Volume 630, October 2019
|Number of page(s)||12|
|Section||Planets and planetary systems|
|Published online||26 September 2019|
Spin-orbit coupling for close-in planets
CFisUC, Department of Physics, University of Coimbra,
2 ASD, IMCCE, Observatoire de Paris, PSL Université, 77 Av. Denfert-Rochereau, 75014 Paris, France
3 Observatoire de l’Université de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
Accepted: 20 August 2019
We study the spin evolution of close-in planets in multi-body systems and present a very general formulation of the spin-orbit problem. This includes a simple way to probe the spin dynamics from the orbital perturbations, a new method for computing forced librations and tidal deformation, and general expressions for the tidal torque and capture probabilities in resonance. We show that planet–planet perturbations can drive the spin of Earth-size planets into asynchronous or chaotic states, even for nearly circular orbits. We apply our results to Mercury and to the KOI-1599 system of two super-Earths in a 3/2 mean motion resonance.
Key words: celestial mechanics / planets and satellites: general / chaos
© ESO 2019
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