A long-period Jupiter-mass planet orbiting the nearby M dwarf GJ 849

R. Paul Butler, John Asher Johnson, Geoffrey W. Marcy, Jason T. Wright, Steven S. Vogt, Debra A. Fischer

Research output: Contribution to journalArticlepeer-review

83 Scopus citations


We report precise Doppler measurements of GJ 849 (M3.5 V) that reveal the presence of a planet with a minimum mass of 0.82MJup in a 5.16 yr orbit. At a = 2.35 AU, GJ 849b is the first Doppler-detected planet discovered around an M dwarf orbiting beyond 0.21 AU, and is only the second Jupiter-mass planet discovered around a star less massive than 0.5 M. This detection brings to four the number of M stars known to harbor planets. Based on the results of our survey of 1300 FGKM main-sequence stars we find that giant planets within 2.5 AU are ∼3 times more common around GK stars than around M stars. Due to GJ 849's proximity of 8.8 pc, the planet's angular separation is 0.27″, making this system a prime target for high-resolution imaging using adaptive optics and future space-borne missions such as the Space Interferometry Mission PlanetQuest. We also find evidence of a linear trend in the velocity time series, which may be indicative of an additional planetary companion.

Original languageEnglish (US)
Pages (from-to)1685-1689
Number of pages5
JournalPublications of the Astronomical Society of the Pacific
Issue number850
StatePublished - Dec 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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