Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-11
Astrophys.J.652:746-757,2006
Astronomy and Astrophysics
Astrophysics
Accepted to the Astrophysical Journal, 8/10/06. Includes 5 color figures
Scientific paper
10.1086/508442
We explore the infrared spectrum of a three-dimensional dynamical model of planet HD209458b as a function of orbital phase. The dynamical model predicts day-side atmospheric pressure-temperature profiles that are much more isothermal at pressures less than 1 bar than one-dimensional radiative-convective models have found. The resulting day-side thermal spectra are very similar to a blackbody, and only weak water absorption features are seen at short wavelengths. The dayside emission is consequently in significantly better agreement with ground-based and space-based secondary eclipse data than any previous models, which predict strong flux peaks and deep absorption features. At other orbital phases, absorption due to carbon monoxide and methane is also predicted. We compute the spectra under two treatments of atmospheric chemistry: one uses the predictions of equilibrium chemistry, and the other uses non-equilibrium chemistry, which ties the timescales of methane and carbon monoxide chemistry to dynamical timescales. As a function of orbital phase, we predict planet-to-star flux ratios for standard infrared bands and all Spitzer Space Telescope bands. In Spitzer bands, we predict 2-fold to 15-fold variation in planetary flux as a function of orbital phase with equilibrium chemistry, and 2-fold to 4-fold variation with non-equilibrium chemistry. Variation is generally more pronounced in bands from 3-10 $\mu$m than at longer wavelengths. The orbital phase of maximum thermal emission in infrared bands is 15--45 orbital degrees before the time of secondary eclipse. Changes in flux as a function of orbital phase for HD209458b should be observable with Spitzer, given the previously acheived observational error bars.
Cooper Curtis S.
Fortney Jonathan J.
Freedman Richard Stuart
Marley Mark S.
Showman Adam P.
No associations
LandOfFree
The Influence of Atmospheric Dynamics on the Infrared Spectra and Light Curves of Hot Jupiters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Influence of Atmospheric Dynamics on the Infrared Spectra and Light Curves of Hot Jupiters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Influence of Atmospheric Dynamics on the Infrared Spectra and Light Curves of Hot Jupiters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-547636