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Supernova, nuclear synthesis, fluid instabilities, and interfacial mixing.

Snezhana I Abarzhi1, Aklant K Bhowmick2, Annie Naveh3

  • 1Department of Mathematics and Statistics, The University of Western Australia, Perth, WA 6009, Australia; snezhana.abarzhi@gmail.com wdarnett@gmail.com.

Proceedings of the National Academy of Sciences of the United States of America
|November 28, 2018
PubMed
Summary

Supernovae explosions create instabilities that mix stellar materials, enabling heavy element synthesis. This study reveals the subdiffusive mixing and energy transport mechanisms driven by blast waves.

Keywords:
Rayleigh–Taylor instabilitiesRayleigh–Taylor interfacial mixingblast wavesnuclear synthesissupernovae

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Area of Science:

  • Astrophysics
  • Hydrodynamics
  • Nuclear Synthesis

Background:

  • Supernovae and their remnants are crucial for understanding stellar evolution and element creation.
  • Supernova explosions generate blast waves that induce instabilities, leading to significant mixing of stellar materials.
  • These instabilities disrupt spherical symmetry, facilitating the synthesis of heavy elements.

Purpose of the Study:

  • To analyze the hydrodynamic properties of Rayleigh-Taylor and Richtmyer-Meshkov instabilities under variable acceleration.
  • To investigate the subdiffusive nature of blast wave-induced interfacial mixing in supernovae.
  • To uncover the mechanisms of energy accumulation and transport at small scales within supernova remnants.

Main Methods:

  • Application of group theory analysis to study instability dynamics.
  • Focus on hydrodynamic aspects of supernova explosions.
  • Examination of interfacial mixing and energy transport at small scales.

Main Results:

  • Identified properties of Rayleigh-Taylor and Richtmyer-Meshkov dynamics with variable acceleration.
  • Discovered a subdiffusive character in blast wave-induced interfacial mixing.
  • Revealed mechanisms for energy accumulation and transport at small scales.

Conclusions:

  • Hydrodynamic instabilities play a key role in shaping supernova remnants and element synthesis.
  • The study provides new insights into the complex mixing processes and energy dynamics in supernovae.
  • Findings contribute to a deeper understanding of astrophysical phenomena and nucleosynthesis.