Detection of oxygen and carbon in the hydrodynamically escaping atmosphere of the extrasolar planet HD 209458B

A. Vidal-Madjar, J. M. Désert, A. Lecavelier Des Etangs, G. Hébrard, G. E. Ballester, D. Ehrenreich, R. Ferlet, J. C. McConnell, M. Mayor, C. D. Parkinson

Research output: Contribution to journalArticlepeer-review

441 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)L69-L72
JournalAstrophysical Journal
Volume604
Issue number1 II
DOIs
StatePublished - Mar 20 2004
Externally publishedYes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint

Dive into the research topics of 'Detection of oxygen and carbon in the hydrodynamically escaping atmosphere of the extrasolar planet HD 209458B'. Together they form a unique fingerprint.

Cite this