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Gamma-ray burst models.

Andrew King1

  • 1Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK. ark@astro.le.ac.uk

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|February 13, 2007
PubMed
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This study explores neutron star and massive white dwarf binaries as a source for long-duration gamma-ray bursts (GRBs). These systems offer a new explanation for GRBs without supernovae, potentially being quite common cosmic events.

Area of Science:

  • Astrophysics
  • High-Energy Astronomy
  • Binary Star Systems

Background:

  • Gamma-ray bursts (GRBs) are powerful cosmic explosions.
  • Neutron star-neutron star and black hole-neutron star mergers are leading candidates for short GRBs.
  • The origin of long-duration GRBs, especially those without supernovae, remains an active area of research.

Purpose of the Study:

  • To investigate alternative progenitor systems for gamma-ray bursts.
  • To explore the potential of neutron star-massive white dwarf binaries as a source for long-duration GRBs.
  • To explain recent observations of GRBs without accompanying supernovae.

Main Methods:

  • Theoretical modeling of close binary systems.
  • Analysis of progenitor system properties and their implications for GRB emission.

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  • Comparison of theoretical predictions with observational data of GRBs.

    • Main Results:

    • Neutron star-massive white dwarf binaries are identified as plausible progenitors for long-duration GRBs.
    • These systems can produce GRBs without associated supernovae, consistent with recent observations.
    • Such GRBs are expected to correlate with star formation but rare instances may occur in any galaxy type.

    Conclusions:

    • Neutron star-massive white dwarf binaries represent a significant, potentially common, channel for producing long-duration GRBs.
    • The absence of a supernova is a key signature that can be more easily established for nearby bursts.
    • This progenitor class offers a compelling explanation for a subset of observed gamma-ray bursts.