EVOLUTION
OF ORGANIC MATTER IN SPACE
studied
on the International Space Station
Flight
Opportunity: 2004
Scientific
goal:
This
experiment studies the effects of UV radiation, low pressure and heavy
ion bombardment on organic molecules of astrophysical and exobiological
interest on the International
Space Station ISS. We shall prepare samples to be exposed on the EXPOSE
assembly mounted on the Space Station Express Pallet on the ISS. These
samples will include specific polycyclic aromatic hydrocarbons (PAHs),
fullerene compounds and different types of kerogens. PAHs are a highly
abundant and ubiquitous compound in the interstellar medium, and kerogens
represent analogues to organic extracts from carbonaceous meteorites, whose
isotopic composition is far from being understood. The spontaneous formation
and stability of fullerene compounds have suggested their existence in
relation to carbon dust. Our group has recently detected fingerprints of
interstellar fullerenes in astronomical spectra, indicating that fullerenes
may play an important role in interstellar chemistry.
Using
our expertise and available laboratory equipment we will subject the samples,
before and after exposure to space environment, to various chemical and
physical analysis: UV, visible, infrared, and fluorescence spectroscopy,
gas chromatography/mass-spectrometry (GC/MS), isotopic analysis, magic
angle spinning nuclear magnetic resonance (NMR) and Secondary-Ion-Mass-Spectrometry
(SIMS).
This
experiment will monitor the chemical evolution, survival, destruction and
chemical modification of PAHs, fullerenes, and macromolecules in space
environment. From the results we shall determine constraints on the photochemistry
of these compounds in the interstellar medium.
Since
PAHs, fullerenes and macromolecules are also present in meteorites the
obtained data are most relevant for the reconstruction of events in the
early Solar System. Also an ecological aspect can be addressed by investigating
the different stability of PAH isomers. The obtained results will be a
significant step to understand and model the evolution of organic matter
and their reaction products under the harsh conditions in interplanetary
or interstellar space.
Principal
Investigator:
Pascale
Ehrenfreund
Raymond
and Beverly Sackler Laboratory for
Astrophysics
at Leiden Observatory
P
O Box 9513
2300
RA Leiden
The
Netherlands
Tel:
(31) 715275812
Fax:
(31) 715275819
email:
pascale@strw.leidenuniv.nl
Co-Investigators:
Bernard
H. Foing
ESA,
Space Science Department, ESTEC, Noordwijk
Richard
Ruiterkamp
Leiden
Observatory, Leiden, The Netherlands
Werner
Schmidt
PAH
Forschungsinstitut, Greifenberg, Germany
Elmar
Jessberger
Inst.
für Planetologie der Westfälischen Wilhelms-Univ.Münster,
Germany
Farid
Salama
NASA
AMES RESEARCH Center, Mountainview, USA
Christian
Koeberl
Institut
für Geochemie, Universität Wien, Austria
Francois
Robert
Laboratoire
de Mineralogie, Museum CNRS, Paris, France
Michel
G. Breitfellner
ESA,
Satellite Tracking Station, Villafranca del Castillo, Madrid, Spain
Francoise
Behar
Geology
& Geochemestry Division Institut Francais du Petrole, Rueil-Malmaison,
France
Paule
Sonnentrucker
John
Hopkins University, Baltimore, USA |