Q′ as a function of eccentricity for stagnant lid convection (sl) and plate tectonic convection (pt) for a planet with the size and density of Corot 7 b and two different asthenosphere thicknesses. The contribution by melt migration is not included in the calculation of Q′. The respective orbital period is quoted in the legend. Nu(Ra) according to Eq. (6) (sl) and Eq. (14) (pt). The model parameters are listed in Tables 1 and 3–5. B = 25.