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arxiv: 0704.3841 · v1 · submitted 2007-04-29 · 🌌 astro-ph

The HARPS search for southern extra-solar planets XI. Super-Earths (5 & 8 M_Earth) in a 3-planet system

S. Udry (1) , X. Bonfils (2) , X. Delfosse (3) , T. Forveille (3) , M. Mayor (1) , C. Perrier (3) , F. Bouchy (4) , C. Lovis (1)
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F. Pepe (1) D. Queloz (1) J.-L. Bertaux (5) ((1) Observatoire de Geneve Universit\'e de Geneve Switzerland (2) Centro de Astronomia e Astrofisica da Universidade de Lisboa Portugal (3) Laboratoire d'Astrophysique Observatoire de Grenoble Universite J. Fourier France (4) Institut d'Astrophysique de Paris (5) Service d'A\'eronomie du CNRS/IPSL Verri\`eres-le-Buisson France)
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classification 🌌 astro-ph
keywords planetsaroundearthdwarfsedgehabitableknownlow-mass
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This Letter reports on the detection of two super-Earth planets in the Gl581 system, already known to harbour a hot Neptune. One of the planets has a mass of 5 M_Earth and resides at the ``warm'' edge of the habitable zone of the star. It is thus the known exoplanet which most resembles our own Earth. The other planet has a 7.7 M_Earth 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 formerly tentative statistical trend for i) many more very low-mass planets being found around M dwarfs than around solar-type stars and ii) low-mass planets outnumbering Jovian planets around M dwarfs.

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