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The dynamics of a low-mass protoplanet accreting solids is influenced by the heating torque, which was found to suppress inward migration in protoplanetary disks with constant opacities.\n  Aims. We investigate the differences of the heating torque between disks with constant and temperature-dependent opacities.\n  Methods. Interactions of a super-Earth-sized protoplanet with the gas disk are explored using 3D radiation hydrodynamic simulations.\n  Results. 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