Analysis of the SN1987A two-stage explosion hypothesis with account for the MSW neutrino flavour conversion

TL;DR

This paper investigates the two-stage supernova explosion hypothesis for SN1987A, analyzing neutrino data with MSW flavor conversion effects to constrain properties of the initial collapse phase.

Contribution

It introduces a comprehensive analysis of SN1987A neutrino data considering MSW flavor conversion, accounting for unknown neutrino parameters to refine supernova collapse models.

Findings

Constraints on the first stage of supernova collapse based on neutrino data

Dependence of constraints on neutrino mass hierarchy and mixing angle

Refined understanding of supernova neutrino emission properties

Abstract

Detection of 5 events by the Liquid Scintillation Detector (LSD) on February, 23, 1987 was interpreted in the literature as the detection of neutrinos from the first stage of the two-stage supernova collapse. We pose rigid constraints on the properties of the first stage of the collapse, taking into account neutrino flavour conversion due to the MSW-effect and general properties of supernova neutrino emission. The constraints depend on the unknown neutrino mass hierarchy and mixing angle \theta_{13}.