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26 April 2024

» arxiv » 1902.5998

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The SOPHIE search for northern extrasolar planets XV. A Warm Neptune around the M-dwarf Gl378
M. J. Hobson ; X. Delfosse ; N. Astudillo-Defru ; I. Boisse ; R. F. Díaz ; F. Bouchy ; X.Bonfils ; T. Forveille ; L.Arnold ; S. Borgniet ; V. Bourrier ; B. Brugger ; N. Cabrera Salazar ; B. Courcol ; S. Dalal ; M. Deleuil ; O.Demangeon ; X. Dumusque ; N. Hara ; 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 ;
Date:	15 Feb 2019
Abstract:	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 $ m 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.
Source:	arXiv, 1902.5998
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