Disk surface temperatures during outburst (heavy lines) and quiescence (light lines) in the planet‐forming region of the solar nebula for models with time‐averaged mass flux of 10⁻⁵ M_⊙ yr⁻¹ (upper panel) and 10⁻⁶ M_⊙ yr⁻¹ (lower panel). The dotted region represents the range of midplane temperatures suggested by the α‐law model with α varying from 10⁻⁴ (upper edge) to 10⁻² (lower edge). Midplane temperatures exceed surface temperatures in these high optical depth models such that material at the midplane is likely to be unaffected by the outburst cycle. Horizontal dotted lines indicate the destruction temperatures of various species: H₂O ice (160 K), volatile organics (425 K), troilite (670 K), and olivine (1270 K). During outburst, vaporization fronts are moved radially out along the surface of the disk.