(Top panel) Photon luminosity with growing heat injection, in the case of Fe (solid lines) or H (dashed lines) envelopes. (Bottom panel) Corresponding neutrino luminosity, with its dominant channels: a continuous line indicates the total L_ν, dashed lines the contribution from e⁺e⁻ pair annihilation, dotted lines the one from plasmon decay, and the dash-dotted the weak-synchrotron emission. The baseline of neutrino luminosity, not plotted separately, is in this case due to the breaking of ²P₂ Cooper pairs in the core. For clarity of presentation, we rescaled each family of curves by a factor indicated in the figure, and only the curves calculated with the H envelope are displayed (the ones corresponding to the Fe envelope are almost indistinguishable from them).