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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 Salazar, B. Courcol, S. Dalal, M. Deleuil, O. Demangeon, X. Dumusque, D. Ehrenreich, G. Hébrard, F. Kiefer, T. A. 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

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.

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

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

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