Energy release rates inside Proxima Cen b for different model setups compared to our reference case (1.8 M_⊕, fast rotator, 20 wt% iron and inclination between the star’s magnetic field axis and the rotational axis of 60°). Top left: two different stellar rotation histories. Arrows indicate corotation time, when the stellar rotation period equals the planetary orbital period of 11.2 days. Top right: different observational inclinations of the Proxima Cen system, leading to different actual planet masses (M = M_min/sin(i)). Bottom left: influence of planet iron content. Bottom right: influence of inclination between the star’s magnetic field axis and rotational axis.