Dust temperature radial profile at different times for an arbitrary model with the gas number density profile described by Eq. (2) and R_c = 10^4.5 AU and n_H(r₀) = 10⁷ cm⁻³. With time, T_d increases, driven by the protostar luminosity. The flat inner part represents the sublimation of the dust grains. The minimum temperature is set to 15 K to ensure continuity with the collapse phase.