Journal
ASTRONOMY & ASTROPHYSICS
Volume 440, Issue 2, Pages 751-758Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20042376
Keywords
techniques : radial velocities; techniques : spectroscopic; stars : individual : HD202206; stars : binaries : general; stars : planetary systems
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Long-term precise Doppler measurements with the CORALIE spectrograph reveal the presence of a second planet orbiting the solar-type star HD202206. The radial-velocity combined fit yields companion masses of m(2) sin i = 17.4 M-Jup and 2.44 M-Jup, 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.
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