Letter to the Editor
How does disk gravity really influence type-I migration?
LUTh, CNRS UMR 8102, Observatoire de Paris-Meudon, Place Jules Janssen, 92195 Meudon Cedex, France e-mail: email@example.com
2 Université Paris 7 Denis Diderot, 2 Place Jussieu, 75251 Paris Cedex 05, France
Accepted: 18 February 2005
We report an analytical expression for the locations of Lindblad resonances induced by a perturbing protoplanet, including the effect of disk gravity. Inner, outer and differential torques are found to be enhanced compared to situations where a keplerian velocity field for the dynamics of both the disk and the planet is assumed. Inward migration is strongly accelerated when the disk gravity is only accounted for in the planet orbital motion. The addition of disk self-gravity slows down the planet drift but not enough to stop it.
© ESO, 2005