The SOPHIE search for northern extrasolar planets. II. A multiple planet system around HD 9446

G. HÉBRARD; X. BONFILS; D. SÉGRANSAN; C. MOUTOU; X. DELFOSSE; F. BOUCHY; I. BOISSE; L. ARNOLD; M. DESORT; R. F. DÍAZ; 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

ASTRONOMY AND ASTROPHYSICS

EDP SCIENCES S A

Lugar: Paris; Año: 2010 vol. 513 p. 1 - 6

0004-6361

We report the discovery of a planetary system around HD 9446, performed from radial velocity measurements secured with the spectrograph SOPHIE at the 193-cm telescope of the Haute-Provence Observatory for more than two years. At least two planets orbit this G5V, active star: HD 9446b has a minimum mass of 0.7 MJup and a slightly eccentric orbit with a period of 30 days, whereas HD 9446c has a minimum mass of 1.8 MJup and a circular orbit with a period of 193 days. As for most of the known multiple planet systems, the HD 9446-system presents a hierarchical disposition with a massive outer planet and a lighter inner planet.