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Evidence was previously reported for an 8 MeV neutrino line associated withSN 1987A based on an analysis of 997 events recorded in the Kamiokande-IIdetector on the day of the supernova. That claimed line, however, occurred atthe peak of the background spectrum, and both had a similar shape, making theclaim tenuous at best. Here the claim is buttressed by providing five reasonsto expect such an 8 MeV neutrino line. A final section of the paper concernsthe ongoing KATRIN experiment to find the neutrino mass, which might provideadditional support for the line, should it validate a controversial 3 + 3 modelof the neutrino masses, including a tachyonic (m2 < 0) mass.

5 Reasons to expect an 8 MeV line in the SN 1987A neutrino spectrum