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

  title={The HARPS search for southern extra-solar planets - VI. A Neptune-mass planet around the nearby M dwarf Gl 581},
  author={Xavier Bonfils and Thierry Forveille and Xavier Delfosse and St{\'e}phane Udry and Michel Mayor and Christian Perrier and François Bouchy and Francesco A. Pepe and Didier Queloz and J L Bertaux},
  journal={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… Expand

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