| Issue |
A&A
Volume 605, September 2017
|
|
|---|---|---|
| Article Number | A92 | |
| Number of page(s) | 15 | |
| Section | Planets and planetary systems | |
| DOI | https://doi.org/10.1051/0004-6361/201730957 | |
| Published online | 18 September 2017 | |
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⋆,⋆⋆
1 Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain
e-mail: jonay@iac.es
2 Observatoire Astronomique de l’Université de Genève, 1290 Versoix, Switzerland
e-mail: Alejandro.SuarezMascareno@unige.ch
3 Universidad de La Laguna, Dpto. Astrofísica, 38206 La Laguna, Tenerife, Spain
4 Consejo Superior de Investigaciones Científicas, 28006 Madrid, Spain
5 INAF–Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
6 Institut de Ciènces de l’Espai (CSIC-IEEC), Campus UAB, Carrer de Can Magrans s/n, 08193 Cerdanyola del Vallés, Spain
7 INAF–Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy
8 INAF–Osservatorio Astrofisico di Torino, via Osservatorio 20, 10025 Pino Torinese, Italy
9 INAF–Osservatorio Astronomico di Capodimonte, via Moiariello, 16, 80131 Napoli, Italy
10 INAF–Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy
11 INAF–Osservatorio Astronomico di Trieste, via Tiepolo 11, 34143 Trieste, Italy
12 INAF–Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), Italy
13 Fundación Galileo Galilei, INAF, Rambla José Ana Fernandez Pérez 7, 38712 Breña Baja, TF, Spain
Received: 7 April 2017
Accepted: 16 May 2017
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 Msini of 2.82 ± 0.51 M⊕ 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 Hα 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.
Key words: planetary systems / techniques: radial velocities / stars: activity / stars: chromospheres / stars: individual: GJ 625 / planets and satellites: detection
Based on observations made with the Italian Telescopio Nazionale Galileo (TNG), operated on the island of La Palma by the INAF – Fundación Galileo Galilei at the Roche de Los Muchachos Observatory of the Instituto de Astrofísica de Canarias (IAC); photometric observations made with the robotic telescope APT2 (within the EXORAP programme) located at Serra La Nave on Mt. Etna; and lucky imaging observations made with the Telescopio Carlos Sánchez operated on the island of Tenerife by the Instituto de Astrofísica de Canarias in the Spanish Observatorio del Teide.
Tables A.1–A.5 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/605/A92
© ESO, 2017
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