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), 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)

TL;DR
This paper reports the discovery of a Warm Neptune orbiting the M-dwarf Gl378, providing insights into the characteristics and evolution of close-in Neptunes around low-mass stars.
Contribution
It presents the detection of a Warm Neptune around an M-dwarf using radial velocity data, highlighting its position near the Hot Neptune desert and implications for planetary migration.
Findings
Gl378 b has a minimum mass of 13.02 Earth masses.
Orbital period of 3.82 days places it near the Hot Neptune desert.
Eccentricity of 0.1 suggests possible high-eccentricity migration.
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 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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Taxonomy
TopicsStellar, planetary, and galactic studies · Astro and Planetary Science · Astrophysics and Star Formation Studies
