University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Monday, November 7th 2016
12:15 pm:
Speaker: Cheng-Hsien Li (University of Minnesota)
Subject: Neutrinos from SN1987A in Light of Recent Simulations

It has been nearly three decades since the first and the only detection of neutrinos from stellar collapse. Earlier analyses on the SN1987A neutrino events observed in the Kamiokande-II detector and the Irvine-Michigan-Brookhaven detector were based on parametric neutrino emission models due to the lack of sophisticated simulation techniques. We re-examine this historical event with the state-of-the-art 1D hydrodynamic simulation results from Mirizzi et al.(2016), which includes a mixing-length treatment of proto-neutron star convection. We use an exhaustive enumeration method to perform a simple goodness-of-fit test of the simulated neutrino emission profiles against the SN1987A data. Despite the limited statistics of SN1987A data, we point out the incompatibility between the last three Kamiokande-II events, if they are associated with the core collapse of SN1987A, and the rapid cooling of the proto-neutron star prescribed by the convection treatment. The implications will be briefly discussed.

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