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Setting Limits on Supersymmetry Using Simplified Models
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Published on: November 15, 2013

Binary progenitor models for long-duration gamma-ray bursts.

Philipp Podsiadlowski1

  • 1Department of Physics, University of Oxford, Oxford OX1 3RH, UK. podsi@astro.ox.ac.uk

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|February 13, 2007
PubMed
Summary

Long-duration gamma-ray bursts (LGRBs) are rare cosmic events. A new model involving explosive common-envelope ejection explains LGRB origins and associated phenomena, offering insights into their rates and metallicity dependence.

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Area of Science:

  • Astrophysics
  • Cosmic explosions
  • Gamma-ray astronomy

Background:

  • Long-duration gamma-ray bursts (LGRBs) are rare, requiring specific stellar evolution pathways.
  • The precise formation channels for LGRBs remain under investigation.

Purpose of the Study:

  • To review existing binary models for LGRB formation.
  • To introduce and analyze a novel model based on explosive common-envelope ejection.
  • To explain observed LGRB properties, such as the absence of helium in associated supernovae and surrounding medium density.

Main Methods:

  • Review of established binary models (tidal spin-up, binary mergers).
  • Presentation of a new model incorporating explosive common-envelope ejection.
  • Analysis of LGRB rates and metallicity dependence within different models.

Main Results:

  • The explosive common-envelope ejection model offers a potential explanation for the lack of observed helium in LGRB-related supernovae.
  • This model may also account for the constant-density environments inferred around some LGRBs.
  • The study discusses the metallicity dependence of LGRB rates for various proposed channels.

Conclusions:

  • Explosive common-envelope ejection presents a compelling new channel for long-duration gamma-ray bursts.
  • This model potentially resolves key observational puzzles associated with LGRBs.
  • Further research is needed to fully validate this model and its implications for stellar evolution and high-energy astrophysics.