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We propose a new constraint on light (sub-GeV) particles beyond the StandardModel that can be produced inside the proto-neutron star core resulting fromthe core-collapse supernova explosion. It is derived by demanding that theenergy carried by exotic particles being transferred to the progenitor stellarenvelopes must not exceed the explosion energy of $\lesssim 2\cdot 10^{51}$ ergof observed supernovae. We show specifically that for the case of a dark photonwhich kinetically mixes with the SM photon and decays predominantly to an$e^\pm$ pair, a smaller mixing parameter of one order of magnitude below thewell-established supernova cooling bound can be excluded. Furthermore, ourbound fills the gap between the cooling bound and the region constrained by(non)observation of gamma rays produced from supernovae for dark photonslighter than ~ 20 MeV. Our result also rules out the possibility of aidingsuccessful supernova explosions by transferring energy from the supernova coreto the shock with exotic particles.

New constraint from supernova explosions on light particles beyond the Standard Model