Planetary Migration in Resonance, the question of the Eccentricities : Les Houches contribution

Details Planetary Migration in Resonance, the question of the Eccentricities : Les Houches contribution Planetary Migration in Resonance, the question of the Eccentricities : Les Houches contribution

2008-07-17

arxiv.org/abs/0807.2828v2

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure. To appear in the proceedings of the Les Houches Winter School "Physics and Astrophysics of Planetary System

Scientific paper

The formation of resonant planets pairs in exoplanetary systems involves planetary migration inside the protoplanetary disc : an inwards migrating outer planet captures in Mean Motion Resonance an inner planet. During the migration of the resonant pair of planets, the eccentricities are expected to rise excessively, if no damping mechanism is applied on the inner planet. We express the required damping action to match the observations, and we show that the inner disk can play this role. This result applies for instance to the system GJ 876 : we reproduce the observed orbital elements through a fully hydrodynamical simulation of the evolution of the resonant planets.

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