Fraction of unbound envelope mass as a function of time for the adiabatic simulation (red), the ‘radiative’ simulation (blue), and the ‘radiative + heating’ simulation (green). Solid lines assume material is unbound when the total mechanical energy is positive (e_k+e_p>0), while dashed lines are less restrictive, considering material to be unbound when the sum of the mechanical and internal energy is positive (e_k+e_p+e_gas+e_rad>0).