The Data Analysis of the HD 209458b Transit in Lyα

Details The Data Analysis of the HD 209458b Transit in Lyα The Data Analysis of the HD 209458b Transit in Lyα

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..321..205d&link_type=abstract

Extrasolar Planets: Today and Tomorrow, ASP Conference Proceedings, Vol. 321, held 30 June - 4 July 2003, Institut D'Astrophysiq

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

Using STIS - HST observations, we have detected an extended upper atmosphere in the extrasolar planet HD 209458b. The spectra show an absorption of 15±4% of the stellar Lyα 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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