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A super-Earth orbiting the nearby M dwarf GJ 536

Abstract : We report the discovery of a super-Earth orbiting the star GJ 536 based on the analysis of the radial-velocity time series from the HARPS and HARPS-N spectrographs. GJ 536 b is a planet with a minimum mass Msini of 5.36 ± 0.69 M; it has an orbital period of 8.7076 ± 0.0025 d at a distance of 0.066610(13) AU, and an orbit that is consistent with circular. The host star is the moderately quiet M1 V star GJ 536, located at 10 pc from the Sun. We find the presence of a second signal at 43 d that we relate to stellar rotation after analysing the time series of Ca II H&K and Hα spectroscopic indicators and photometric data from the ASAS archive. We find no evidence linking the short period signal to any activity proxy. We also tentatively derived a stellar magnetic cycle of less than 3 yr.

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Submitted on : Friday, June 10, 2022 - 7:20:25 AM
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A. Suárez Mascareño, J. I. González Hernández, R. Rebolo, N. Astudillo-Defru, X. Bonfils, et al.. A super-Earth orbiting the nearby M dwarf GJ 536. Astronomy & Astrophysics, 2017, 597, ⟨10.1051/0004-6361/201629291⟩. ⟨insu-03692547⟩



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