Links between the shock instability in core-collapse supernovae and asymmetric accretions of envelopes

Abstract

The explosion mechanism of core-collapse supernovae has not been fully understood yet but multi-dimensional fluid instabilities such as standing accretion shock instability (SASI) and convection are now believed to be crucial for shock revival. Another multi-dimensional effect that has been recently argued is the asymmetric structures in progenitors, which are induced by violent convections in silicon/oxygen layers that occur before the onset of collapse, as revealed by recent numerical simulations of the last stage of massive star evolutions. Furthermore, it has been also demonstrated numerically that accretions of such non-spherical envelopes could facilitate shock revival. These two multi-dimensional may hence hold a key to successful explosions. In this paper, we performed a linear stability analysis of the standing accretion shock in core-collapse supernovae, taking into account non-spherical, unsteady accretion flows onto the shock to clarify the possible links between the two effects. We found that such pre-shock perturbations can excite the fluid instabilities efficiently and hence help the shock revive in core-collapse supernovae.

31 pages, 19 figures, 1 table, accepted for publication in The Astrophysical Journal

References in corpus (11)

• A large scale dynamo and magnetoturbulence in rapidly rotating core-collapse supernovae
• Instability of a stalled accretion shock: evidence for the advective-acoustic cycle
• The Role of Turbulence in Neutrino-Driven Core-Collapse Supernova Explosions
• The explosion mechanism of core-collapse supernovae: progress in supernova theory and experiments
• Three-dimensional simulations of rapidly rotating core-collapse supernovae: finding a neutrino-powered explosion aided by non-axisymmetric flows
• Idealised hydrodynamic simulations of turbulent oxygen-burning shell convection in 4π geometry
• Effect of Rotation on the Stability of a Stalled Cylindrical Shock and its Consequences for Core-Collapse Supernovae
• Stability of the Accretion Flows with Stalled Shocks in Core-Collapse Supernovae
• Shock-Turbulence Interaction in Core-Collapse Supernovae
• Critical Surface for Explosions of Rotational Core-Collapse Supernovae
• Linear analysis on the growth of non-spherical perturbations in supersonic accretion flows

Cited by in corpus (17)

• Hydrodynamics of core-collapse supernovae and their progenitors
• The gravitational wave signal from core-collapse supernovae
• Three-Dimensional Supernova Explosion Simulations of 9-, 10-, 11-, 12-, and 13-M${}_{\odot }$ Stars
• Electron-Capture and Low-Mass Iron-Core-Collapse Supernovae: New Neutrino-Radiation-Hydrodynamics Simulations
• Large-Scale Mixing in a Violent Oxygen-Neon Shell Merger Prior to a Core-Collapse Supernova
• Turbulence in Core-Collapse Supernovae
• 3D Simulations of Oxygen Shell Burning with and without Magnetic Fields
• A three-dimensional hydrodynamics simulation of oxygen-shell burning in the final evolution of a fast-rotating massive star
• The impact of vorticity waves on the shock dynamics in core-collapse supernovae
• Effects of rotation and magnetic field on the revival of a stalled shock in supernova explosions
• The impact of progenitor asymmetries on the neutrino-driven convection in core-collapse supernovae
• On the importance of progenitor asymmetry to shock revival in core-collapse supernovae
• Acoustic wave generation in collapsing massive stars with convective shells
• Impact of rotation on the evolution of convective vortices in collapsing stars
• Response of nuclear-dissociating shocks to vorticity perturbations
• Turbulence Generation by Shock-Acoustic-Wave Interaction in Core-Collapse Supernovae
• Linear Analysis of the Shock Instability in Core-collapse Supernovae: Influences of Acoustic Power and Fluctuations of Neutrino Luminosity