Detection of Oxygen and Carbon in the Hydrodynamically Escaping Atmosphere of the Extrasolar Planet HD 209458b

@article{VidalMadjar2004DetectionOO,
  title={Detection of Oxygen and Carbon in the Hydrodynamically Escaping Atmosphere of the Extrasolar Planet HD 209458b},
  author={Alfred Vidal-Madjar and J.-M. D'esert and Alain Lecavelier des Etangs and Guillaume H'ebrard and Gilda E. Ballester and David Ehrenreich and Roger Ferlet and John C. McConnell and Michel Mayor and Christopher D. Parkinson},
  journal={The Astrophysical Journal Letters},
  year={2004},
  volume={604},
  pages={L69 - L72}
}
Four transits of the planet orbiting the star HD 209458 were observed with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope. The wavelength domain (1180-1710 Å) includes H I as well as C I, C II, C IV, N V, O I, S I, Si II, Si III, and Si IV lines. During the transits, absorptions are detected in H I, O I, and C II (5% ± 2%, 13% ± 4.5%, and 7.5% ± 3.5%, respectively). No absorptions are detected for other lines. The 5% mean absorption over the whole H I Lyα line is… 

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