ISSN 0004-6361), vol. 286, no. 2, p. 626-634

High spatial resolution observations of solar magnetic fields

Keller, C. U.,

n/a 1994
Solar Magnetic Fields, Proceedings of the international conference held in Freiburg, Germany, June 29-July 2, 1993. Edited by Manfred Schüssler and Wolfgang Schmidt. Cambridge: Cambridge University Press, 1994., p.325

Direct Measurements of Fluxtube Inclinations in Plages

Bernasconi, Pietro N.,Keller, Christoph U.,Stenflo, Jan Olof,

n/a 1994
Solar active region evolution: comparing models with observations. Astronomical Society of the Pacific Conference Series, volume 68, Proceedings of the Fourteenth (14th) International Summer Workshop, National Solar Observatory / Sacramento Peak, Sunspot, New Mexico, USA, 30 August - 3 September 1993, San Francisco: Astronomical Society of the Pacific (ASP), |c1994, edited by K. S. Balasubramaniam and George W. Simon., p.131

Speckle techniques for spectroscopic observations

Keller, C. U.,

n/a 1994
Solar Surface Magnetism. NATO Advanced Study Institute (ASI) Series C: Mathematical and Physical Sciences, Proceedings of the NATO Advanced Research Workshop, held Soesterberg, the Netherlands, November 1-5, 1993, Edited by Robert J. Rutten and Carolus J. Schrijver. Dordrecht: Kluwer Academic Publishers, 1994., p.43

Some aspects of polarimetry with LEST

Keller, C. U.,

n/a 1994
Solar Surface Magnetism. NATO Advanced Science Institutes (ASI) Series C: Mathematical and Physical Sciences, Proceedings of the NATO Advanced Research Workshop, held Soesterberg, the Netherlands, November 1-5, 1993, Edited by Robert J. Rutten and Carolus J. Schrijver. Dordrecht: Kluwer Academic Publishers, 1994., p.37

Narrow-Band Speckle Imaging

Keller, C.,von der Lühe, O.,

Dec 1993
Real Time and Post Facto Solar Image Correction, Proceedings of the 13th National Solar Observatory/Sacramento Peak Summer Workshop, NSO/SP summer workshop, Sunspot New Mexico 15-18 September 1992 edited by Richard R. Radick., p.129

Small-Scale Structure in Active Regions (Invited)

Keller, C.,

Jan 1993
The magnetic and velocity fields of solar active regions. Astronomical Society of the Pacific Conference Series; Proceedings of the International Astronomical Union (IAU) Colloquium no. 141; held in Beijing; China; 6-12 September 1992; San Francisco: Astronomical Society of the Pacific (ASP), Volume. 46; |c1993; edited by Harold Zirin, Gouxiang Ai, and Haimin Wang, p.3

Resolution of magnetic flux tubes on the sun

Keller, C. U.,

Sep 1992
Nature (ISSN 0028-0836), vol. 359, no. 6393, p. 307, 308.

Solar speckle polarimetry

Keller, C. U.,von der Luehe, O.,

Jul 1992
Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 1, p. 321-328.

Application of Differential Speckle Imaging to Solar Polarimetry

Keller, C. U.,von der Luhe, O.,

Mar 1992
ESO Conference on High-Resolution Imaging by Interferometry II. Ground-Based Interferometry at Visible and Infrared Wavelengths, Proceedings, held in Garching bei Munchen, Germany, October 15-18, 1991. Editors, J.M. Beckers, F. Merkle; Publisher, European Southern Observatory, Garching bei Munchen, Germany, 1992. LC # QB51.3.E43 N6 1991 pt.1. ISBN # 3923524420 P. 453, 1992

High Spatial Resolution Magnetograms of Solar Active Regions

Keller, C. U.,Stenflo, J. O.,von der Luhe, O.,

Feb 1992
Astronomy and Astrophysics, Vol.254, NO. FEB(I), P. 355, 1992

Demodulation of all four Stokes parameters with a single CCD - ZIMPOL II. Conceptual design.

Stenflo, J. O.,Keller, C. U.,Povel, H. P.,

n/a 1992
LEST Foundation, Technical Report, No. 54,

Zürich Imaging Stokes Polarimeter - ZIMPOL I. Design review.

Keller, C. U.,Aebersold, F.,Egger, U.,Povel, H. P.,Steiner, P.,Stenflo, J. O.,

n/a 1992
LEST Foundation, Technical Report, No. 53,

Round table discussion.

Darvann, T. A.,Keller, C. U.,

n/a 1992
LEST Mini-Workshop on Software for Solar Image Processing, p. 131

GAP: yet another image processing system for solar observations.

Keller, C. U.,

n/a 1992
LEST Mini-Workshop on Software for Solar Image Processing, p. 3 - 17

Zurich Imaging Stokes Polarimeter Zimpol-I - Design Review

Keller, C. U.,Aebersold, F.,Egger, U.,Povel, H. P.,Steiner, P.,Stenflo, J. O.,

n/a 1992
LEST FOUNDATION. TECHNICAL REPORT NO. 53, 1992

Multicolor continuum analysis of the solar granulation in quiet and active regions

Keller, C. U.,Koutchmy, S.,

Oct 1991
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Oct. 1, 1991, p. 751-757.

Fine-Scale Magnetic Field in a Sunspot Penumbra and Adjacent Photosphere

Frank, Z. A.,Scharmer, G. B.,Keller, C.,Lundstedt, H.,

Mar 1991
Bulletin of the American Astronomical Society, Vol. 23, p.1052

Inversion of Stokes V profiles: The structure of solar magnetic fluxtubes and its dependence on the filling factor.

Keller, C. U.,Solanki, S. K.,Stenflo, J. O.,Zayer, I.,

Jan 1991
Solar Polarimetry, Proceedings of the 11th Sacramento Peak Summper Workshop. Edited by L.J. November. Sunspot, NM: National Solar Observatory, 1991, p. 387 - 392

High spatial resolution polarimetry using filtergrams.

Keller, C. U.,

Jan 1991
Solar Polarimetry, Proceedings of the 11th Sacramento Peak Summper Workshop. Edited by L.J. November. Sunspot, NM: National Solar Observatory, 1991, p. 124 - 132

Two-dimensional polarimeter with CCD image sensors and piezo-elastic modulators.

Povel, H. P.,Keller, C. U.,Stenflo, J. O.,

Jan 1991
Solar Polarimetry, Proceedings of the 11th Sacramento Peak Summper Workshop. Edited by L.J. November. Sunspot, NM: National Solar Observatory, 1991, p. 100 - 112

Dependence of the properties of solar magnetic flux tubes on filling factor. II - Results of an inversion approach

Zayer, I.,Stenflo, J. O.,Keller, C. U.,Solanki, S. K.,

Nov 1990
Astronomy and Astrophysics (ISSN 0004-6361), vol. 239, no. 1-2, Nov. 1990, p. 356-366.

Solar magnetic field strength determinations from high spatial resolution filtergrams

Keller, C. U.,Stenflo, J. O.,Solanki, S. K.,Tarbell, T. D.,Title, A. M.,

Sep 1990
Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 1, Sept. 1990, p. 250-255.

Structure of solar magnetic fluxtubes from the inversion of Stokes spectra at disk center

Keller, C. U.,Steiner, O.,Stenflo, J. O.,Solanki, S. K.,

Jul 1990
Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 2, July 1990, p. 583-597.

Empirical Photospheric Fluxtube Models from Inversion of Stokes V Data

Keller, C. U.,

n/a 1990
Solar Photosphere: Structure, Convection, and Magnetic Fields: Proceedings of the 138th Symposium of the International Astronomical Union, held in Kiev, U.S.S.R., May 15-20, 1989. Edited by Jan Olof Stenflo. International Astronomical Union. Symposium no. 138, Kluwer Academic Publishers, Dordrecht, p.121

High resolution photographic Stokes polarimetry of small scale magnetic flux (poster)

Keller, C. U.,Koutchmy, S.,

Aug 1989
High spatial resolution solar observations, Proceedings of the 10th Sacramento Peak Summer Workshop, Sunspot, New Mexico, August 22-26, 1988. Edited by Oskar von der Lühe. Sunspot, MN: National Solar Observatory, 1989., p.443

Restoration of distorted images as a variational problem: a dynamic programming approach

Keller, C. U.,

Properties of solar magnetic fluxtubes from only two spectral lines

Solanki, S. K.,Keller, C.,Stenflo, J. O.,

Dec 1987
Astronomy and Astrophysics (ISSN 0004-6361), vol. 188, no. 1, Dec. 1987, p. 183-197.