The SOPHIE search for northern extrasolar planets XV. A Warm Neptune around the M-dwarf Gl378

M. J. Hobson (1) , X. Delfosse (2) , N. Astudillo-Defru (3) , I. Boisse (1) , R. F. D\'iaz (4 , 5) , F. Bouchy (6) , X.Bonfils (2)

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T. Forveille (2) L.Arnold (7) S. Borgniet (2) V. Bourrier (6) B. Brugger (1) N. Cabrera Salazar (2) B. Courcol (1) S. Dalal (8) M. Deleuil (1) O.Demangeon (9) X. Dumusque (6) N. Hara (6 11) G. H\'ebrard (8 7) F. Kiefer (8) T. Lopez (1) L. Mignon (2) G. Montagnier (8 O. Mousis (1) C. Moutou (1 12) F. Pepe (6) J. Rey (6) A. Santerne (1) N. C. Santos (9 10) M. Stalport (6) D. S\'egransan (6) S. Udry (6) P. A. Wilson (13 14 8) ((1) Aix Marseille Univ CNRS CNES LAM Marseille France (2) Univ. Grenoble Alpes IPAG Grenoble (3) Universidad de Concepci\'on Departamento de Astronom\'ia Concepci\'on Chile (4) Universidad de Buenos Aires Facultad de Ciencias Exactas y Naturales. Buenos Aires Argentina (5) CONICET - Universidad de Buenos Aires. Instituto de Astronom\'ia y F\'isica del Espacio (IAFE). Buenos Aires (6) Observatoire Astronomique de l'Universit\'e de Gen\`eve Versoix Switzerland (7) Observatoire de Haute-Provence Aix Marseille Universit\'e Institut Pyth\'eas UMS 3470 Saint-Michel-l'Observatoire (8) Institut d'Astrophysique de Paris UMR7095 CNRS Universit\'e Pierre & Marie Curie Paris (9) Instituto de Astrof\'isica e Ci\^encias do Espa\c{c}o Universidade do Porto CAUP Porto Portugal (10) Departamento de F\'isica e Astronomia Faculdade de Ci\^encias (11) ASD/IMCCE CNRS-UMR8028 Observatoire de Paris PSL UPMC (12) Canada-France-Hawaii Telescope Corporation Kamuela HI USA (13) Department of Physics University of Warwick Coventry UK (14) Centre for Exoplanets Habitability Coventry CV4 7AL UK)

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classification 🌌 astro-ph.EP

keywords gl378planetsaroundneptunesophiem-dwarfm-dwarfsplanet

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We present the detection of a Warm Neptune orbiting the M-dwarf Gl378, using radial velocity measurements obtained with the SOPHIE spectrograph at the Observatoire de Haute-Provence. The star was observed in the context of the SOPHIE exoplanets consortium's subprogramme dedicated to finding planets around M-dwarfs. Gl378 is an M1 star, of solar metallicity, at a distance of 14.96 pc. The single planet detected, Gl378 b, has a minimum mass of 13.02 $\rm M_{Earth}$ and an orbital period of 3.82 days, which place it at the lower boundary of the Hot Neptune desert. As one of only a few such planets around M-dwarfs, Gl378 b provides important clues to the evolutionary history of these close-in planets. In particular, the eccentricity of 0.1 may point to a high-eccentricity migration. The planet may also have lost part of its envelope due to irradiation.

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The SOPHIE search for northern extrasolar planets XV. A Warm Neptune around the M-dwarf Gl378

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