Search method for long-duration gravitational-wave transients from neutron stars - INSPIRE

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Search method for long-duration gravitational-wave transients from neutron stars

Apr, 2011

20 pages

Published in:

Phys.Rev.D 84 (2011) 023007

e-Print:

1104.1704 [gr-qc]

DOI:

10.1103/PhysRevD.84.023007

Report number:

LIGO-P1100002-V2

View in:

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Abstract: (arXiv)

We introduce a search method for a new class of gravitational-wave signals, namely long-duration O(hours - weeks) transients from spinning neutron stars. We discuss the astrophysical motivation from glitch relaxation models and we derive a rough estimate for the maximal expected signal strength based on the superfluid excess rotational energy. The transient signal model considered here extends the traditional class of infinite-duration continuous-wave signals by a finite start-time and duration. We derive a multi-detector Bayes factor for these signals in Gaussian noise using \F-statistic amplitude priors, which simplifies the detection statistic and allows for an efficient implementation. We consider both a fully coherent statistic, which is computationally limited to directed searches for known pulsars, and a cheaper semi-coherent variant, suitable for wide parameter-space searches for transients from unknown neutron stars. We have tested our method by Monte-Carlo simulation, and we find that it outperforms orthodox maximum-likelihood approaches both in sensitivity and in parameter-estimation quality.

Note:

20 pages, 9 figures/ submitted to PRD

04.30.-w
07.05.Kf
04.80.Nn
04.30.Tv
numerical calculations: Monte Carlo
neutron star: rotation
gravitational radiation: direct detection

References(42)

Figures(17)

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