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Presupernova collapse models with improved weak-interaction rates.

A Heger1, K Langanke, G Martínez-Pinedo

  • 1UCO/Lick Observatory, University of California, Santa Cruz, 95064, USA.

Physical Review Letters
|April 6, 2001
PubMed
Summary
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New stellar weak-interaction rates reveal larger electron-to-baryon ratios and smaller iron cores in massive stars. These findings impact nucleosynthesis and supernova explosion mechanisms.

Area of Science:

  • Astrophysics
  • Stellar Evolution
  • Nuclear Astrophysics

Background:

  • Accurate stellar weak-interaction rates are crucial for modeling massive star evolution.
  • Previous models relied on older rate calculations, potentially affecting presupernova evolution predictions.

Purpose of the Study:

  • To investigate the impact of improved stellar weak-interaction rates on the presupernova evolution of massive stars (15–40 M☉).
  • To compare new models with established presupernova models and assess consequences for core collapse.

Main Methods:

  • Calculated improved weak-interaction rates using large shell-model diagonalization.
  • Incorporated new beta decay and electron capture rates into stellar evolution models.
  • Compared simulation results with standard Woosley and Weaver presupernova models.

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Main Results:

  • Significantly larger electron-to-baryon ratios at the onset of collapse were found.
  • Smaller iron core masses were predicted compared to standard models.
  • The new rates lead to substantial changes in presupernova conditions.

Conclusions:

  • Improved weak-interaction rates alter key presupernova characteristics of massive stars.
  • These alterations have significant implications for understanding nucleosynthesis and supernova mechanisms.
  • Further research is needed to fully explore the consequences for stellar explosions.