The SOPHIE search for northern extrasolar planets. III. A Jupiter-mass companion around HD 109246

I. Boisse (1) , A. Eggenberger (2) , N. C. Santos , C. Lovis , F. Bouchy (1) , G. Hébrard (1) , L. Arnold , X. Bonfils (2) , X. Delfosse (2) , M. Desort (2) , R. F. Díaz (1) , D. Ehrenreich (2) , T. Forveille (2) , A. Gallenne , A. M. Lagrange (2) , C. Moutou (3) , S. Udry , F. Pepe , C. Perrier (2) , S. Perruchot , F. Pont , D. Queloz , A. Santerne (3) , D. Ségransan , A. Vidal-Madjar (1)

1 IAP - Institut d'Astrophysique de Paris
2 LAOG - Laboratoire d'Astrophysique de Grenoble
3 LAM - Laboratoire d'Astrophysique de Marseille

We report the detection of a Jupiter-mass planet discovered with the SOPHIE spectrograph mounted on the 1.93-m telescope at the Haute-Provence Observatory. The new planet orbits HD 109246, a G0V star slightly more metallic than the Sun. HD 109246b has a minimum mass of 0.77 M_Jup, an orbital period of 68 days, and an eccentricity of 0.12. It is placed in a sparsely populated region of the period distribution of extrasolar planets. We also present a correction method for the so-called seeing effect that affects the SOPHIE radial velocities. We complement this discovery announcement with a description of some calibrations that are implemented in the SOPHIE automatic reduction pipeline. These calibrations allow the derivation of the photon-noise radial velocity uncertainty and some useful stellar properties (v sin i, [Fe/H], log R’_HK) directly from the SOPHIE data.

Based on observations made with the SOPHIE spectrograph on the 1.93-m telescope at Observatoire de Haute-Provence (CNRS/OAMP), France (program 07A.PNP.CONS).RV tables (Tables C.1 and C.2) are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/523/A88

Mots clés: planetary systems; techniques: radial velocities; stars: individual: HD 109246; stars: activity; stars: abundances; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics

Domaines: Planète et Univers [physics]

I. Boisse, A. Eggenberger, N. C. Santos, C. Lovis, F. Bouchy, et al.. The SOPHIE search for northern extrasolar planets. III. A Jupiter-mass companion around HD 109246. Astronomy and Astrophysics - A&A, 2010, 523, pp.A88. ⟨10.1051/0004-6361/201014909⟩. ⟨hal-03646025⟩