The HARPS search for southern extra-solar planets - V. A 14 Earth-masses planet orbiting HD 4308

  title={The HARPS search for southern extra-solar planets - V. A 14 Earth-masses planet orbiting HD 4308},
  author={St{\'e}phane Udry and Michel Mayor and W. Benz and J L Bertaux and François Bouchy and Christophe Lovis and Christoph Mordasini and Francesco A. Pepe and Didier Queloz and J. P. Sivan},
  journal={Astronomy and Astrophysics},
We present here the discovery and characterisation of a very light planet around HD4308. The planet orbits its star in 15.56 days. The circular radial-velocity variation presents a tiny semi-amplitude of 4.1 m/s that corresponds to a planetary minimum mass m2sin(i)=14.1 Earth masses. The planet was unveiled by high-precision radial-velocity measurements obtained with the HARPS spectrograph on the ESO 3.6-m telescope. The radial-velocity residuals around the Keplerian solution are 1.3 m/s… 
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