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Shock–turbulence interaction in core-collapse supernovae

Abdikamalov, Ernazar and Zhaksylykov, Azamat and Radice, David and Berdibek, Shapagat (2016) Shock–turbulence interaction in core-collapse supernovae. Monthly Notices of the Royal Astronomical Society, 461 (4). pp. 3864-3876. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20161014-141624442

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Abstract

Nuclear shell burning in the final stages of the lives of massive stars is accompanied by strong turbulent convection. The resulting fluctuations aid supernova explosion by amplifying the non-radial flow in the post-shock region. In this work, we investigate the physical mechanism behind this amplification using a linear perturbation theory. We model the shock wave as a one-dimensional planar discontinuity and consider its interaction with vorticity and entropy perturbations in the upstream flow. We find that, as the perturbations cross the shock, their total turbulent kinetic energy is amplified by a factor of ∼2, while the average linear size of turbulent eddies decreases by about the same factor. These values are not sensitive to the parameters of the upstream turbulence and the nuclear dissociation efficiency at the shock. Finally, we discuss the implication of our results for the supernova explosion mechanism. We show that the upstream perturbations can decrease the critical neutrino luminosity for producing explosion by several per cent.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1093/mnras/stw1604DOIArticle
http://mnras.oxfordjournals.org/content/461/4/3864.abstractPublisherArticle
https://arxiv.org/abs/1605.09015arXivDiscussion Paper
Additional Information:© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 July 1. Received 2016 July 1. In original form 2016 May 29. First published online July 5, 2016. We thank our referee, Thierry Foglizzo, for fruitful discussions and a thorough review that improved this paper. We also thank Jim Fuller and Bernhard Müller for valuable discussions and comments. This work is partially supported by ORAU and Social Policy grants at Nazarbayev University and by the Sherman Fairchild Foundation.
Group:TAPIR
Funders:
Funding AgencyGrant Number
Oak Ridge Associated UniversitiesUNSPECIFIED
Nazarbayev UniversityUNSPECIFIED
Sherman Fairchild FoundationUNSPECIFIED
Subject Keywords:hydrodynamics shock waves turbulence supernovae: general
Record Number:CaltechAUTHORS:20161014-141624442
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20161014-141624442
Official Citation:Ernazar Abdikamalov, Azamat Zhaksylykov, David Radice, and Shapagat Berdibek Shock–turbulence interaction in core-collapse supernovae MNRAS (October 01, 2016) Vol. 461 3864-3876 doi:10.1093/mnras/stw1604 first published online July 5, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71116
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:14 Oct 2016 22:15
Last Modified:14 Oct 2016 22:15

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