# Supernova Neutrino in a Strangeon Star Model

## TL;DR

This paper proposes a strangeon star model to explain the supernova neutrino burst observed in SN1987A, incorporating pion excitation and phase transition effects to match observed neutrino signals.

## Contribution

It introduces a novel strangeon star model with detailed thermal evolution and phase transition analysis to explain supernova neutrino observations.

## Key findings

- Neutrino burst from SN1987A can be reproduced by the strangeon star cooling model.
- Initial internal energy includes pion excitation energy around 10^53 erg.
- A phase transition at 1-2 MeV temperature occurs a few tens of seconds after core-collapse.

## Abstract

The neutrino burst detected during supernova SN1987A is explained in a strangeon star model, in which it is proposed that a pulsar-like compact object is composed of strangeons (strangeon: an abbreviation of "strange nucleon"). A nascent strangeon star's initial internal energy is calculated, with the inclusion of pion excitation (energy around 10^53 erg, comparable to the gravitational binding energy of a collapsed core). A liquid-solid phase transition at temperature ~ 1-2 MeV may occur only a few ten-seconds after core-collapse, and the thermal evolution of strangeon star is then modeled. It is found that the neutrino burst observed from SN 1987A could be re-produced in such a cooling model.