How does disk gravity really influence type-I migration ?

Abstract

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.

4 pages, accepted for publication in A&A Letters

References in corpus (4)

• Nested-grid calculations of disk-planet interaction
• Stopping inward planetary migration by a toroidal magnetic field
• On the Early Evolution of Forming Jovian Planets I: Initial Conditions, Systematics and Qualitative Comparisons to Theory
• On the Early Evolution of Forming Jovian Planets II: Analysis of Accretion and Gravitational Torques

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