Insights into non-axisymmetric instabilities in three-dimensional rotating supernova models with neutrino and gravitational-wave signatures

Abstract

We present a detailed analysis to clarify what determines the growth of the low-$T/|W|$ instability in the context of rapidly rotating core-collapse of massive stars. To this end, we perform three-dimensional core-collapse supernova (CCSN) simulations of a $27M_{\odot }$ star including several updates in the general relativistic correction to gravity, the multi-energy treatment of heavy-lepton neutrinos, and the nuclear equation of state. Non-axisymmetric deformations are analyzed from the point of view of the time evolution of the pattern frequency and the corotation radius. The corotation radius is found to coincide with the convective layer in the proto neutron star (PNS). We propose a new mechanism to account for the growth of the low-$T/|W|$ instability in the CCSN environment. Near the convective boundary where a small Brunt-Väisälä frequency is expected, Rossby waves propagating in the azimuthal direction at mid latitude induce non-axisymmetric unstable modes, in both hemispheres. They merge with each other and finally become the spiral arm in the equatorial plane. We also investigate how the growth of the low-$T/|W|$ instability impacts the neutrino and gravitational-wave signatures.

20 pages, 22 figures, submitted to MNRAS. For associated movie files, see https://doi.org/10.5281/zenodo.5463660. For the waveform data of gravitational waves, see https://doi.org/10.5281/zenodo.5489428

References in corpus (28)

• Three-dimensional core-collapse supernova simulated using a 15 $M_{\odot }$ progenitor
• Instability of a stalled accretion shock: evidence for the advective-acoustic cycle
• Neutrino-driven supernova of a low-mass iron-core progenitor boosted by three-dimensional turbulent convection
• The isotropic diffusion source approximation for supernova neutrino transport
• Nuclear equation of state for core-collapse supernova simulations with realistic nuclear forces
• Neutrino emission characteristics and detection opportunities based on three-dimensional supernova simulations
• Three-Dimensional Supernova Explosion Simulations of 9-, 10-, 11-, 12-, and 13-M${}_{\odot }$ Stars
• Rotation-supported Neutrino-driven Supernova Explosions in Three Dimensions and the Critical Luminosity Condition
• Gravitational-wave signal of a core-collapse supernova explosion of a 15 Solar mass star
• Anisotropic emission of neutrino and gravitational-wave signals from rapidly rotating core-collapse supernovae
• A systematic study of proto-neutron star convection in three-dimensional core-collapse supernova simulations
• Unexpected Dynamical Instabilities In Differentially Rotating Neutron Stars
• Gravitational waves from 3D MHD core collapse simulations
• Effect of Rotation on the Stability of a Stalled Cylindrical Shock and its Consequences for Core-Collapse Supernovae
• Gravitational wave asteroseismology with protoneutron stars
• An axis-free overset grid in spherical polar coordinates for simulating 3D self-gravitating flows
• A 3D Simulation of a Neutrino-Driven Supernova Explosion Aided By Convection and Magnetic Fields
• Dependence of outer boundary condition on protoneutron star asteroseismology with gravitational-wave signatures
• Numerical simulations of the magnetorotational instability in protoneutron stars: I. Influence of buoyancy
• Possible effects of collective neutrino oscillations in the three flavor multi-angle simulations on supernova $\nu p$ process
• Papaloizou-Pringle instability suppression by the magnetorotational instability in relativistic accretion discs
• Dimension dependence of numerical simulations on gravitational waves from protoneutron stars
• Magnetic effects on the low-T/|W| instability in differentially rotating neutron stars
• Magnetohydrodynamic Turbulence Powered by Magnetorotational Instability in Nascent Proto-Neutron Stars
• Two-dimensional numerical study for magnetic field dependence of neutrino-driven core-collapse supernova models
• The intimate relation between the low T/W instability and the co-rotation point
• Low-$T/|W|$ instabilities in differentially rotating proto-neutron stars with magnetic fields
• On a role of corotation radius in the low $T/W$ dynamical instability of differentially rotating stars

Cited by in corpus (1)

• Monotonicity of the cores of massive stars