Ministerio de Economía y Competitividad Gobierno de Canarias Universidad de La Laguna CSIC Centro de Excelencia Severo Ochoa

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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

Author/s: A. Suárez Mascareño, J. I. González-Hernández, R. Rebolo et al.

Reference: 2017, A&A (en prensa) | Link

Mean surface temperature of GJ 625 b as a function of albedo and the fraction of radiation absorbed by the atmosphere (top panel) and change of the habitable zone as a function of cloud coverage of the planet (bottom panel). The Earth symbol shows where it would be with an Earth-like albedo and green- house effect (top panel), and with an Earth-like cloud coverage (bottom panel).
Mean surface temperature of GJ 625 b as a function of albedo and the fraction of radiation absorbed by the atmosphere (top panel) and change of the habitable zone as a function of cloud coverage of the planet (bottom panel). The Earth symbol shows where it would be with an Earth-like albedo and green- house effect (top panel), and with an Earth-like cloud coverage (bottom panel).
We report the discovery of a new super-Earth orbiting the nearby cool dwarf star GJ 625 in the inner edge of the habitable zone. This result has been achieved thanks to the analysis of the radial velocity (RV) time series from the HARPS-N spectrograph, in particular, 151 HARPS-N measurements taken over 3.5 yr. The planet GJ 625 b has a mass of roughly 2.8 Earth masses and an orbital period of ~14.6 days at a distance of ~0.08 AU of its host star. The star GJ 625 is a low-activity M dwarf star located at 6.5 pc (~21 light years) from the Sun, with a stellar rotation period in the range 75-85 days.

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