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Supernova neutrinos in a strangeon star model

Mao Yuan, Ji-Guang Lu, Zhi-Liang Yang, Xiao-Yu Lai, Ren-Xin Xu

Abstract


The neutrino burst detected during supernova SN 1987A 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 for “strange nucleon”). A nascent strangeon star’s initial internal energy is calculated, with the inclusion of pion excitation (energy around 1053 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 tens of seconds after core collapse, and the thermal evolution of a strangeon star is then modeled. It is found that the neutrino burst observed from SN 1987A can be reproduced in such a cooling model.


Keywords


stars: neutron — supernovae: individual (SN 1987A) — neutrinos

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DOI: http://dx.doi.org/10.1088/1674%E2%80%934527%2F17%2F9%2F92

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Print ISSN: 1674-4527

Online ISSN: 2397-6209