A. Vidal-Madjar et al 2004 ApJ 604 L69 doi:10.1086/383347
A. Vidal-Madjar1, J.-M. Désert1, A. Lecavelier des Etangs1, G. Hébrard1, G. E. Ballester2, D. Ehrenreich1, R. Ferlet1, J. C. McConnell3, M. Mayor4 and C. D. Parkinson5
Show affiliationsFour 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 consistent with the previous detection completed in 2003 at higher resolution (Vidal-Madjar et al.). The absorption depths in O I and C II show that oxygen and carbon are present in the extended upper atmosphere of HD 209458b (nicknamed "Osiris"). These species must be carried out up to the Roche lobe and beyond, most likely in a state of hydrodynamic escape.
Issue 1 (2004 March 20)
Received 2003 December 23, accepted for publication 2004 February 4
Published 2004 March 1
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