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We revisit constraints on dark photons with masses below ~ 100 MeV from theobservations of Supernova 1987A. If dark photons are produced in sufficientquantity, they reduce the amount of energy emitted in the form of neutrinos, inconflict with observations. For the first time, we include the effects offinite temperature and density on the kinetic-mixing parameter, epsilon, inthis environment. This causes the constraints on epsilon to weaken with thedark-photon mass below ~ 15 MeV. For large-enough values of epsilon, it is wellknown that dark photons can be reabsorbed within the supernova. Since the ratesof reabsorption processes decrease as the dark-photon energy increases, wepoint out that dark photons with energies above the Wien peak can escapewithout scattering, contributing more to energy loss than is possible assuminga blackbody spectrum. Furthermore, we estimate the systematic uncertainties onthe cooling bounds by deriving constraints assuming one analytic and fourdifferent simulated temperature and density profiles of the proto-neutron star.Finally, we estimate also the systematic uncertainty on the bound by varyingthe distance across which dark photons must propagate from their point ofproduction to be able to affect the star. This work clarifies the bounds fromSN1987A on the dark-photon parameter space.

Revisiting Supernova 1987A Constraints on Dark Photons