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

M. 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. C. Santos, M. Stalport, D. Ségransan, S. Udry, P. A. Wilson

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, although the high eccentricity of Gl96 b may take it too close to the star at periapsis.

Keywords
techniques: radial velocities, planetary systems, stars: late-type, stars: individual: Gl617A, stars: individual: Gl96

Notes
Based on observations collected with the SOPHIE spectrograph on the 1.93 m telescope at the Observatoire de Haute-Provence (CNRS), France, by the SOPHIE Consortium.

Astronomy and Astrophysics
Volume 618, Article Number A103, Number of pages 15
2018 October

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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