The closest extrasolar planet: A giant planet around the M4 dwarf Gl 876
  High precision radial velocity observations of the nearby M4 dwarf Gl 876 with the Observatoire de Haute Provence 1.93 m telescope and the new 1.20 m swiss telescope at la Silla indicate the presence of a jovian mass companion to this star. The orbital fit to the data gives a period of 60.8 days, a velocity amplitude of 246 m/s and an eccentricity of 0.34. Assuming that Gl 876 has a mass of 0.3 solar masses, the mass function implies a mass for the companion of 2/sin(i) Jupiter masses. 
Xavier Delfosse, Thierry Forveille, Michel Mayor, Christian Perrier,   Dominique Naef, Didier Queloz