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Title:
Detectability of quasi-circular co-orbital planets. Application to the radial velocity technique
Authors:
Leleu, Adrien; Robutel, Philippe; Correia, Alexandre C. M.
Affiliation:
AA(ASD, IMCCE-CNRS UMR8028, Observatoire de Paris, UPMC, 77 Av. Denfert-Rochereau, 75014, Paris, France ), AB(ASD, IMCCE-CNRS UMR8028, Observatoire de Paris, UPMC, 77 Av. Denfert-Rochereau, 75014, Paris, France), AC(ASD, IMCCE-CNRS UMR8028, Observatoire de Paris, UPMC, 77 Av. Denfert-Rochereau, 75014, Paris, France; CIDMA, Departamento de Física, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal)
Publication:
Astronomy & Astrophysics, Volume 581, id.A128, 14 pp. (A&A Homepage)
Publication Date:
09/2015
Origin:
EDP Sciences
Astronomy Keywords:
planets and satellites: detection, planets and satellites: dynamical evolution and stability, celestial mechanics
DOI:
10.1051/0004-6361/201526175
Bibliographic Code:
2015A&A...581A.128L

Abstract

Several celestial bodies in co-orbital configurations exist in the solar system. However, co-orbital exoplanets have not yet been discovered. This lack may result from a degeneracy between the signal induced by co-orbital planets and other orbital configurations. Here we determine a criterion for the detectability of quasi-circular co-orbital planets and develop a demodulation method to bring out their signature from the observational data. We show that the precision required to identify a pair of co-orbital planets depends only on the libration amplitude and on the planet's mass ratio. We apply our method to synthetic radial velocity data, and show that for tadpole orbits we are able to determine the inclination of the system to the line of sight. Our method is also valid for planets detected through the transit and astrometry techniques.
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