Normalized torques acting on a Jupiter mass planet as a function of the local disk mass, with α = 0.003 and q = 0.001. Shown is the evolution of the torques during the migration process, each track starts at the rightmost point with the highest value of . The black dots mark the point when the planet has reached a_P = 0.7. During the inward migration the local disk mass , where Σ_P is the surface density in the undisturbed surface density profile at planet position a_p, decreases. The models differ in their initial disk density Σ₀ varied by the disk accretion rate ṁ, where Σ_S corresponds to ṁ = 10^-7. The torques are averaged over 50 orbits.