Description
Light hypothetical particles can be produced in the core of supernovae. Their subsequent decays to neutrinos can produce a flux component with higher energies than the standard flux. We discuss limits on light particles decaying to neutrinos flavor-dependently from supernovae using this flux modification. In particular, we will obtain limits on heavy neutral leptons (HNLs) and ${\rm U(1)}_{L_\mu-L_\tau}$ gauge bosons from SN 1987A and future galactic supernovae.
