A super-Earth orbiting the nearby M dwarf GJ 536

A. Suárez Mascareño , J. I. González Hernández , R. Rebolo , N. Astudillo-Defru , X. Bonfils (1) , F. Bouchy , X. Delfosse (1) , T. Forveille (1) , C. Lovis , M. Mayor , F. Murgas (1) , F. Pepe , N. C. Santos , S. Udry , A. Wünsche , S. Velasco

1 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble

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 H_α 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.

The data used in this paper (Table A.1) are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/597/A108

Keywords: techniques: radial velocities; stars: rotation; planets and satellites: terrestrial planets; stars: individual: GJ 536; stars: activity; planets and satellites: general; Astrophysics - Earth and Planetary Astrophysics

Domains: Sciences of the Universe [physics]; Astrophysics [astro-ph]

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 and Astrophysics - A&A, 2017, 597, ⟨10.1051/0004-6361/201629291⟩. ⟨insu-03692547⟩