Multimessenger Search of Core-Collapse Supernovae

In this research topic, we focus on multimessenger analysis to hunt for core-collapse supernovae (CCSNe) via low-energy neutrino (LEN, ~MeV energy) and gravitational wave (GW) channel. The goal is to expand the CCSN search horizon with current and future detectors. In other words, we are finding a method to increase the significance of the astrophysical signals and to suppress as much as possible the noise. This can be seen as to improve the detection efficiency. Here, we are also involved in the supernova neutrino community, namely SuperNova Early Warning System (SNEWS2.0).

This effort is very delicate since CCSN rate is very low (~3 events per century in Milky Way), the detector search horizon only covers nearby galaxies (up to Small Magellanic Cloud, ~66 kpc, for LEN detectors and <10 kpc for GW detectors), as well as the real signals is difficult to distinguish from the noise. To get a higher CCSN rate, we should focus ourselves on expanding the search horizon to M31 and further (>1 Mpc). This is basically beyond the current detector capability for conservative CCSN models. Therefore, we are working on an analysis method to improve our capability to detect CCSNe for the current (and future) detectors.

We have summarised our methond to expand core-collapse search horizon that can be seen in Halim, et.al. 2020. Besides, a strategy to do the joint GW-LEN analysis can also be seen in a PhD thesis of our member (Halim, 2020), where the GW analysis uses coherentWave Burst (cWB) pipeline (Necula, et.al. 2012) from LIGO-Virgo Collaboration.