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A super-Earth orbiting the nearby M dwarf GJ 536

A. Suárez Mascareño, J. I. González Hernández, R. Rebolo López, N. Astudillo-Defru, X. Bonfils, F. Bouchy, X. Delfosse, T. Forveille, C. Lovis, M. Mayor, F. Murgas Alcaino, F. Pepe, N. C. Santos, S. Udry, A. Wünsche, J. Veljanoski

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 M sin i of 5.36 +/- 0.69 M-circle plus; 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 IIH&K and H-alpha 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.

Keywords
Planetary Systems — Techniques: radial velocity — Stars: activity — Stars: chromospheres — Stars: rotation — Stars: magnetic cycle — starspots — Stars: individual (GJ 536)

Astronomy and Astrophysics
Volume 597, Article Number A108
2017 January

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Fundação para a Ciência e a Tecnologia
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