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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2017

Detection of co-orbital planets by combining transit and radial-velocity measurements

Résumé

Co-orbital planets have not yet been discovered, although they constitute a frequent by-product of planetary formation and evolution models. This lack may be due to observational biases, since the main detection methods are unable to spot co-orbital companions when they are small or near the Lagrangian equilibrium points. However, for a system with one known transiting planet (with mass m1), we can detect a co-orbital companion (with mass m2) by combining the time of mid-transit with the radial-velocity data of the star. Here, we propose a simple method that allows the detection of co-orbital companions, valid for eccentric orbits, that relies on a single parameter α, which is proportional to the mass ratio m2/m1. Therefore, when α is statistically different from zero, we have a strong candidate to harbour a co-orbital companion. We also discuss the relevance of false positives generated by different planetary configurations.
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Dates et versions

hal-02202121 , version 1 (04-11-2020)

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A. Leleu, P. Robutel, A. Correia, J. Lillo-Box. Detection of co-orbital planets by combining transit and radial-velocity measurements. Astronomy and Astrophysics - A&A, 2017, 599, pp.L7. ⟨10.1051/0004-6361/201630073⟩. ⟨hal-02202121⟩
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