Left: the effect of the planet-star distance (a magnitude of irradiation) on the T − P profile of the atmosphere. Red lines represent the day side, blue lines represent the night side. Circles mark the top of the convection zone. D-stands for day, N-stands for night, numbers give the planet-star distance in AU and the core entropy, respectively. Notice that entropy on both day and night sides increases with increasing irradiation (shorter distance). Right: the effect of the planet-star distance or irradiation on the day-night side cooling of the planet. The cooling is expressed as the intrinsic effective temperature in K as a function of the core entropy for several surface gravities. The day-side is solid, and night-side is dashed. The models are calculated for two planet-star distances 0.045 (green) and 0.0225 AU (red). The cooling from the day side decreases with the stellar irradiation (shorter distance). The cooling from the night side behaves in a similar way. Consequently, the total heat loss is lower at a higher irradiation.