Atmospheric composition and structure of HD209458b

J.-M. Désert, A. Vidal-Madjar, A. Lecavelier des Etangs, D. Sing, D. Ehrenreich, G. Hébrard, R. Ferlet
2008 Proceedings of the International Astronomical Union  
AbstractTransiting 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
more » ... rofile and find a temperature inversion and explain broad band absorptions with the presence of TiO and VO molecules.
doi:10.1017/s1743921308027117 fatcat:44hufp7a3vddvfrmpd677xlduq