Ingredients for planet formation

1) Rotating molecular cloud 2) Time

Need: prescription for planet migration which depends on the temperature and surface density gradients in the disk.

Compute T(R), Σ(R) and the molecular abundance of water and carbon dioxide, then compute the total torques on the planets (on map: blue = outward migration, red = inward migration). Torques give radial evolution of the forming planets (green lines).