Speaker
Description
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% con-
fidence level and determines the thermodynamical properties and time-scale of
the emission.
By introducing a systematic treatment of detector timing offsets, we recon-
struct 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 sta-
tistical 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.