  We analyzed two eclipse observations of the low-density transiting, likely
grazing, exoplanet WASP-34b with the Spitzer Space Telescope's InfraRed Array
Camera (IRAC) using two techniques to correct for intrapixel sensitivity
variation: Pixel-Level Decorrelation (PLD) and BiLinearly Interpolated Subpixel
Sensitivity (BLISS). When jointly fitting both light curves, timing results are
consistent within 0.7$\sigma$ between the two models and eclipse depths are
consistent within 1.1$\sigma$, where the difference is due to photometry
methods, not the models themselves. By combining published radial velocity
data, amateur and professional transit observations, and our eclipse timings,
we improved upon measurements of orbital parameters and found an eccentricity
consistent with zero (0.0). Atmospheric retrieval, using our Bayesian
Atmospheric Radiative Transfer code (BART), shows that the planetary spectrum
most resembles a blackbody, with no constraint on molecular abundances or
vertical temperature variation. WASP-34b is redder than other warm Jupiters
with a similar temperature, hinting at unique chemistry, although further
observations are necessary to confirm this.
