The combined night and day side cooling as a function of the surface gravity and core entropy. It is expressed as the intrinsic effective temperature in K. Left: the effect of the irradiation. The models are calculated for two different values of the planet-star distance: 0.045, 0.0225 AU. The total core heat loss decreases with increasing irradiation (smaller distance). Right: the effect of the atmospheric metallicity. the models are calculated for two different values of the metallicity: solar and 3  ×  solar. Total heat loss decreases with increasing the metallicity.