The SOPHIE search for northern extrasolar planets

Abstract : We present the detection of a warm Neptune orbiting the M dwarf Gl 378, 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 exoplanet consortium’s sub-programme dedicated to finding planets around M dwarfs. Gl 378 is an M1 star, of solar metallicity, at a distance of 14.96 pc. The single planet detected, Gl 378 b, has a minimum mass of 13.02 MEarth 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, Gl 378 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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M. Hobson, X. Delfosse, N. Astudillo-Defru, I. Boisse, R. F. Diaz, et al.. The SOPHIE search for northern extrasolar planets. Astronomy and Astrophysics - A&A, EDP Sciences, 2019, 625, pp.A18. ⟨10.1051/0004-6361/201834890⟩. ⟨hal-02160575⟩

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