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Title: Detection of co-orbital planets by combining transit and radial-velocity measurements
Author: Leleu, A.
Robutel, P.
Correia, A. C. M.
Lillo-Box, J.
Keywords: Celestial mechanics
Planetary systems
Planets and satellites: detection
Techniques: photometric
Techniques: radial velocities
Issue Date: Mar-2017
Publisher: EDP sciences
Abstract: 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. © 2017 ESO.
Peer review: yes
DOI: 10.1051/0004-6361/201630073
ISSN: 0004-6361
Appears in Collections:CIDMA - Artigos
DFis - Artigos
GGDG - Artigos

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