Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..587..173l&link_type=abstract
GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP Conference Proceedings, Volume 587, pp. 173-175 (2001).
Astronomy and Astrophysics
Astrophysics
Gamma-Ray Sources, Gamma-Ray Bursts, Supernovae, Neutron Stars, Galaxy Mergers, Collisions, And Tidal Interactions, Accretion And Accretion Disks
Scientific paper
We propose that a gamma-ray burst can result from the merger of a neutron star with a massive main-sequence star following the supernova explosion of the primary star of a binary system. The newly-formed neutron star receives a random kick during the explosion, and, in a small fraction of cases, the kick has the appropriate direction and amplitude to remove most of the orbital angular momentum from the post-supernova binary system, which results in an orbit with a pericenter distance smaller than the radius of the secondary. The neutron star rather quickly becomes embedded inside the secondary, and sinks to its center. Here the neutron star experiences runaway accretion due to neutrino losses, and collapses into a black hole, which continues to accrete from the disk that surrounds it, and produces a pair of jets that bore their way out of the merged object. Observers who lie in the direction of either jet will see a gamma-ray burst. This scenario naturally explains the iron lines in gamma-ray burst spectra due to the processed material from the supernova explosion that surrounds the burst site. .
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