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arXiv · 1806.10958

The SOPHIE search for northern extrasolar planets XIII. Two planets around M-dwarfs Gl617A and Gl96

M. J. Hobson·R. F. Díaz·X. Delfosse·N. Astudillo-Defru·I. Boisse·F. Bouchy·X. Bonfils·T. Forveille·N. Hara·L. Arnold·S. Borgniet·V. Bourrier·B. Brugger·N. Cabrera·B. Courcol·S. Dalal·M. Deleuil·O. Demangeon·X. Dumusque·D. Ehrenreich·G. Hébrard·F. Kiefer·T. Lopez·L. Mignon·G. Montagnier·O. Mousis·C. Moutou·F. Pepe·J. Rey·A. Santerne·N. Santos·M. Stalport·D. Ségransan·S. Udry·P. A. Wilson
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Abstract

We report the detection of two exoplanets and a further tentative candidate around the M-dwarf stars Gl96 and Gl617A, based on radial velocity measurements obtained with the SOPHIE spectrograph at the Observatoire de Haute-Provence. Both stars were observed in the context of the SOPHIE exoplanet consortium's dedicated M-dwarf subprogramme, which aims to detect exoplanets around nearby M-dwarf stars through a systematic survey. For Gl96, we present the discovery of a new exoplanet at 73.9 d with a minimum mass of 19.66 earth masses. Gl96 b has an eccentricity of 0.44, placing it among the most eccentric planets orbiting M stars. For Gl617A we independently confirm a recently reported exoplanet at 86.7 d with a minimum mass of 31.29 earth masses. Both Gl96 b and Gl617A b are potentially within the habitable zone, though Gl96 b's high eccentricity may take it too close to the star at periapsis.

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M. J. Hobson, R. F. Díaz, X. Delfosse, N. Astudillo-Defru, I. Boisse, F. Bouchy, X. Bonfils, T. Forveille, N. Hara, L. Arnold, S. Borgniet, V. Bourrier, B. Brugger, N. Cabrera, B. Courcol, S. Dalal, M. Deleuil, O. Demangeon, X. Dumusque, D. Ehrenreich, G. Hébrard, F. Kiefer, T. Lopez, L. Mignon, G. Montagnier, O. Mousis, C. Moutou, F. Pepe, J. Rey, A. Santerne, N. Santos, M. Stalport, D. Ségransan, S. Udry, P. A. Wilson. 2018-06-28. The SOPHIE search for northern extrasolar planets XIII. Two planets around M-dwarfs Gl617A and Gl96. https://doi.org/10.1051/0004-6361%2F201832732

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