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Comparative Planetary Atmospheres: Models of TrES-1 and HD 209458b

by: J. J. Fortney, M. S. Marley, K. Lodders, D. Saumon, R. Freedman
Astrophysical Journal Letters, Vol. 627 (July 2005), pp. L69-L72, doi:10.1086/431952  Key: citeulike:11962705

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Abstract

We present new self-consistent atmosphere models for the transiting planets TrES-1 and HD 209458b. The planets were recently observed with the Spitzer Space Telescope in bands centered on 4.5 and 8.0 mum, for TrES-1, and 24 mum, for HD 209458b. We find that standard solar-metallicity models fit the observations for HD 209458b. For TrES-1, which has a T<SUB>eff</SUB> ~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 mum and 2 sigma at 8.0 mum. Models with solar abundances that include 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-to-star flux ratios in other Spitzer bandpasses.


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