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The properties of long gamma-ray bursts in massive compact binaries

Church, Ross LU ; Kim, Chunglee LU ; Levan, Andrew J. and Davies, Melvyn B LU (2012) In Monthly Notices of the Royal Astronomical Society 425(1). p.470-476
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 104?s. Secondly, subsequent to the break, we expect to see a flare of total energy around 1050?erg. We show... (More)
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 104?s. Secondly, subsequent to the break, we expect to see a flare of total energy around 1050?erg. 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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
binaries: close, stars: evolution, gamma-ray burst: general, stars:, supernovae: general
in
Monthly Notices of the Royal Astronomical Society
volume
425
issue
1
pages
470 - 476
publisher
Wiley-Blackwell
external identifiers
  • wos:000307887300055
  • scopus:84865367552
ISSN
1365-2966
DOI
10.1111/j.1365-2966.2012.21480.x
language
English
LU publication?
yes
id
75c7605a-2b0b-404f-819f-67e7804a9e23 (old id 3147764)
date added to LUP
2012-10-29 12:21:15
date last changed
2017-08-20 03:13:45
@article{75c7605a-2b0b-404f-819f-67e7804a9e23,
  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 104?s. Secondly, subsequent to the break, we expect to see a flare of total energy around 1050?erg. 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.},
  author       = {Church, Ross and Kim, Chunglee and Levan, Andrew J. and Davies, Melvyn B},
  issn         = {1365-2966},
  keyword      = {binaries: close,stars: evolution,gamma-ray burst: general,stars:,supernovae: general},
  language     = {eng},
  number       = {1},
  pages        = {470--476},
  publisher    = {Wiley-Blackwell},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {The properties of long gamma-ray bursts in massive compact binaries},
  url          = {http://dx.doi.org/10.1111/j.1365-2966.2012.21480.x},
  volume       = {425},
  year         = {2012},
}