New developments in the mechanism for core-collapse supernovae

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Recent results indicate that the standard type-2 supernova scenario in which the shock wave stagnates but is reenergized by neutrino heating fails to consistently produce supernova explosions having the required characteristics. The authors review the theory of convection and survey some recent calculations indicating the importance of convection operating on millisecond timescales in the protoneutron star. These calculations suggest that such convection is probably generic to the type-2 scenario, that this produces a violet overturn of material below the stalled shock, and that this overturn could lead to significant alterations in the neutrino luminosity and energy. This provides a mechanism ... continued below

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17 p.

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Guidry, M. December 1994.

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  • Guidry, M. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics

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Recent results indicate that the standard type-2 supernova scenario in which the shock wave stagnates but is reenergized by neutrino heating fails to consistently produce supernova explosions having the required characteristics. The authors review the theory of convection and survey some recent calculations indicating the importance of convection operating on millisecond timescales in the protoneutron star. These calculations suggest that such convection is probably generic to the type-2 scenario, that this produces a violet overturn of material below the stalled shock, and that this overturn could lead to significant alterations in the neutrino luminosity and energy. This provides a mechanism that could be effective in reenergizing the stalled shock and producing supernovae explosions having the quantitative characteristics demands by observations. This mechanism implies, in turn, that the convection cannot be adequately described by the 1-dimensional hydrodynamics employed in most simulations. Thus, a full understanding of the supernova mechanism and the resulting heavy element production is likely to require 3-dimensional relativistic hydrodynamics and a comprehensive description of neutrino transport. The prospects for implementing such calculations using a new generation of massively parallel supercomputers and modern scalable algorithms are discussed.

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17 p.

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OSTI as DE96010035

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  • 17. nuclear physics symposium, Oaxtepec (Mexico), 3-7 Jan 1994

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  • Other: DE96010035
  • Report No.: CONF-940161--3
  • Grant Number: AC05-84OR21400;FG05-87ER40361;FG05-93ER40770
  • Office of Scientific & Technical Information Report Number: 231553
  • Archival Resource Key: ark:/67531/metadc664646

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  • December 1994

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  • June 29, 2015, 9:42 p.m.

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  • May 2, 2016, 4:28 p.m.

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Guidry, M. New developments in the mechanism for core-collapse supernovae, article, December 1994; Tennessee. (digital.library.unt.edu/ark:/67531/metadc664646/: accessed July 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.