2013MNRAS.435.2268F

We present z'-band secondary eclipse photometry of the highly irradiated hot Jupiter WASP-12b using ULTRACAM on the 4.2m William Herschel Telescope. We measure a decrease in flux of δ = 0.130±0.013 percent during the passage of the planet behind the star, which is significantly deeper than the previous measurement at this wavelength (0.082±0.015 percent). Our secondary eclipse is best fitted with a mid-eclipse phase, φ, that is compatible with a circular orbit φ = 0.501±0.002, in agreement with previous results. In combination with existing data, our eclipse depth measurement allows us to constrain the characteristics of the planet's atmosphere, which is consistent with a carbon-rich model, with no evidence for a strong thermal inversion. If the difference in eclipse depth reported here compared to that of López-Morales et al. is of physical origin, as opposed to due to systematics, it may be caused by temporal variability in the flux, due to atmospheric dynamics.