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Atmospheric composition and structure of HD209458b

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arxiv 0808.3987 v1 pith:JXC4Y3HQ submitted 2008-08-28 astro-ph

J.-M. Désert , A. Vidal-Madjar , A. Lecavelier des Etangs , D. Sing , D. Ehrenreich , G. Hébrard , R. Ferlet This is my paper · ORCID
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keywords atmospherehd209458batmosphericcompositionstructureabsoluteabsorptionsabundance
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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 limb. We present a re-analysis of existing archived 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 with a temperature inversion and explain broad band absorptions with the presence of TiO and VO molecules in the atmosphere of this planet.

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