Fragmentation of Collapsar Disks and the Production of Gravitational Waves
- 1 April 2007
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 658 (2), 1173-1176
- https://doi.org/10.1086/511672
Abstract
We argue that gravitational instability in the outer parts of collapsar disks may lead to fragmentation near the radius where helium photodisintegrates, because of the strong cooling provided by this process. This physics sets clear physical scales for the fragmentation conditions and the properties of gravitationally bound clumps. Collapse of a fragment proceeds until the neutrons become degenerate; a neutron star of mass ~0.1-1Msun may result. We find that tidal disruption of a fragment and accretion by the central black hole are too rapid to account for the durations of observed X-ray flares from long gamma-ray bursts. Prior to disruption, migration of the fragment is driven by gravitational radiation and disk viscosity, which act together to produce a unique gravitational-wave signature. Advanced LIGO may be able to detect such sources within ~100 Mpc.Comment: Accepted for publication in The Astrophysical Journal, 5 pages, 2 figures; added noise estimates for enhanced LIGO and expanded discussion of rateKeywords
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This publication has 39 references indexed in Scilit:
- The GRB 060218/SN 2006aj event in the context of other gamma-ray burst supernovaeAstronomy & Astrophysics, 2006
- Bright X-ray Flares in Gamma-Ray Burst AfterglowsScience, 2005
- Nuclear Composition of Gamma‐Ray Burst FireballsThe Astrophysical Journal, 2003
- Neutrino Trapping and Accretion Models for Gamma‐Ray BurstsThe Astrophysical Journal, 2002
- Low-mass companions to T Tauri stars: a mechanism for rapid-rise FU Orionis outburstsMonthly Notices of the Royal Astronomical Society, 1996
- Tidal interactions of inspiraling compact binariesThe Astrophysical Journal, 1992
- (p,γHe reaction and the (γ,p)/(γ,n) ratio inPhysical Review C, 1990
- Exploding neutron stars near the minimum massThe Astrophysical Journal, 1989
- Galactic DynamicsPhysics Today, 1988
- Absolute cross section for the photodisintegration of deuteriumPhysical Review C, 1985