Schematic representation of the parametrization used in our models for the planet temperature–pressure profile. The atmosphere is composed of two isothermal layers (at temperatures T_base and T_up) separated bya layer with constant lapse rate d log(p)∕dt. While T_base is fixed to 1450 K and the base pressure is fixed to 3 bars, the other quantities are varied in a small grid, as explained in Sect. 4.2.