The energy deposition and redistribution in hot Jupiter atmospheres is not well understood currently , but is a major factor for their evolution and survival .
We present a time dependent radiative transfer model for the atmosphere of WASP-18b which is a massive ( 10 M _ { Jup } ) hot Jupiter ( T _ { eq } ~ { } \sim~ { } 2400 Â K ) exoplanet orbiting an F6V star with an orbital period of only 0.94 days .

Our model includes a simplified parametrisation of the day-to-night energy redistribution by a modulation of the stellar heating mimicking a solid body rotation of the atmosphere .
We present the cases with either no rotation at all with respect to the synchronously rotating reference frame or a fast differential rotation .

The results of the model are compared to previous observations of secondary eclipses of Nymeyer et al .
( 2011 ) with the Spitzer Space Telescope .
Their observed planetary flux suggests that the efficiency of heat distribution from the day-side to the night-side of the planet is extremely inefficient .
Our results are consistent with the fact that such large day-side fluxes can be obtained only if there is no rotation of the atmosphere .

Additionally , we infer light curves of the planet for a full orbit in the two Warm Spitzer bandpassses for the two cases of rotation and discuss the observational differences .