University of Hertfordshire

From the same journal

From the same journal

By the same authors

A terrestrial planet candidate in a temperate orbit around Proxima Centauri

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  • eso1629a

    Accepted author manuscript, 1.43 MB, PDF document


  • Guillem Anglada-Escude
  • Pedro J. Amado
  • John Barnes
  • Zaira M. Berdinas
  • Paul Butler
  • Gavin A. L. Coleman
  • Ignacio de la Cueva
  • Stefan Dreizler
  • Michael Endl
  • Benjamin Giesers
  • Sandra V. Jeffers
  • James S. Jenkins
  • Marcin Kiraga
  • Martin Kurster
  • Maria J. Lopez-Gonzalez
  • Christopher J. Marvin
  • Nicolas Morales
  • Julien Morin
  • Richard P. Nelson
  • Jose L. Ortiz
  • Aviv Ofir
  • Sijme-Jan Paardekooper
  • Ansgar Reiners
  • Eloy Rodriguez
  • Cristina Rodriguez-Lopez
  • Luis F. Sarmiento
  • John P. Strachan
  • Yiannis Tsapras
  • Mikko Tuomi
  • Mathias Zechmeister
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Original languageEnglish
Pages (from-to)437-440
Early online date24 Aug 2016
Publication statusPublished - 25 Aug 2016


At a distance of 1.295 parsecs, the red dwarf Proxima Centauri (α 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 Sun 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 and its quiescent activity levels and X-ray luminosity4 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.

ID: 10455422