Donor heating of a disk sometime after the disk formation at t = t_frm = 42.966 Myr (blue curve; see Table 2) and at t = t_AGB = 48.111 Myr (red curve). The NSD profiles of surface density (top panel) and midplane temperature (bottom panel) are presented. The solid lines show the results with donor heating taken into account. The dashed lines show the results without accounting for the donor heating, i.e., for $T_{\text{I},\text{D}}^4$ set to zero in Eq. (22).