The HARPS search for southern extra-solar planets - XIX. Characterization and dynamics of the GJ 876 planetary system

  title={The HARPS search for southern extra-solar planets - XIX. Characterization and dynamics of the GJ 876 planetary system},
  author={Alexandre C. M. Correia and Jocelyn Couetdic and Jacques Laskar and Xavier Bonfils and Michel Mayor and J L Bertaux and François Bouchy and Xavier Delfosse and Thierry Forveille and Christophe Lovis and Francesco A. Pepe and Christian Perrier and Didier Queloz and St{\'e}phane Udry},
  journal={Astronomy and Astrophysics},
Precise radial-velocity measurements for data acquired with the HARPS spectrograph infer that three planets orbit the M4 dwarf star GJ876. In particular, we confirm the existence of planet d, which orbits every 1.93785 days. We find that its orbit may have significant eccentricity (e = 0.14), and deduce a more accurate estimate of its minimum mass of 6.3 M⊕. Dynamical modeling of the HARPS measurements combined with literature velocities from the Keck Observatory strongly constrain the orbital… Expand
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