University of Hertfordshire

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  • 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
  • .
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Original languageEnglish
Pages (from-to)1477-1481
Number of pages5
JournalScience
Volume368
Issue6498
DOIs
Publication statusPublished - 26 Jun 2020

Abstract

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.

Notes

© 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: https://doi.org/10.1126/science.aaz0795.

ID: 22253798