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Related Experiment Videos

Models for GRBs and diverse transients.

S E Woosley1, Weiqun Zhang

  • 1Department of Astronomy and Astrophysics, University of California Santa Cruz, Santa Cruz, CA 95064, USA. woosley@ucolick.org

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|February 13, 2007
PubMed
Summary
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A single model of massive star evolution can explain diverse gamma-ray bursts (GRBs) and supernovae. Variations in stellar mass, rotation, and mass loss create different jet energies and explosion outcomes, especially in high-metallicity environments.

Area of Science:

  • Astrophysics
  • Stellar Evolution
  • High-Energy Astrophysics

Background:

  • Observational data reveal increasing diversity in gamma-ray bursts (GRBs).
  • This diversity has led to a proliferation of theoretical models for GRB progenitors.
  • A unified model could potentially explain the range of observed phenomena.

Purpose of the Study:

  • To explore if a single central engine model, operating within massive stars of variable properties, can account for the observed diversity in GRBs.
  • To investigate the relationship between jet properties and supernova brightness within a unified framework.
  • To determine the conditions favoring the production of low-energy GRBs.

Main Methods:

  • Utilizing the collapsar model as a reference for the central engine.

Related Experiment Videos

  • Simulating the generation of both narrowly collimated relativistic jets (for GRBs) and wide-angle sub-relativistic outflows (for supernovae).
  • Analyzing the impact of variable stellar mass, differential rotation rate, and mass loss rate on GRB and supernova properties.

    • Main Results:

    • A single model can produce a variety of jet energies and supernova luminosities by varying stellar parameters.
    • A lower limit of approximately 10^48 ergs^-1 is identified for the power required for a jet to escape a massive star.
    • Low-energy and 'suffocated' bursts are predicted to be more common in high-metallicity environments (modern universe, low redshift).

    Conclusions:

    • The diversity in GRBs and supernovae may stem from variations in a single massive star evolution model.
    • Stellar properties significantly influence the characteristics of both the GRB jet and the accompanying supernova.
    • High metallicity environments are likely to host more low-energy or 'suffocated' GRBs.