The CORALIE survey for southern extra-solar planets. XIII. A pair of planets around HD 202206 or a circumbinary planet? - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2005

The CORALIE survey for southern extra-solar planets. XIII. A pair of planets around HD 202206 or a circumbinary planet?

Résumé

Long-term precise Doppler measurements with the CORALIE spectrograph reveal the presence of a second planet orbiting the solar-type star HD 202206. The radial-velocity combined fit yields companion masses of m2sin i=17.4 MJup and 2.44 MJup, semi-major axes of a=0.83 AU and 2.55 AU, and eccentricities of e=0.43 and 0.27, respectively. A dynamical analysis of the system further shows a 5/1 mean motion resonance between the two planets. This system is of particular interest since the inner planet is within the brown-dwarf limits while the outer one is much less massive. Therefore, either the inner planet formed simultaneously in the protoplanetary disk as a superplanet, or the outer Jupiter-like planet formed in a circumbinary disk. We believe this singular planetary system will provide important constraints on planetary formation and migration scenarios.

Dates et versions

hal-03743066 , version 1 (02-08-2022)

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Alexandre C. M. Correia, Stéphane Udry, Michel Mayor, Jacques Laskar, Dominique Naef, et al.. The CORALIE survey for southern extra-solar planets. XIII. A pair of planets around HD 202206 or a circumbinary planet?. Astronomy and Astrophysics - A&A, 2005, 440, pp.751-758. ⟨10.1051/0004-6361:20042376⟩. ⟨hal-03743066⟩
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