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How Turbulence Enables Core-collapse Supernova Explosions

Title: How Turbulence Enables Core-collapse Supernova Explosions.
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Name(s): Mabanta, Quintin A., author
Murphy, Jeremiah W., author
Type of Resource: text
Genre: Journal Article
Text
Journal Article
Date Issued: 2018-03-20
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: An important result in core-collapse supernova (CCSN) theory is that spherically symmetric, one-dimensional simulations routinely fail to explode, yet multidimensional simulations often explode. Numerical investigations suggest that turbulence eases the condition for explosion, but how it does it is not fully understood. We develop a turbulence model for neutrino-driven convection, and show that this turbulence model reduces the condition for explosions by about 30%, in concordance with multidimensional simulations. In addition, we identify which turbulent terms enable explosions. Contrary to prior suggestions, turbulent ram pressure is not the dominant factor in reducing the condition for explosion. Instead, there are many contributing factors, with ram pressure being only one of them, but the dominant factor is turbulent dissipation (TD). Primarily, TD provides extra heating, adding significant thermal pressure and reducing the condition for explosion. The source of this TD power is turbulent kinetic energy, which ultimately derives its energy from the higher potential of an unstable convective profile. Investigating a turbulence model in conjunction with an explosion condition enables insight that is difficult to glean from merely analyzing complex multidimensional simulations. An explosion condition presents a clear diagnostic to explain why stars explode, and the turbulence model allows us to explore how turbulence enables explosion. Although we find that TD is a significant contributor to successful supernova explosions, it is important to note that this work is to some extent qualitative. Therefore, we suggest ways to further verify and validate our predictions with multidimensional simulations.
Identifier: FSU_libsubv1_wos_000428455800008 (IID), 10.3847/1538-4357/aaaec7 (DOI)
Keywords: mechanism, simulations, methods: numerical, hydrodynamics, supernovae: general, turbulence, ii supernova, convection, shock waves, methods: analytical, sasi activity, neutrino-driven supernova, progenitor, standing accretion shocks, stellar collapse
Publication Note: The publisher's version of record is available at https://doi.org/10.3847/1538-4357/aaaec7
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000428455800008
Host Institution: FSU
Is Part Of: Astrophysical Journal.
0004-637X
Issue: iss. 1, vol. 856

Choose the citation style.
Mabanta, Q. A., & Murphy, J. W. (2018). How Turbulence Enables Core-collapse Supernova Explosions. Astrophysical Journal. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000428455800008