The HARPS search for southern extra-solar planets - VI. A Neptune-mass planet around the nearby M dwarf Gl 581

@article{Bonfils2005TheHS,
  title={The HARPS search for southern extra-solar planets - VI. A Neptune-mass planet around the nearby M dwarf Gl 581},
  author={X. Bonfils and T. Forveille and X. Delfosse and S. Udry and M. Mayor and C. Perrier and F. Bouchy and F. Pepe and D. Queloz and J. Bertaux},
  journal={Astronomy and Astrophysics},
  year={2005},
  volume={443}
}
  • X. Bonfils, T. Forveille, +7 authors J. Bertaux
  • Published 2005
  • Physics
  • Astronomy and Astrophysics
  • We report the discovery of a Neptune-mass planet around Gl 581 (M3V, M = 0.31 ), based on precise Doppler measurements with the HARPS spectrograph at La Silla Observatory. The radial velocities reveal a circular orbit of period P = 5.366 days and semi-amplitude K1 = 13.2 m s-1. The resulting minimum mass of the planet ( ) is only 0.052 = 0.97 = 16.6 making Gl 581b one of the lightest extra-solar planet known to date. The Gl 581 planetary system is only the third centered on an M dwarf, joining… CONTINUE READING
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