Neutrino Signal of Electron-Capture Supernovae from Core Collapse to Cooling

TL;DR

This paper presents a detailed simulation of an 8.8 solar mass electron-capture supernova, covering collapse to cooling, revealing neutrino emission characteristics and implications for nucleosynthesis and neutrino oscillations.

Contribution

It provides the first comprehensive simulation from collapse to cooling for this supernova type, including neutrino spectra and flavor oscillation insights.

Findings

Neutrino luminosities reach equipartition among species.

Spectra of electron antineutrinos and muon/tau antineutrinos become very similar.

Short evolution time (~9 s) due to nucleon-nucleon correlations.

Abstract

An 8.8 solar mass electron-capture supernova (SN) was simulated in spherical symmetry consistently from collapse through explosion to nearly complete deleptonization of the forming neutron star. The evolution time of about 9 s is short because of nucleon-nucleon correlations in the neutrino opacities. After a brief phase of accretion-enhanced luminosities (~200 ms), luminosity equipartition among all species becomes almost perfect and the spectra of electron antineutrinos and muon/tau antineutrinos very similar. We discuss consequences for the neutrino-driven wind as a nucleosynthesis site and for flavor oscillations of SN neutrinos.