The HARPS search for southern extra-solar planets. XI. Super-Earths (5 and 8 M{⊕}) in a 3-planet system

@article{Udry2007TheHS,
  title={The HARPS search for southern extra-solar planets. XI. Super-Earths (5 and 8 M\{⊕\}) in a 3-planet system},
  author={St{\'e}phane Udry and Xavier Bonfils and Xavier Delfosse and Thierry Forveille and Michel Mayor and Christian Perrier and François Bouchy and Christophe Lovis and Francesco A. Pepe and Didier Queloz and Joseph L. Geneve and Universit'e de Geneve and Switzerland. and Centro de Astronomia e Astrofisica de Universidade de Lisboa and Portugal and Laboratoire d'astrophysique and Observatoire de Grenoble and Universit'e Joseph Fourier and France. and Institut d'Astrophysique de Paris and Service d'A'eronomie du Cnrsipsl and Verrieres-le-Buisson},
  journal={Astronomy and Astrophysics},
  year={2007},
  volume={469}
}
This Letter reports on the detection of two super-Earth planets in the Gl 581 system, which is already known to harbour a hot Neptune. One of the planets has a mass of 5 M⊕ and resides at the “warm” edge of the habitable zone of the star. It is thus the known exoplanet that most resembles our own Earth. The other planet has a 7.7 M⊕ mass and orbits at 0.25 AU from the star, close to the “cold” edge of the habitable zone. These two new light planets around an M3 dwarf further confirm the… 

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