THE IMPACT OF PROGENITOR ASYMMETRIES ON THE NEUTRINO-DRIVEN CONVECTION IN CORE-COLLAPSE SUPERNOVAE
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Date
2020
Authors
Kazeroni, RĀ“emi
Abdikamalov, Ernazar
Journal Title
Journal ISSN
Volume Title
Publisher
arxiv
Abstract
The explosion of massive stars in core-collapse supernovae may be aided by the con vective instabilities that develop in their innermost nuclear burning shells. The re sulting fluctuations support the explosion by generating additional turbulence behind
the supernova shock. It was suggested that the buoyant density perturbations aris ing from the interaction of the pre-collapse asymmetries with the shock may be the
primary contributor to the enhancement of the neutrino-driven turbulent convection
in the post-shock region. Employing three-dimensional numerical simulations of a toy
model, we investigate the impact of such density perturbations on the post-shock tur bulence. We consider a wide range of perturbation parameters. The spatial scale and
the amplitude of the perturbations are found to be of comparable importance. The
turbulence is particularly enhanced when the perturbation frequency is close to that
of the convective turnovers in the gain region. Our analysis confirms that the buoyant
density perturbations is indeed the main source of the additional turbulence in the
gain region, validating the previous order-of-magnitude estimates.
Description
Keywords
Type of access: Open Access, convection, hydrodynamics, instabilities, turbulence, supernovae
Citation
Kazeroni, R., & Abdikamalov, E. (2020). The impact of progenitor asymmetries on the neutrino-driven convection in core-collapse supernovae. Monthly Notices of the Royal Astronomical Society, 494(4), 5360ā5373. https://doi.org/10.1093/mnras/staa944