HADES RV Programme with HARPS-N at TNG V. A super-Earth on the inner edge of the habitable zone of the nearby M dwarf GJ 625

作者：Suarez Mascareno A; Gonzalez Hernandez J I; Rebolo R; Velasco S; Toledo Padron B; Affer L; Perger M; Micela G; Ribas I; Maldonado J; Leto G; Sanchez R Zanmar; Scandariato G; Damasso M; Sozzetti A; Esposito M; Covino E; Maggio A; Lanza A F; Desidera S; Rosich A; Bignamini A; Claudi R; Benatti S; Borsa F; Pedani M; Molinari E; Morales J C; Herrero E; Lafarga M

来源：Astronomy & Astrophysics, 2017, 605: A92.

DOI：10.1051/0004-6361/201730957

• planetary systems
• techniques: radial velocities
• stars: activity
• stars: chromospheres
• stars: individual: GJ 625
• planets and satellites: detection

We report the discovery of a super-Earth orbiting at the inner edge of the habitable zone of the star GJ 625 based on the analysis of the radial-velocity (RV) time series from the HARPS-N spectrograph, consisting of 151 HARPS-N measurements taken over 3.5 yr. GJ 625 b is a planet with a minimum mass Msin i of 2.82 +/- 0.51 M circle plus with an orbital period of 14.628 +/- 0.013 days at a distance of 0.078 AU from its parent star. The host star is the quiet M2 V star GJ 625, located at 6.5 pc from the Sun. We find the presence of a second radial-velocity signal in the range 74-85 days that we relate to stellar rotation after analysing the time series of Ca II H&K and H alpha spectroscopic indicators, the variations of the FWHM of the CCF, and the APT2 photometric light curves. We find no evidence linking the short-period radial-velocity signal to any activity proxy.

• 出版日期2017-9