Response of nuclear-dissociating shocks to vorticity perturbations

Abstract

In the context of core-collapse supernova explosions (CCSNe), the interaction of standing accretion shocks with upstream vorticity perturbations is investigated by linear theory analysis. The endothermic effect associated to the nuclear dissociation, which takes place right behind the shock wave, affects the amplitude of the perturbations amplified/generated across the front. For upstream disturbances whose characteristic size is much larger than the post-shock dissociation-layer thickness, the effect of nuclear dissociation can be reduced to that of considering the global endothermic effect that scales with the inflow energy flux. The present study focuses on perturbation fields that are not isotropic, which mimic the perturbations in collapsing convective shells of massive stars. The linear interaction of the shock with bidimensional mono-frequency vorticity perturbations is theoretically addressed, with the limit of highly-stretched vortices being analyzed in detail. The exact spatial distribution of the rotational and acoustic perturbations generated in the post-shock flow are provided along with the transient evolution of the shock front. It is found that nuclear dissociation contributes to stabilize the shock oscillations, but increases the amplitude of the density perturbations downstream. An extension of this work that addresses the interaction with tridimensional isotropic turbulent flows can be found in reference Huete, C., et al. 2018, MNRAS, 475, 3305-3323, which analyzes the effect of the post-shock flow on the critical conditions that ultimately trigger explosion.

arXiv comment24 pages. Partial results presented at the TMB2017, ICTP, Italy. Submitted to Physica Scripta special issue

References in corpus (29)

• Explosion Mechanisms of Core-Collapse Supernovae
• Stability of Standing Accretion Shocks, With an Eye Toward Core Collapse Supernovae
• Physics of Core-Collapse Supernovae in Three Dimensions: a Sneak Preview
• Simulations of Magnetically-Driven Supernova and Hypernova Explosions in the Context of Rapid Rotation
• Perspectives on Core-Collapse Supernova Theory
• Magnetorotational Core-Collapse Supernovae in Three Dimensions
• Supernova Simulations from a 3D Progenitor Model -- Impact of Perturbations and Evolution of Explosion Properties
• Instability of a stalled accretion shock: evidence for the advective-acoustic cycle
• SASI Activity in Three-Dimensional Neutrino-Hydrodynamics Simulations of Supernova Cores
• Non-Radial Instabilities and Progenitor Asphericities in Core-Collapse Supernovae
• The Role of Turbulence in Neutrino-Driven Core-Collapse Supernova Explosions
• Revival of The Stalled Core-Collapse Supernova Shock Triggered by Precollapse Asphericity in the Progenitor Star
• The Status of Multi-Dimensional Core-Collapse Supernova Models
• Neutrino-driven convection versus advection in core collapse supernovae
• The Dominance of Neutrino-Driven Convection in Core-Collapse Supernovae
• The Three Dimensional Evolution to Core Collapse of a Massive Star
• The Last Minutes of Oxygen Shell Burning in a Massive Star
• Interplay of Neutrino Opacities in Core-collapse Supernova Simulations
• Three-Dimensional Simulations of SASI- and Convection-Dominated Core-Collapse Supernovae
• Impact of Neutrino Opacities on Core-Collapse Supernova Simulations
• Stability of a Spherical Accretion Shock with Nuclear Dissociation
• Turbulence in Core-Collapse Supernovae
• Dynamics of a Spherical Accretion Shock with Neutrino Heating and Alpha-Particle Recombination
• How Turbulence Enables Core-Collapse Supernova Explosions
• Shock-Turbulence Interaction in Core-Collapse Supernovae
• Properties of Convective Oxygen and Silicon Burning Shells in Supernova Progenitors
• The impact of vorticity waves on the shock dynamics in core-collapse supernovae
• Links between the shock instability in core-collapse supernovae and asymmetric accretions of envelopes
• On the importance of progenitor asymmetry to shock revival in core-collapse supernovae

Cited by in corpus (3)

• Hydrodynamics of core-collapse supernovae and their progenitors
• Acoustic wave generation in collapsing massive stars with convective shells
• Impact of rotation on the evolution of convective vortices in collapsing stars