University of Hertfordshire

From the same journal

By the same authors

A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887

Research output: Contribution to journalArticlepeer-review


  • 2006.16372v1

    Accepted author manuscript, 2.97 MB, PDF document

  • S. V. Jeffers
  • S. Dreizler
  • J. R. Barnes
  • C. A. Haswell
  • R. P. Nelson
  • E. Rodríguez
  • M. J. Lopez-Gonzalez
  • N. Morales
  • R. Luque
  • M. Zechmeister
  • S. S. Vogt
  • J. S. Jenkins
  • E. Palle
  • Z. M. Berdinas
  • G. A. L. Coleman
  • M. R. Diaz
  • I. Ribas
  • R. P. Butler
  • C. G. Tinney
  • J. Bailey
  • B. D. Carter
  • S. ~O'Toole
  • R. A. Wittenmyer
  • J. D. Crane
  • F. Feng
  • S. A. Shectman
  • J. Teske
  • A. Reiners
  • P. J. Amado
  • G. Anglada-Escude
  • .
View graph of relations
Original languageEnglish
Pages (from-to)1477-1481
Number of pages5
Publication statusPublished - 26 Jun 2020


The closet exoplanets to the Sun provide opportunities for detailed characterization of planets outside the Solar System. We report the discovery, using radial velocity measurements, of a compact multiplanet system of super-Earth exoplanets orbiting the nearby red dwarf star GJ 887. The two planets have orbital periods of 9.3 and 21.8 days. Assuming an Earth-like albedo, the equilibrium temperature of the 21.8-day planet is ~350 kelvin. The planets are interior to, but close to the inner edge of, the liquid-water habitable zone. We also detect an unconfirmed signal with a period of ~50 days, which could correspond to a third super-Earth in a more temperate orbit. Our observations show that GJ 887 has photometric variability below 500 parts per million, which is unusually quiet for a red dwarf.


© 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. This is the author’s version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science on 26 Jun 2020: Vol. 368, Issue 6498, pp. 1477-1481. DOI:


ID: 22253798