Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-29
Astron.Astrophys.469:L43-L47,2007
Astronomy and Astrophysics
Astrophysics
Revised version resubmitted to A&A Letters, 5 pages, 4 figures
Scientific paper
10.1051/0004-6361:20077612
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.
Bertaux Jean Loup
Bonfils Xavier
Bouchy Florent
Delfosse Xavier
Forveille Thierry
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