Paper: astro-ph/0505359
Date: Tue, 17 May 2005 20:13:27 GMT (112kb)
Title: Comparative Planetary Atmospheres: Models of TrES-1 and HD209458b
Authors: J.J. Fortney, M.S. Marley, K. Lodders, D. Saumon, R. Freedman
Comments: Accepted to the Astrophysical Journal Letters, May 17, 2005
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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.