Journal
NATURE
Volume 536, Issue 7617, Pages 437-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nature19106
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Funding
- Leverhulme Trust/UK [RPG-2014-281]
- MINECO/Spain [ESP2014-54362-P, AYA-2014-54348-C3-1-R, AYA-2014-56637-C2-1-P]
- J. A./Spain [2012-FQM1776]
- CATA-Basal/Chile PB06 Conicyt
- Fondecyt/Chile [1161218]
- STFC/UK [ST/M001008/1, ST/L000776/1]
- ERC/EU [279347]
- DFG/Germany Research [RE 1664/9-2, RE 1664/12-1]
- DFG/Germany Colloborative Research Center 963
- DFG/Germany Research Training Group 1351
- NSF/USA [AST-1313075]
- ESO Telescopes at the La Silla Paranal Observatory [096.C-0082, 191.C-0505]
- STFC [ST/M001202/1, ST/L000776/1, ST/M001008/1, ST/F007280/1, ST/G002622/1, ST/L001403/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L001403/1, ST/L000776/1, ST/M001008/1, ST/F007280/1, ST/G002622/1] Funding Source: researchfish
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1313075] Funding Source: National Science Foundation
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At 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).
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