TY - JOUR
T1 - Detection of oxygen and carbon in the hydrodynamically escaping atmosphere of the extrasolar planet HD 209458B
AU - Vidal-Madjar, A.
AU - Désert, J. M.
AU - Lecavelier Des Etangs, A.
AU - Hébrard, G.
AU - Ballester, G. E.
AU - Ehrenreich, D.
AU - Ferlet, R.
AU - McConnell, J. C.
AU - Mayor, M.
AU - Parkinson, C. D.
N1 - Funding Information:
Based on observations obtained with the NASA/ESA Hubble Space Telescope operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. We thank S. Beckwith for allocating us Director’s Discretionary Time. C. D. P. acknowledges support by NASA through the Astrobiology Institute under Cooperative Agreement CAN-00-OSS-01 and issued through the Office of Space Science. We thank the Egyptian god Osiris for suggesting his name for the planet (Vidal-Madjar & Lecavelier des Etangs 2003).
PY - 2004/3/20
Y1 - 2004/3/20
N2 - 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 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.
AB - 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 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.
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U2 - 10.1086/383347
DO - 10.1086/383347
M3 - Article
AN - SCOPUS:2442534132
SN - 0004-637X
VL - 604
SP - L69-L72
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1 II
ER -