Long-term gravitational wave asteroseismology of supernova: from core collapse to 20 seconds postbounce

Understand

We use an asteroseismology method to calculate the frequencies of gravitational waves in a long-term core-collapse supernova simulation, with a mass of 9.6 $M_\odot$.

• The simulation, which includes neutrino transport in general relativity is performed from core-collapse, bounce, explosion and cooling of protoneutron stars (PNSs) up to 20 s after the bounce self-consistently.
• Based on the hydrodynamics background, we calculate eigenmodes of the PNS oscillation through a perturbation analysis on fluid and metric.
• We classify the modes by the number of nodes and find that there are several eigenmodes.