HR: 11:40h
AN: P32A-06    [Abstracts]
TI: On Type III Protoplanet Migration
AU: * Ward, W R
EM: ward@boulder.swri.edu
AF: Southwest Research Institute, 1050 Walnut St., Suite 400, Boulder, CO 80302 United States
AB: Planet migration due to disk torques from the corotation region (type III) is considered. There is a fast regime where the drift rate increases with the planet's mass and generally exceeds the type I migration rate, and a slow regime where the rate decreases with mass. The transition between these regimes or to type II motion is examined, and the range of validity of this migration mechanism explored. Type III migration depends on a sustained surface density deficit between material trapped in the corotation region and the ambient disk. Sufficient disk viscosity could suppress the motion by removing the deficit. Implications for the formation and survival of planets embedded in disks will be discussed.
DE: 5744 Orbital and rotational dynamics
DE: 5749 Origin and evolution
DE: 5759 Rings and dust
SC: Planetary Sciences [P]
MN: 2004 AGU Fall Meeting