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Atmospheric composition and structure of HD209458b

Published online by Cambridge University Press:  01 May 2008

J.-M. Désert ,
A. Vidal-Madjar ,
A. Lecavelier des Etangs ,
D. Sing ,
D. Ehrenreich ,
G. Hébrard  and
R. Ferlet
J.-M. Désert
Affiliation:
Institut d'Astrophysique de Paris, CNRS (UMR 7095)Université Pierre & Marie Curie; 98 bis, boulevard Arago 75014 Paris, France email: desert@iap.fr
A. Vidal-Madjar
Affiliation:
Institut d'Astrophysique de Paris, CNRS (UMR 7095)Université Pierre & Marie Curie; 98 bis, boulevard Arago 75014 Paris, France email: desert@iap.fr
A. Lecavelier des Etangs
Affiliation:
Institut d'Astrophysique de Paris, CNRS (UMR 7095)Université Pierre & Marie Curie; 98 bis, boulevard Arago 75014 Paris, France email: desert@iap.fr
D. Sing
Affiliation:
Institut d'Astrophysique de Paris, CNRS (UMR 7095)Université Pierre & Marie Curie; 98 bis, boulevard Arago 75014 Paris, France email: desert@iap.fr
D. Ehrenreich
Affiliation:
Laboratoire d'Astrophysique, Observatoire de Grenoble, UJF, CNRS; BP 53, F-38041 GRENOBLE Cedex 9 (France)
G. Hébrard
Affiliation:
Institut d'Astrophysique de Paris, CNRS (UMR 7095)Université Pierre & Marie Curie; 98 bis, boulevard Arago 75014 Paris, France email: desert@iap.fr
R. Ferlet
Affiliation:
Institut d'Astrophysique de Paris, CNRS (UMR 7095)Université Pierre & Marie Curie; 98 bis, boulevard Arago 75014 Paris, France email: desert@iap.fr
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Abstract

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Transiting planets like HD209458b offer a unique opportunity to scrutinize their atmospheric composition and structure. Transit spectroscopy probes the transition region between the day and night sides, called the limb. We present a re-analysis of existing HST/STIS transmission spectra of HD209458b's atmosphere. From these observations we identify H2 Rayleigh scattering, derive the absolute Sodium abundance and quantify its depletion in the upper atmosphere, extract a stratospheric T-P profile and find a temperature inversion and explain broad band absorptions with the presence of TiO and VO molecules.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S253: Transiting Planets , May 2008 , pp. 524 - 527
Copyright
Copyright © International Astronomical Union 2009

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