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Article Dans Une Revue Celestial Mechanics and Dynamical Astronomy Année : 2021

An analytical model for tidal evolution in co-orbital systems. I. Application to exoplanets

Résumé

Close-in co-orbital planets (in a 1:1 mean motion resonance) can experience strong tidal interactions with the central star. Here, we develop an analytical model adapted to the study of the tidal evolution of those systems. We use a Hamiltonian version of the constant time-lag tidal model, which extends the Hamiltonian formalism developed for the point-mass case. We show that co-orbital systems undergoing tidal dissipation either favour the Lagrange or the anti-Lagrange configurations, depending on the system parameters. However, for all range of parameters and initial conditions, both configurations become unstable, although the timescale for the destruction of the system can be larger than the lifetime of the star. We provide an easy-to-use criterion to determine if an already known close-in exoplanet may have an undetected co-orbital companion.

Dates et versions

hal-03370265 , version 1 (07-10-2021)

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Jérémy Couturier, Philippe Robutel, Alexandre Correia. An analytical model for tidal evolution in co-orbital systems. I. Application to exoplanets. Celestial Mechanics and Dynamical Astronomy, 2021, 133 (8), pp.37. ⟨10.1007/s10569-021-10032-w⟩. ⟨hal-03370265⟩
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