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An extrasolar planetary system with three Neptune-mass planets

Author

Listed:
  • 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
    Institut d'Astrophysique de Paris)

  • 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
    Centro de Astronomia e Astrofísica da Universidade de Lisboa, Observatório Astronómico de Lisboa
    Centro de Geofísica de Évora, Colégio Luis Verney)

  • 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)

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.

Suggested Citation

  • 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 & Stéph, 2006. "An extrasolar planetary system with three Neptune-mass planets," Nature, Nature, vol. 441(7091), pages 305-309, May.
    • Handle: RePEc:nat:nature:v:441:y:2006:i:7091:d:10.1038_nature04828
    DOI: 10.1038/nature04828
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