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NUV radii of the extrasolar planet HD 209458b
J. M. Desert, A. Vidal-Madjar, A. Lecavelier des Etangs +2
Extrasolar planetary transits are powerful tools to probe their atmosphere and to extract key physical properties of planets, like their mean densities, chemical compositions, or a…
The data analysis of HD209458 Ly-alpha transit occultation
J. -M. Désert, A. Vidal-Madjar, A. Lecavelier des Étangs +4
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 Ly-alph…
"Osiris"(HD209458b), an evaporating planet
Alfred Vidal-Madjar, Alain Lecavelier des Etangs
Three transits of the planet orbiting the solar type star HD209458 were observed in the far UV at the wavelength of the HI Ly-alpha line. The planet size at this wavelength is equa…