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A ground-based near-infrared emission spectrum of the exoplanet HD 189733b

Author

Listed:
  • Mark R. Swain

    (Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA)

  • Pieter Deroo

    (Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA)

  • Caitlin A. Griffith

    (University of Arizona, Lunar and Planetary Laboratory, Space Science Building Room 525, 1629 East University Boulevard, Tucson, Arizona 85721, USA)

  • Giovanna Tinetti

    (University College London, Gower Street, WC1E 6BT, London, UK)

  • Azam Thatte

    (Woodruff School of Mechanical Engineering, MRDC Building, Room 4111, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, USA)

  • Gautam Vasisht

    (Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA)

  • Pin Chen

    (Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA)

  • Jeroen Bouwman

    (Max-Planck Institute for Astronomy, Koenigstuhl 17, D-69117, Heidelberg, Germany)

  • Ian J. Crossfield

    (475 Portola Plaza, Los Angeles, California 90034, USA)

  • Daniel Angerhausen

    (German SOFIA Institute, Institute for Space Systems, Pfaffenwaldring 3170569, Stuttgart, Germany)

  • Cristina Afonso

    (Max-Planck Institute for Astronomy, Koenigstuhl 17, D-69117, Heidelberg, Germany)

  • Thomas Henning

    (Max-Planck Institute for Astronomy, Koenigstuhl 17, D-69117, Heidelberg, Germany)

Abstract

Exoplanet atmospheres Space-based infrared spectroscopy has successfully identified various molecules — H2O, CH4, CO2 and CO — in the atmospheres of 'hot Jupiter' extrasolar planets. Swain et al. now report ground-based observations of the dayside emission spectrum of the hot Jupiter HD 189733b at near-infrared wavelengths not available to space-based telescopes. They find a bright emission feature at ∼3.25 μm which is unexpected and difficult to explain using current models that assume local thermodynamic equilibrium conditions. Fluorescence emission from methane, similar to that seen in the atmospheres of Solar System planets, seems a likely explanation. This work suggests that atmospheric chemistry on exoplanets is more complex than was thought, and opens the field of exoplanet molecular spectroscopy to ground-based telescopes.

Suggested Citation

  • Mark R. Swain & Pieter Deroo & Caitlin A. Griffith & Giovanna Tinetti & Azam Thatte & Gautam Vasisht & Pin Chen & Jeroen Bouwman & Ian J. Crossfield & Daniel Angerhausen & Cristina Afonso & Thomas Hen, 2010. "A ground-based near-infrared emission spectrum of the exoplanet HD 189733b," Nature, Nature, vol. 463(7281), pages 637-639, February.
    • Handle: RePEc:nat:nature:v:463:y:2010:i:7281:d:10.1038_nature08775
    DOI: 10.1038/nature08775
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