The HARPS search for southern extra-solar planets XLII. A system of Earth-mass planets around the nearby M dwarf YZ Ceti

  title={The HARPS search for southern extra-solar planets XLII. A system of Earth-mass planets around the nearby M dwarf YZ Ceti},
  author={Nicola Astudillo-Defru and Rodrigo F. D'iaz and Xavier Bonfils and J. M. Almenara and Jean-Baptiste Delisle and François Bouchy and Xavier Delfosse and Thierry Forveille and Cristophe Lovis and Michel Mayor and Felipe Murgas and Francesco A. Pepe and Nuno C. Santos and Damien S'egransan and St{\'e}phane Udry and Anael Wunsche},
  journal={arXiv: Earth and Planetary Astrophysics},
Exoplanet surveys have shown that systems with multiple low-mass planets on compact orbits are common. Except for few cases, however, the masses of these planets are generally unknown. At the very end of the main sequence, host stars have the lowest mass and hence offer the largest reflect motion for a given planet. In that context, we monitored the low-mass (0.13Msun) M dwarf YZ Cet (GJ 54.1, HIP 5643) intensively and obtained both radial velocities and stellar-activity indicators derived from… Expand

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