The CORALIE survey for southern extra-solar planets
Open Access
- 1 September 2005
- journal article
- Published by EDP Sciences in Astronomy & Astrophysics
- Vol. 440 (2) , 751-758
- https://doi.org/10.1051/0004-6361:20042376
Abstract
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 and , semi-major axes of AU and 2.55 AU, and eccentricities of 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.Keywords
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