Issue |
A&A
Volume 524, December 2010
|
|
---|---|---|
Article Number | A4 | |
Number of page(s) | 5 | |
Section | Astrophysical processes | |
DOI | https://doi.org/10.1051/0004-6361/201014882 | |
Published online | 19 November 2010 |
Gravitational radiation from precessing accretion disks in gamma-ray bursts
1
Instituto Argentino de Radioastronomía (IAR),
CCT La Plata (CONICET), C.C.5, (1894) Villa
Elisa,
Buenos Aires,
Argentina
e-mail: romero@iar-conicet.gov.ar
2
Facultad de Ciencias Astronómicas y Geofísicas, Universidad
Nacional de La Plata, Paseo del
Bosque s/n, 1900
La Plata,
Argentina
3
Instituto de Investigaciones Físicas de Mar del Plata (CONICET -
UNMdP), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del
Plata, Dean Funes 3350,
(7600)
Mar del Plata,
Argentina
4
State University of Ceará, Physics Dept., Av. Paranjana 1700,
60740-000
Fortaleza -
CE,
Brazil
Received:
28
April
2010
Accepted:
30
August
2010
Context. We study the precession of accretion disks in the context of gamma-ray burst inner engines.
Aims. Our aim is to quantitatively estimate the characteristics of gravitational waves produced by the precession of the transient accretion disk in gamma-ray bursts.
Methods. We evaluate the possible periods of disk precession caused by the Lense-Thirring effect using an accretion disk model that allows for neutrino cooling. Assuming jet ejection perpendicular to the disk plane and a typical intrinsic time-dependence for the burst, we find gamma-ray light curves that have a temporal microstructure similar to that observed in some reported events. The parameters obtained for the precession are then used to evaluate the production of gravitational waves.
Results. We find that the precession of accretion disks of outer radius smaller than 108 cm and accretion rates above 1 M⊙ s-1 could be detected by Advanced LIGO if they occur at distances of less than 100 Mpc.
Conclusions. We conclude that the precession of a neutrino-cooled accretion disk in long gamma-ray bursts can be probed by gravitational wave astronomy. Precession of the disks in short gamma-ray events is undetectable with the current technology.
Key words: gamma-ray burst: general / accretion, accretion disks / gravitational waves
© ESO, 2010
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