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Title: Type Ia supernovae deflagration-to-detonation transition explosions powered by the Zel’dovich reactivity gradient mechanism

Abstract

ABSTRACT Our aim in this work is to identify and explain the necessary conditions required for an energetic explosion of a Chandrasekhar-mass white dwarf. We construct and analyse weakly compressible turbulence models with nuclear burning effects for carbon/oxygen plasma at a density expected for the deflagration-to-detonation transition (DDT) to occur. We observe the formation of carbon deflagrations and transient carbon detonations at early times. As turbulence becomes increasingly inhomogeneous, sustained carbon detonations are initiated by the Zel’dovich reactivity gradient mechanism. The fuel is suitably preconditioned by the action of compressive turbulent modes with wavelength comparable to the size of resolved turbulent eddies; no acoustic wave is involved in this process. Oxygen detonations are initiated, aided either by reactivity gradients or by collisions of carbon detonations. The observed evolutionary time-scales are found to be sufficiently short for the above process to occur in the expanding, centrally ignited massive white dwarf. The inhomogeneous conditions produced prior to the DDT might be of consequence for the chemical composition of the outer ejecta regions of Type Ia supernovae from the single degenerate channel, and offer the potential for validation of the proposed model.

Authors:
 [1]; ORCiD logo [1];  [2]
  1. Department of Scientific Computing, Florida State University, Tallahassee, FL 32306, USA
  2. Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1737669
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society: Letters
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society: Letters Journal Volume: 501 Journal Issue: 1; Journal ID: ISSN 1745-3925
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Brooker, E., Plewa, T., and Fenn, D.. Type Ia supernovae deflagration-to-detonation transition explosions powered by the Zel’dovich reactivity gradient mechanism. United Kingdom: N. p., 2020. Web. https://doi.org/10.1093/mnrasl/slaa141.
Brooker, E., Plewa, T., & Fenn, D.. Type Ia supernovae deflagration-to-detonation transition explosions powered by the Zel’dovich reactivity gradient mechanism. United Kingdom. https://doi.org/10.1093/mnrasl/slaa141
Brooker, E., Plewa, T., and Fenn, D.. Thu . "Type Ia supernovae deflagration-to-detonation transition explosions powered by the Zel’dovich reactivity gradient mechanism". United Kingdom. https://doi.org/10.1093/mnrasl/slaa141.
@article{osti_1737669,
title = {Type Ia supernovae deflagration-to-detonation transition explosions powered by the Zel’dovich reactivity gradient mechanism},
author = {Brooker, E. and Plewa, T. and Fenn, D.},
abstractNote = {ABSTRACT Our aim in this work is to identify and explain the necessary conditions required for an energetic explosion of a Chandrasekhar-mass white dwarf. We construct and analyse weakly compressible turbulence models with nuclear burning effects for carbon/oxygen plasma at a density expected for the deflagration-to-detonation transition (DDT) to occur. We observe the formation of carbon deflagrations and transient carbon detonations at early times. As turbulence becomes increasingly inhomogeneous, sustained carbon detonations are initiated by the Zel’dovich reactivity gradient mechanism. The fuel is suitably preconditioned by the action of compressive turbulent modes with wavelength comparable to the size of resolved turbulent eddies; no acoustic wave is involved in this process. Oxygen detonations are initiated, aided either by reactivity gradients or by collisions of carbon detonations. The observed evolutionary time-scales are found to be sufficiently short for the above process to occur in the expanding, centrally ignited massive white dwarf. The inhomogeneous conditions produced prior to the DDT might be of consequence for the chemical composition of the outer ejecta regions of Type Ia supernovae from the single degenerate channel, and offer the potential for validation of the proposed model.},
doi = {10.1093/mnrasl/slaa141},
journal = {Monthly Notices of the Royal Astronomical Society: Letters},
number = 1,
volume = 501,
place = {United Kingdom},
year = {2020},
month = {12}
}

Journal Article:
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https://doi.org/10.1093/mnrasl/slaa141

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