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The properties of long gamma-ray bursts in massive compact binaries
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Church, Ross P., Kim, Chunglee, Levan, Andrew J. and Davies, Melvyn B. (2012) The properties of long gamma-ray bursts in massive compact binaries. Monthly Notices of the Royal Astronomical Society, Volume 425 (Number 1). pp. 470-476. doi:10.1111/j.1365-2966.2012.21480.x ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2012.21480.x
Abstract
We consider a popular model for long-duration gamma-ray bursts, in which the progenitor star, a stripped helium core, is spun up by tidal interactions with a black hole companion in a compact binary. We perform population synthesis calculations to produce a representative sample of such binaries, and model the effect that the companion has on material that falls back on to the newly formed black hole. Taking the results of hydrodynamic models of black hole formation by fallback as our starting point, we show that the companion has two principal effects on the fallback process. First, a break forms in the accretion curve at around 104โs. Secondly, subsequent to the break, we expect to see a flare of total energy around 1050โerg. We show that the break and flare times are set largely by the semimajor axis of the binary at the time of explosion, and that this correlates negatively with the flare energy. Although comparison with observations is non-trivial, we show that our predicted break times are comparable to those found in the X-ray light curves of canonical long-duration gamma-ray bursts. Similarly, the flare properties that we predict are consistent with the late-time flares observed in a subsample of bursts.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
Publisher: | Wiley | ||||
ISSN: | 0035-8711 | ||||
Official Date: | 2012 | ||||
Dates: |
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Volume: | Volume 425 | ||||
Number: | Number 1 | ||||
Page Range: | pp. 470-476 | ||||
DOI: | 10.1111/j.1365-2966.2012.21480.x | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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