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This dissertation as a whole aims to provide means to better understandhot-Jupiter planets through observing, performing thermochemical calculations,and modeling their atmospheres. We used Spitzer multi-wavelengthsecondary-eclipse observations and targets with high signal-to-noise ratios, astheir deep eclipses allow us to detect signatures of spectral features andassess planetary atmospheric structure and composition with greater certainty.Chapter 1 gives a short introduction. Chapter 2 presents the Spitzersecondary-eclipse analysis and atmospheric characterization of WASP-14b.WASP-14b is a highly irradiated, transiting hot Jupiter. By applying a Bayesianapproach in the atmospheric analysis, we found an absence of thermal inversioncontrary to theoretical predictions. Chapter 3 describes the infraredobservations of WASP-43b Spitzer secondary eclipses, data analysis, andatmospheric characterization. WASP-43b is one of the closest-orbiting hotJupiters, orbiting one of the coolest stars with a hot Jupiter. The atmosphericanalysis ruled out a strong thermal inversion in its dayside atmosphere.Chapter 4 presents an open-source Thermochemical Equilibrium Abundances (TEA)code and its application to several hot Jupiters. TEA calculates the abundancesof gaseous species using the Gibbs free-energy minimization method within aniterative Lagrangian optimization scheme. The code is written in Python andavailable to the community via http://github.com/dzesmin/TEA. Chapter 5presents my contributions to an open-source Bayesian Atmospheric RadiativeTransfer (BART) code, and its application to WASP-43b. BART characterizesplanetary atmospheres based on the observed spectroscopic information. Itinitializes a planetary atmospheric model, performs radiative-transfercalculations to produce models of planetary spectra, and using a statisticalmodule compares models with observations.

Observations, Thermochemical Calculations, and Modeling of Exoplanetary Atmospheres