The HARPS search for southern extra-solar planets. XVII. Super-Earth and Neptune-mass planets in m

  title={The HARPS search for southern extra-solar planets. XVII. Super-Earth and Neptune-mass planets in m},
  author={François Bouchy and Michel Mayor and Christophe Lovis and St{\'e}phane Udry and W. Benz and J L Bertaux and Xavier Delfosse and Christoph Mordasini and Francesco A. Pepe and Didier Queloz and Damien S{\'e}gransan},
  journal={Astronomy and Astrophysics},
We report on the detection of two new multiple planet systems orbiting solar-like stars HD 47 186 and HD 181 433. The first system contains a hot Neptune of 22.78 M⊕ with a 4.08-day period and a Saturn of 0.35 MJUP with a 3.7-year period. The second system contains a Super-Earth of 7.5 M⊕ with a 9.4-day period, a 0.64 MJUP with a 2.6-year period, and a third companion of 0.54 MJUP with a period of about 6 years. These detections increase to 20 the number of close-in low-mass exoplanets (below 0… 

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