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Atmospheric escape from HD 189733b observed in H I Lyman-α : detailed analysis of HST/STIS September 2011 observations

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Bourrier, V., Lecavelier des Etangs, A., Dupuy, H., Ehrenreich, D., Vidal-Madjar, A., Hébrard, G., Ballester, G. E., Désert, J.-M., Ferlet, R., Sing, D. K. and Wheatley, Peter J. (2013) Atmospheric escape from HD 189733b observed in H I Lyman-α : detailed analysis of HST/STIS September 2011 observations. Astronomy & Astrophysics, Volume 551 . Article number A63. doi:10.1051/0004-6361/201220533

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Official URL: http://dx.doi.org/10.1051/0004-6361/201220533

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Abstract

Observations of transits of the hot giant exoplanet HD 189733b in the unresolved HI Lyman-alpha line show signs of hydrogen escaping the upper atmosphere of the planet. New resolved Lyman-alpha observations obtained with the STIS spectrograph onboard the Hubble Space Telescope in April 2010 and September 2011 confirmed that the planet is evaporating, and furthermore discovered significant temporal variations in the physical conditions of its evaporating atmosphere. Here we present a detailed analysis of the September 2011 observations of HD 189733b, when an atmospheric signature was detected. We present specific methods to find and characterize this absorption signature of escaping hydrogen in the Lyman-alpha line, and to calculate its false-positive probability, found to be 3.6%. Taking advantage of the spectral resolution and high sensitivity of the STIS spectrograph, we also present new results on temporal and spectro-temporal variability of this absorption feature. We also report the observation of HD 189733b in other lines (SiIII at 1206.5A, NV at 1240A). Variations in these lines could be explained either by early occultation by a bow-shock rich in highly ionized species, or by stellar variations.

Item Type: Journal Article
Divisions: Faculty of Science > Physics
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: March 2013
Dates:
DateEvent
March 2013Published
Volume: Volume 551
Number of Pages: 11
Page Range: Article number A63
DOI: 10.1051/0004-6361/201220533
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: NASA , European Commission (EC), STScI , Centre National d'Etudes Spatiales , Fondation Simone et Cino Del Duca
Grant number: NAS 5-26555 (NASA); PIEF-GA-2011-298916 (EC); HST-GO-11673.01-A (STScI); 11673 (Fondation Simone et Cino Del Duca)

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