Comparative planetary atmospheres: Models of TrES-1 and HD 209458B

J. J. Fortney, M. S. Marley, K. Lodders, D. Saumon, R. Freedman

Research output: Contribution to journalArticlepeer-review

170 Scopus citations


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 μm, for TrES-1, and 24 μm, for HD 209458b. We find that standard solar-metallicity models fit the observations for HD 209458b. For TrES-1, which has a Teff ∼ 300 K cooler, we find that models with a metallicity 3-5 times enhanced over solar abundances can match the 1 σ error bar at 4.5 μm and 2 σ at 8.0 μm. Models with solar abundances that include energy deposition into the stratosphere give fluxes that fall within the 2 σ 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.

Original languageEnglish (US)
Pages (from-to)L69-L72
JournalAstrophysical Journal
Issue number1 II
StatePublished - Jul 1 2005
Externally publishedYes


  • Binaries: eclipsing
  • Planetary systems
  • Radiative transfer
  • Stars: individual (TrES-1, HD 209458)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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