Neutrino signals from neutron star implosions to black holes

We calculate the neutrino luminosity when dark matter is captured by a neutron star that eventually implodes to form a low -mass black hole. A central disk forms out of the ejected material with a finite radial extension, density, temperature, and lepton fraction, producing fainter neutrino luminosities and colder associated spectra than expected in regular core -collapse supernova and black hole-neutron star mergers. The emitted gravitational wave signal from the implosion should be detectable with ultrahigh -frequency resonant cavities in the range similar to 0.1-1 GHz.