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An orbital period of 0.94 days for the hot-Jupiter planet WASP-18b

Author

Listed:
  • Coel Hellier

    (Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK)

  • D. R. Anderson

    (Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK)

  • A. Collier Cameron

    (School of Physics and Astronomy, University of St Andrews, North Haugh, Fife, KY16 9SS, UK)

  • M. Gillon

    (Observatoire de Genève, Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
    Institut d'Astrophysique et de Géophysique, Université de Liège, 17 Allée du 6 Août, Batiment B5C, Liège 1, Belgium)

  • L. Hebb

    (School of Physics and Astronomy, University of St Andrews, North Haugh, Fife, KY16 9SS, UK)

  • P. F. L. Maxted

    (Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK)

  • D. Queloz

    (Observatoire de Genève, Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland)

  • B. Smalley

    (Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK)

  • A. H. M. J. Triaud

    (Observatoire de Genève, Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland)

  • R. G. West

    (University of Leicester, Leicester, LE1 7RH, UK)

  • D. M. Wilson

    (Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK)

  • S. J. Bentley

    (Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK)

  • B. Enoch

    (School of Physics and Astronomy, University of St Andrews, North Haugh, Fife, KY16 9SS, UK)

  • K. Horne

    (School of Physics and Astronomy, University of St Andrews, North Haugh, Fife, KY16 9SS, UK)

  • J. Irwin

    (Harvard University, 60 Garden Street, MS 10, Cambridge, Massachusetts 02138, USA)

  • T. A. Lister

    (Las Cumbres Observatory, 6740 Cortona Dr. Suite 102, Santa Barbara, California 93117, USA)

  • M. Mayor

    (Observatoire de Genève, Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland)

  • N. Parley

    (School of Physics and Astronomy, University of St Andrews, North Haugh, Fife, KY16 9SS, UK)

  • F. Pepe

    (Observatoire de Genève, Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland)

  • D. L. Pollacco

    (Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University, University Road, Belfast, BT7 1NN, UK)

  • D. Segransan

    (Observatoire de Genève, Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland)

  • S. Udry

    (Observatoire de Genève, Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland)

  • P. J. Wheatley

    (University of Warwick, Coventry, CV4 7AL, UK)

Abstract

Hot Jupiter WASP-18b: a too-close encounter 'Hot Jupiter' extrasolar planets are thought to have formed at some distance from their host stars and to have migrated inwards at a later date. These planets provide new perspectives on the evolution of planetary systems, and the discovery of WASP-18b, the closest-orbiting and most extreme hot Jupiter yet, provides a glimpse of what may be a planet nearing the end of its life. With a close orbit, high mass (ten times that of Jupiter), and brief (0.94-day) orbital period, WASP-18b has the strongest tidal interaction of any known star–planet system. We appear to be seeing WASP-18b in a rare and short-lived state as it spirals towards its host star, destined to be destroyed within the host star's lifetime. Alternatively, the tidal dissipation this system — and perhaps other hot Jupiters — must be much weaker than that in our Solar System.

Suggested Citation

  • Coel Hellier & D. R. Anderson & A. Collier Cameron & M. Gillon & L. Hebb & P. F. L. Maxted & D. Queloz & B. Smalley & A. H. M. J. Triaud & R. G. West & D. M. Wilson & S. J. Bentley & B. Enoch & K. Hor, 2009. "An orbital period of 0.94 days for the hot-Jupiter planet WASP-18b," Nature, Nature, vol. 460(7259), pages 1098-1100, August.
    • Handle: RePEc:nat:nature:v:460:y:2009:i:7259:d:10.1038_nature08245
    DOI: 10.1038/nature08245
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