Initial midplane snowline location resulting from the two-stream radiation transport model (Equation (29)) as function of Rosseland mean opacity κ_R and stellar luminosity L_⋆ . Here the optical opacity is fixed to κ_vi = 10 cm²g⁻¹. The permitted parameter space is divided into three regimes (white dashed lines, for illustration purpose only): “passive disk” when L_⋆ is high, “active disk” when κ_R is high and “vertically-isothermal” disk when κ_R is small. The dotted lines are temperature contours of the midplane at 2.1 au, ranging from 100 K to 200 K in 10 K increments. The black solid line represents the parameter combinations that lead to r_snow,mid = 2.1 au and the black dots denote the parameter combinations used in this work, as summarized in Table 1. Hydrodynamic and thermodynamic effects will move the snowline location in the simulation.