A pair of planets around HD 202206 or a circumbinary planet?
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Astrophysics, abstract
astro-ph/0411512
From: Alexandre Correia [view email]
Date (v1): Wed, 17 Nov 2004 20:35:44 GMT (412kb)
Date (revised v2): Sun, 12 Jun 2005 22:42:57 GMT (816kb)
A pair of planets around HD 202206 or a circumbinary planet?
Authors:
A.C.M. Correia,
S. Udry,
M. Mayor,
J. Laskar,
D. Naef,
F. Pepe,
D. Queloz,
N.C. Santos
Comments: 9 pages, 14 figures, accepted in A&A, 12-May-2005
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\sini = 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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