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The SOPHIE search for northern extrasolar planets. II. A multi-planet system around HD9446

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arxiv 1001.0682 v1 pith:J4SDCWZJ submitted 2010-01-05 astro-ph.EP

The SOPHIE search for northern extrasolar planets. II. A multi-planet system around HD9446

G. Hebrard , X. Bonfils , D. Segransan , C. Moutou , X. Delfosse , F. Bouchy , I. Boisse , L. Arnold
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M. Desort R.F. Diaz A. Eggenberger D. Ehrenreich T. Forveille A.-M. Lagrange C. Lovis F. Pepe C. Perrier F. Pont D. Queloz N.C. Santos S. Udry A. Vidal-Madjar
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keywords orbitarounddayshd9446massminimummulti-planetperiod
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We report the discovery of a planetary system around HD9446, performed from radial velocity measurements secured with the spectrograph SOPHIE at the 193-cm telescope of the Haute-Provence Observatory during more than two years. At least two planets orbit this G5V, active star: HD9446b has a minimum mass of 0.7 M_Jup and a slightly eccentric orbit with a period of 30 days, whereas HD9446c has a minimum mass of 1.8 M_Jup and a circular orbit with a period of 193 days. As for most of the known multi-planet systems, the HD9446-system presents a hierarchical disposition, with a massive outer planet and a lighter inner planet.

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