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We present a new method to retrieve molecular abundances and temperatureprofiles from exoplanet atmosphere photometry and spectroscopy. We run millionsof 1D atmosphere models in order to cover the large range of allowed parameterspace, and present error contours in the atmospheric properties, given thedata. In order to run such a large number of models, we have developed aparametric pressure-temperature (P-T) profile coupled with line-by-lineradiative transfer, hydrostatic equilibrium, and energy balance, along withprescriptions for non-equilibrium molecular composition and energyredistribution. We apply our temperature and abundance retrieval method to theatmospheres of two transiting exoplanets, HD 189733b and HD 209458b, which havethe best available Spitzer and HST observations. For HD 189733b, we findefficient day-night redistribution of energy in the atmosphere, and molecularabundance constraints confirming the presence of H2O, CO, CH4, and CO2. For HD209458b, we confirm and constrain the day-side thermal inversion in an average1D temperature profile. We also report independent detections of H$_2$O, CO,CH$_4$ and CO$_2$ on the dayside of HD 209458b, based on six-channel Spitzerphotometry. We report constraints for HD 189733b due to individual data setsseparately; a few key observations are variable in different data sets atsimilar wavelengths. Moreover, a noticeably strong carbon dioxide absorption inone data set is significantly weaker in another. We must, therefore,acknowledge the strong possibility that the atmosphere is variable, both in itsenergy redistribution state and in the chemical abundances.

A Temperature and Abundance Retrieval Method for Exoplanet Atmospheres