The HARPS search for southern extra-solar planets XLI. A dozen planets around the M dwarfs GJ 3138, GJ 3323, GJ 273, GJ 628, and GJ 3293

@article{AstudilloDefru2017TheHS,
  title={The HARPS search for southern extra-solar planets XLI. A dozen planets around the M dwarfs GJ 3138, GJ 3323, GJ 273, GJ 628, and GJ 3293},
  author={Nicola Astudillo-Defru and Thierry Forveille and Xavier Bonfils and Damien S'egransan and François Bouchy and Xavier Delfosse and Christophe Lovis and Michel Mayor and Felipe Murgas and Francesco Pepe and Nuno C. Santos and St{\'e}phane Udry and Anael Wunsche},
  journal={arXiv: Earth and Planetary Astrophysics},
  year={2017}
}
Context. Low mass stars are currently the best targets for searches for rocky planets in the habitable zone of their host star. Over the last 13 years, precise radial velocities measured with the HARPS spectrograph have identified over a dozen super-Earths and Earth-mass planets (msin i<10Mearth ) around M dwarfs, with a well understood selection function. This well defined sample informs on their frequency of occurrence and on the distribution of their orbital parameters, and therefore already… 
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TLDR
A sub-Earth–sized planet with a density almost equivalent to pure iron is identified on a 7.7-hour orbit around a nearby red dwarf star, suggesting that it is the iron core of a planet that has lost its outer mantle.
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