Atmospheric composition and structure of HD209458b

Details Atmospheric composition and structure of HD209458b Atmospheric composition and structure of HD209458b

2008-08-28

arxiv.org/abs/0808.3987v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. To appear in the Proceedings of the 253rd IAU Symposium: "Transiting Planets", May 2008, Cambridge, MA

Scientific paper

10.1017/S1743921308027117

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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