An extrasolar planetary system with three Neptune-mass planets

Christophe Lovis (), Michel Mayor (), Francesco Pepe, Yann Alibert, Willy Benz, François Bouchy, Alexandre C. M. Correia, Jacques Laskar, Christoph Mordasini, Didier Queloz, Nuno C. Santos, Stéphane Udry, Jean-Loup Bertaux and Jean-Pierre Sivan
Additional contact information
Christophe Lovis: Observatoire de Genève
Michel Mayor: Observatoire de Genève
Francesco Pepe: Observatoire de Genève
Yann Alibert: Physikalisches Institut der Universität Bern
Willy Benz: Physikalisches Institut der Universität Bern
François Bouchy: Observatoire de Haute-Provence, 04870 St Michel l'Observatoire
Alexandre C. M. Correia: Campus Universitário de Santiago
Jacques Laskar: Astronomie et Systèmes Dynamiques, IMCCE-CNRS UMR 8028
Christoph Mordasini: Physikalisches Institut der Universität Bern
Didier Queloz: Observatoire de Genève
Nuno C. Santos: Observatoire de Genève
Stéphane Udry: Observatoire de Genève
Jean-Loup Bertaux: Service d'Aéronomie du CNRS, BP 3, 91371 Verrières-le-Buisson
Jean-Pierre Sivan: Traverse du Siphon

Nature, 2006, vol. 441, issue 7091, 305-309

Abstract: Abstract Over the past two years, the search for low-mass extrasolar planets has led to the detection of seven so-called ‘hot Neptunes’ or ‘super-Earths’ around Sun-like stars. These planets have masses 5–20 times larger than the Earth and are mainly found on close-in orbits with periods of 2–15 days. Here we report a system of three Neptune-mass planets with periods of 8.67, 31.6 and 197 days, orbiting the nearby star HD 69830. This star was already known to show an infrared excess possibly caused by an asteroid belt within 1 au (the Sun–Earth distance). Simulations show that the system is in a dynamically stable configuration. Theoretical calculations favour a mainly rocky composition for both inner planets, while the outer planet probably has a significant gaseous envelope surrounding its rocky/icy core; the outer planet orbits within the habitable zone of this star.

Date: 2006
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DOI: 10.1038/nature04828

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