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={S. Udry and X. Bonfils and X. Delfosse and T. Forveille and M. Mayor and C. Perrier and F. Bouchy and C. Lovis and F. Pepe and D. Queloz and Joseph L. Geneve and Universit'e de Geneve and Switzerland. and C. D. F. N. D. U. D. Lisboa and Portugal and Laboratoire d'astrophysique and Observatoire de Grenoble and U. J. Fourier and France. and I. 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… Expand
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