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Title:
Detection of co-orbital planets by combining transit and radial-velocity measurements
Authors:
Leleu, A.; Robutel, P.; Correia, A. C. M.; Lillo-Box, J.
Affiliation:
AA(Physikalisches Institut & Center for Space and Habitability, Universitaet Bern, 3012, Bern, Switzerland ; IMCCE, Observatoire de Paris - PSL Research University, UPMC Univ. Paris 06, Univ. Lille 1, CNRS, 77 Avenue Denfert-Rochereau, 75014, Paris, France; ), AB(IMCCE, Observatoire de Paris - PSL Research University, UPMC Univ. Paris 06, Univ. Lille 1, CNRS, 77 Avenue Denfert-Rochereau, 75014, Paris, France), AC(IMCCE, Observatoire de Paris - PSL Research University, UPMC Univ. Paris 06, Univ. Lille 1, CNRS, 77 Avenue Denfert-Rochereau, 75014, Paris, France; CIDMA, Departamento de Física, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal), AD(European Southern Observatory, Alonso de Cordova 3107, Vitacura Casilla 19001, Santiago 19, Chile)
Publication:
Astronomy & Astrophysics, Volume 599, id.L7, 4 pp. (A&A Homepage)
Publication Date:
03/2017
Origin:
EDP Sciences
Astronomy Keywords:
planets and satellites: detection, celestial mechanics, planetary systems, techniques: radial velocities, techniques: photometric
DOI:
10.1051/0004-6361/201630073
Bibliographic Code:
2017A&A...599L...7L

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 alpha, which is proportional to the mass ratio m2/m1. Therefore, when alpha 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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