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Detonability Of White Dwarf Plasma

Title: Detonability Of White Dwarf Plasma: Turbulence Models At Low Densities.
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Name(s): Fenn, D., author
Plewa, T., author
Type of Resource: text
Genre: Journal Article
Text
Journal Article
Date Issued: 2017-06
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: We study the conditions required to produce self-sustained detonations in turbulent, carbon-oxygen degenerate plasma at low densities. We perform a series of three-dimensional hydrodynamic simulations of turbulence driven with various degrees of compressibility. The average conditions in the simulations are representative of models of merging binary white dwarfs. We find that material with very short ignition times is abundant in case turbulence is driven compressively. This material forms contiguous structures that persist overmany ignition times, and that we identify as prospective detonation kernels. Detailed analysis of prospective kernels reveals that these objects are centrally condensed and their shape is characterized by low curvature, supportive of self-sustained detonations. The key characteristic of the newly proposed detonation mechanism is thus high degree of compressibility of turbulent drive. The simulated detonation kernels have sizes notably smaller than the spatial resolution of any white dwarf merger simulation performed to date. The resolution required to resolve kernels is 0.1 km. Our results indicate a high probability of detonations in such well-resolved simulations of carbon-oxygen white dwarf mergers. These simulations will likely produce detonations in systems of lower total mass, thus broadening the population of white dwarf binaries capable of producing Type Ia supernovae. Consequently, we expect a downward revision of the lower limit of the total merger mass that is capable of producing a prompt detonation. We review application of the new detonation mechanism to various explosion scenarios of single, Chandrasekhar-mass white dwarfs.
Identifier: FSU_libsubv1_wos_000399429600007 (IID), 10.1093/mnras/stx524 (DOI)
Keywords: evolution, 3-dimensional simulations, deflagration phase, delayed-detonation, flames, gravitationally confined detonation, high-resolution, hydrodynamics, ia supernova explosion, nuclear reactions, nucleosynthesis, abundances, numerical simulations, shock waves, supernovae: general, thermonuclear supernovae, turbulence, white dwarfs
Publication Note: The publisher's version of record is available at https://doi.org/10.1093/mnras/stx524
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000399429600007
Owner Institution: FSU
Is Part Of: Monthly Notices of the Royal Astronomical Society.
0035-8711
Issue: iss. 2, vol. 468

Choose the citation style.
Fenn, D., & Plewa, T. (2017). Detonability Of White Dwarf Plasma: Turbulence Models At Low Densities. Monthly Notices Of The Royal Astronomical Society. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000399429600007