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A terrestrial planet candidate in a temperate orbit around Proxima Centauri

AuthorsAnglada-Escude, Guillem; Amado, Pedro J. ; Modroño Berdiñas, Zaira ; López González, Maria J. ; Morales, Nicolás ; Ortiz, José Luis ; Rodríguez Martínez, Eloy ; Rodríguez-López, Cristina ; Zechmeister, Mathias
Issue Date24-Aug-2016
PublisherNature Publishing Group
CitationNature 536(7617): 437–440 (2016)
AbstractAt a distance of 1.295 parsecs(1), the red dwarf Proxima Centauri (a Centauri C, GL 551, HIP 70890 or simply Proxima) is the Sun's closest stellar neighbour and one of the best-studied low-mass stars. It has an effective temperature of only around 3,050 kelvin, a luminosity of 0.15 per cent of that of the Sun, a measured radius of 14 per cent of the radius of the Sun2 and a mass of about 12 per cent of the mass of the Sun. Although Proxima is considered a moderately active star, its rotation period is about 83 days (ref. 3) and its quiescent activity levels and X-ray luminosity(4) are comparable to those of the Sun. Here we report observations that reveal the presence of a small planet with a minimum mass of about 1.3 Earth masses orbiting Proxima with a period of approximately 11.2 days at a semi-major-axis distance of around 0.05 astronomical units. Its equilibrium temperature is within the range where water could be liquid on its surface(5).
DescriptionAnglada-Escude, Guillem et. al.
Publisher version (URL)http://dx.doi.org/10.1038/nature19106
Appears in Collections:(IAA) Artículos
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