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The hydrogen exosphere of exoplanet HD 209458b detected with HST/ACS

Published online by Cambridge University Press:  01 May 2008

D. Ehrenreich ,
A. Lecavelier des Etangs ,
G. Hébrard ,
J.-M. Désert ,
A. Vidal-Madjar ,
J. C. McConnell ,
C. D. Parkinson ,
G. E. Ballester  and
R. Ferlet
D. Ehrenreich
Affiliation:
Laboratoire d'astrophysique de Grenoble, Université Joseph Fourier and CNRS (UMR 5571) BP 53, 38041 Grenoble cedex 9, France email: [email protected]
A. Lecavelier des Etangs
Affiliation:
Institut d'astrophysique de Paris, Université Pierre-et-Marie Curie and CNRS (UMR 7095) 98 bis, boulevard Arago 75014 Paris, France
G. Hébrard
Affiliation:
Institut d'astrophysique de Paris, Université Pierre-et-Marie Curie and CNRS (UMR 7095) 98 bis, boulevard Arago 75014 Paris, France
J.-M. Désert
Affiliation:
Institut d'astrophysique de Paris, Université Pierre-et-Marie Curie and CNRS (UMR 7095) 98 bis, boulevard Arago 75014 Paris, France
A. Vidal-Madjar
Affiliation:
Institut d'astrophysique de Paris, Université Pierre-et-Marie Curie and CNRS (UMR 7095) 98 bis, boulevard Arago 75014 Paris, France
J. C. McConnell
Affiliation:
Department of Earth and Space Science and Engineering, York University4700 Keele street, Toronto, Ontario M3J1P3, Canada
C. D. Parkinson
Affiliation:
Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan2455 Hayward street, Ann Arbor, Michigan 48109, USA
G. E. Ballester
Affiliation:
Lunar and Planetary Laboratory, University of Arizona1040 East 4th street, Tucson, Arizona 85721-0077, USA
R. Ferlet
Affiliation:
Institut d'astrophysique de Paris, Université Pierre-et-Marie Curie and CNRS (UMR 7095) 98 bis, boulevard Arago 75014 Paris, France
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Abstract

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Exospheric atomic hydrogen escaping from the planet HD 209458b provides the largest observational signature ever detected for an extrasolar planet atmosphere. We present observations of this transiting planet's extended exosphere with the Advanced Camera for Surveys on board the Hubble Space Telescope. From the two transit light curves obtained at Lyman α, we find an in-transit absorption of (8.0±5.7)%, in good agreement with previous studies. These new constraints on the size of the exosphere strengthens the evaporation scenario. Full details are provided in Ehrenreich et al. (2008).

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S253: Transiting Planets , May 2008 , pp. 528 - 531
Copyright
Copyright © International Astronomical Union 2009

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