A Parametric Study of the Acoustic Mechanism for Core-Collapse Supernovae

Abstract

We investigate the criterion for the acoustic mechanism to work successfully in core-collapse supernovae. The acoustic mechanism is an alternative to the neutrino-heating mechanism. It was proposed by Burrows et al., who claimed that acoustic waves emitted by $g$-mode oscillations in proto-neutron stars (PNS) energize a stalled shock wave and eventually induce an explosion. Previous works mainly studied to which extent the $g$-modes are excited in the PNS. In this paper, on the other hand, we investigate how strong the acoustic wave needs to be if it were to revive a stalled shock wave. By adding the acoustic power as a new axis, we draw a critical surface, an extension of the critical curve commonly employed in the context of neutrino heating. We perform both 1D and 2D parametrized simulations, in which we inject acoustic waves from the inner boundary. In order to quantify the power of acoustic waves, we use the extended Myers theory to take neutrino reactions into proper account. We find for the 1D simulations that rather large acoustic powers are required to relaunch the shock wave, since the additional heating provided by the secondary shocks developed from acoustic waves is partially canceled by the neutrino cooling that is also enhanced. In 2D, the required acoustic powers are consistent with those of Burrows et al. Our results seem to imply, however, that it is the sum of neutrino heating and acoustic powers that matters for shock revival.

20 pages, 19 figures, accepted by ApJ

References in corpus (14)

• Physics of Core-Collapse Supernovae in Three Dimensions: a Sneak Preview
• Delayed neutrino-driven supernova explosions aided by the standing accretion-shock instability
• The Role of Turbulence in Neutrino-Driven Core-Collapse Supernova Explosions
• Neutrino-driven supernova of a low-mass iron-core progenitor boosted by three-dimensional turbulent convection
• Features of the Acoustic Mechanism of Core-Collapse Supernova Explosions
• Neutrino emission characteristics and detection opportunities based on three-dimensional supernova simulations
• The Dynamics of Neutrino-Driven Supernova Explosions after Shock Revival in 2D and 3D
• Two-Dimensional Core-Collapse Supernova Models with Multi-Dimensional Transport
• Three-dimensional Boltzmann-Hydro code for core-collapse in massive stars I. special relativistic treatments
• Multi-Dimensional Explorations in Supernova Theory
• Nonlinear Saturation of g-modes in Proto-Neutron Stars: Quieting the Acoustic Engine
• Standing Accretion Shocks in the Supernova Core: Effects of Convection and Realistic EOS
• Critical Surface for Explosions of Rotational Core-Collapse Supernovae
• The g-mode Excitation in the Proto Neutron Star by the Standing Accretion Shock Instability

Cited by in corpus (3)

• Wave heating from proto-neutron star convection and the core-collapse supernova explosion mechanism
• The Antesonic Condition for the Explosion of Core-Collapse Supernovae II: Rotation and Turbulence
• Scalar Gravitational Wave Signals from Core Collapse in Massive Scalar-Tensor Gravity with Triple-Scalar Interactions