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Paper: The Data Analysis of the HD209458b Transit in Lyman α
Volume: 321, Extrasolar Planets: Today and Tomorrow
Page: 205
Authors: Desert, J.-M.; Vidal-Madjar, A.; Lecavelier des Etangs, A.; Hebrard, G.; Ballester, G.; Ferlet, R.; Mayor, M.
Abstract: Using STIS - HST observations, we have detected an extended upper atmosphere in the extrasolar planet HD209458b. The spectra show an absorption of 15±4% of the stellar Lyman α emission line during the planetary transit in front of the star. This is interpreted as the signature of HI evaporation taking place around the planet within an extended upper atmosphere (Vidal-Madjar et al. 2003). We present the data analysis of these observations. A particular attention is paid to the background correction and the airglow subtraction.
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