Comparative Planetary Atmospheres: Models of TrES-1 and HD209458b

Abstract

We present new self-consistent atmosphere models for transiting planets TrES-1 and HD209458b. The planets were recently observed with the Spitzer Space Telescope in bands centered on 4.5 and 8.0 $\mu$m, for TrES-1, and 24 $\mu$m, for HD209458b. We find that standard solar metallicity models fit the observations for HD209458b. For TrES-1, which has an T_eff ~300 K cooler, we find that models with a metallicity 3-5 times enhanced over solar abundances can match the 1$\sigma$ error bar at 4.5 $\mu$m and 2$\sigma$ at 8.0$\mu$m. Models with solar abundances that included energy deposition into the stratosphere give fluxes that fall within the 2$\sigma$ error bars in both bands. The best-fit models for both planets assume that reradiation of absorbed stellar flux occurs over the entire planet. For all models of both planets we predict planet/star flux ratios in other Spitzer bandpasses.

Accepted to the Astrophysical Journal Letters, May 17, 2005

References in corpus (9)

• Detection of Thermal Emission from an Extrasolar Planet
• Infrared radiation from an extrasolar planet
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• A Time-Dependent Radiative Model of HD209458b
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• On the Insignificance of Photochemical Hydrocarbon Aerosols in the Atmospheres of Close-in Extrasolar Giant Planets
• High-Resolution Spectroscopy of the Transiting Planet Host Star TrES-1

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