The neutrino signal from SN1987A offers a unique opportunity to study the dynamics of core-collapse supernovae, but its interpretation has been hindered by detector timing uncertainties and ambiguities in the origin of the earliest events.
I will present a new statistical analysis combining neutrino energies, arrival times, and angular distributions within a realistic parametric emission model including an initial accretion phase and subsequent cooling evolution. The analysis confirms the existence of an accretion phase at the 99% confidence level and determines the thermodynamical properties and time-scale of the emission. By introducing a systematic treatment of detector timing offsets, it is possible to reconstruct the SN1987A neutrino timeline with sub-second precision, overcoming historical uncertainties of Kamiokanke-II and Baksan’s clocks. This allows a quantitative test of the nature of the first Kamiokande-II event, showing a statistical preference for an accretion-phase electron antineutrino origin over the neutronization burst case. The resulting framework provides the most precise reconstruction of the SN1987A neutrino emission timeline to date and offers a methodology directly applicable to future Galactic supernova neutrino observations.
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Vigilante di Risi
International Centre of Theoretical Physics Asia-Pacific (ICTP-AP)
University of Chinese Academy of Science (UCAS)
Beijing, China
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