Induction Heating in Super-Earths: A Thermochemical Perspective

Electromagnetic induction heating has recently been proposed as an important internal heat source in the mantles
of rocky exoplanets. However, its dependence on planetary interior properties remains poorly constrained. Here,
we construct electrical conductivity profiles for super-Earth mantles considering different temperatures and
compositions, and evaluate induction heating in super-Earth mantles in both solid and partially molten states. We
find that high mantle temperature, iron content, and melt fraction all suppress the overall induction heating
efficiency due to increased mantle conductivity and magnetic shielding. In GJ 486b, induction heating likely
exceeds both radiogenic heating and tidal heating, driving persistent surface volcanism and early volatile
depletion, whereas HD 3167b and GJ 357b experience insignificant induction heating due to weak stellar
magnetic fields. Our findings highlight induction heating as a critical factor in the thermal and atmospheric
evolution of close-in super-Earths around magnetically active stars.