9:15 AM - 9:30 AM
[PAE20-02] Radial migration of gap-opening planets in protoplanetary disks
Keywords:Disk-planet interaction, Protoplanetary disk, Type II migration
We have found that the torque exerted on the gap-opening planet is proportional to the surface density at the bottom of the gap. Hence its migration slows down as the gap becomes deeper and wider. Using the gap model developed in our previous studies, we have constructed an empirical formula of the migration speed of the gap-opening planets, which is consistent with the results obtained before in the hydrodynamic simulations performed by us and other researchers. Our model easily explains why the migration speed of the gap-opening planets can be faster than the viscous gas drift speed. Our model can also predict the planet mass at which the transition from type I to type II migrations occurs and provide a gap-opening criterion in terms of planetary migration.