RESEARCH
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The SOPHIE search for northern extrasolar planets
III. A Jupiter-mass companion around HD109 246

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

Abstract
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 HD109 246, a G0V star slightly more metallic than the Sun. HD109 246b has a minimum mass of 0.77 MJup, 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 (ν sin i, [Fe/H], log R'HK) directly from the SOPHIE data.

Keywords
planetary systems - techniques: radial velocities - stars: individual: HD109 246 - stars: activity - stars: abundances

Notes
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).

Astronomy and Astrophysics
Volume 523, Number of pages A88_1
2010 November

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia