Identification of Absorption Features in an Extrasolar Planet Atmosphere

Details Identification of Absorption Features in an Extrasolar Planet Atmosphere Identification of Absorption Features in an Extrasolar Planet Atmosphere

2007-04-09

arxiv.org/abs/0704.1114v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJL., in emulate ApJ format

Scientific paper

10.1086/518736

Water absorption is identified in the atmosphere of HD209458b by comparing models for the planet's transmitted spectrum to recent, multi-wavelength, eclipse-depth measurements (from 0.3 to 1 microns) published by Knutson et al. (2007). A cloud-free model which includes solar abundances, rainout of condensates, and photoionization of sodium and potassium is in good agreement with the entire set of eclipse-depth measurements from the ultraviolet to near-infrared. Constraints are placed on condensate removal by gravitational settling, the bulk metallicity, and the redistribution of absorbed stellar flux. Comparisons are also made to the Charbonneau et al. (2002) sodium measurements.

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