The action of neutrinos in supernovae is poorly understood. When the core of a massive star at the end of its life collapses on itself under the effect of gravity, the electrons in the atoms combine with the protons in their nuclei, producing protons along with neutrinos. The neutrinos produced in abundance then escape from the neutron star being formed at a speed even faster than light. So much so that 99% of the energy emitted by a supernova is in the form of neutrinos! The explosion characteristic of supernovae that follows this episode is “driven” by neutrinos.
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Source: Phys.org