Planet Formation: Terrestrial and Extra Solar

Coordinators: Douglas N.C. Lin, Jonathan Lunine, Norman Murray

The recent discoveries of extrasolar planets(now numbering around 100), combined with recently obtained observational upper limits on the lifetimes of protoplanetary disks, make this an ideal time to rethink how planets form. This program will examine the formation process from dust grains to planetesimals, from planetesimals to Earth mass bodies or multiple-Earth mass cores, and from cores to gas giant planets. It will also consider post-formation evolution, e.g., planet-disk interactions, in an attempt to understand both the very short orbital periods of many of the extrasolar planets, and their often large eccentricities.