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Alfred Vidal-Madjar
Researcher at Centre national de la recherche scientifique
Publications - 213
Citations - 9515
Alfred Vidal-Madjar is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Exoplanet & Planet. The author has an hindex of 53, co-authored 213 publications receiving 9046 citations. Previous affiliations of Alfred Vidal-Madjar include Russian Academy of Sciences & Institut d'Astrophysique de Paris.
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Journal ArticleDOI
A continuum from clear to cloudy hot-Jupiter exoplanets without primordial water depletion
David K. Sing,Jonathan J. Fortney,Nikolay Nikolov,Hannah R. Wakeford,Tiffany Kataria,Thomas M. Evans,Suzanne Aigrain,Gilda E. Ballester,Adam Burrows,Drake Deming,Jean-Michel Desert,Neale P. Gibson,Gregory W. Henry,Catherine M. Huitson,Heather Knutson,Alain Lecavelier des Etangs,Frederic Pont,Adam P. Showman,Alfred Vidal-Madjar,Michael H. Williamson,Paul Wilson +20 more
TL;DR: The difference between the planetary radius measured at optical and infrared wavelengths is an effective metric for distinguishing different atmosphere types, so that strong water absorption lines are seen in clear-atmosphere planets and the weakest features are associated with clouds and hazes.
Journal ArticleDOI
Detection of oxygen and carbon in the hydrodynamically escaping atmosphere of the extrasolar planet HD209458b
Alfred Vidal-Madjar,Jean-Michel Desert,A. Lecavelier des Etangs,G. Hebrard,G. E. Ballester,David Ehrenreich,Roger Ferlet,J. C. McConnell,M. Mayor,Christopher D. Parkinson +9 more
TL;DR: In this article, four transits of the planet orbiting the star HD209458 were observed with the STIS spectrograph on board HST. During the transits, absorptions are detected in HI, OI and CII (5+/-2, 13+/-4.5% and 7.5 +/-3.5%, respectively).
Journal ArticleDOI
A Far Ultraviolet Spectroscopic Explorer Survey of Interstellar Molecular Hydrogen in Translucent Clouds
Brian L. Rachford,Theodore P. Snow,Jason Tumlinson,J. Michael Shull,J. Michael Shull,William P. Blair,Roger Ferlet,Scott D. Friedman,Cecile Gry,Edward B. Jenkins,Donald C. Morton,Blair D. Savage,Paule Sonnentrucker,Alfred Vidal-Madjar,Daniel E. Welty,Donald G. York +15 more
TL;DR: In this article, the authors report the first ensemble results from the Far Ultraviolet Spectroscopic Explorer survey of molecular hydrogen in lines of sight with AV e1 mag, and find strong correlations between H2 and molecules such as CH, CN, and CO, in general agreement with predictions of chemical models.
Journal ArticleDOI
A FUSE Survey of Interstellar Molecular Hydrogen in Translucent Clouds
Brian L. Rachford,Theodore P. Snow,Jason Tumlinson,J. Michael Shull,William P. Blair,Roger Ferlet,Scott D. Friedman,Cecile Gry,Edward B. Jenkins,Donald C. Morton,Blair D. Savage,Paule Sonnentrucker,Alfred Vidal-Madjar,Daniel E. Welty,Donald G. York +14 more
TL;DR: In this article, the first ensemble results from the FUSE survey of molecular hydrogen in lines of sight with A_V $\gtrsim$ 1 mag. were reported, which contained 99% of the total hydrogen column densities.
Journal ArticleDOI
Evaporation of the planet HD189733b observed in HI Lyman-alpha
A. Lecavelier des Etangs,David Ehrenreich,Alfred Vidal-Madjar,Gilda E. Ballester,Jean-Michel Desert,Roger Ferlet,G. Hebrard,David K. Sing,K.-O. Tchakoumegni,Stéphane Udry +9 more
TL;DR: In this paper, a transit of the extrasolar planet HD189733b in HI Lyman-alpha and in a few other lines in the ultraviolet with HST/ACS was detected.