Stellar spin evolution for MrefB with respect to the simulation time t in years starting from t₀ = 1 Myr. Panel a shows the disk’s accretion rate Ṁ_disk. Panel b shows the position of the inner disk radius r_trunc with respect to the positions of the co-rotation radius r_cor. The dashed line indicate Panel c show the total torque acting on the star Γ_tot as well as the external torque contributions, which are the same as in Fig. 2. Additionally, the dashed line at Γ = 0.0 indicate the boundary between a spin up and a spin down contribution.