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Effect of timing noise on targeted and narrow-band coherent searches for continuous gravitational waves from pulsars

Effect of timing noise on targeted and narrow-band coherent searches for continuous gravitational waves from pulsars
Effect of timing noise on targeted and narrow-band coherent searches for continuous gravitational waves from pulsars
Most searches for continuous gravitational waves from pulsars use Taylor expansions in the phase to model the spin-down of neutron stars. Studies of pulsars demonstrate that their electromagnetic (EM) emissions suffer from timing noise, small deviations in the phase from Taylor expansion models. How the mechanism producing EM emission is related to any continuous gravitational-wave (CW) emission is unknown; if they either interact or are locked in phase, then the CW will also experience timing noise. Any disparity between the signal and the search template used in matched filtering methods will result in a loss of signal-to-noise ratio, referred to as “mismatch.” In this work we assume the CW suffers a level of timing noise similar to its EM counterpart. We inject and recover fake CW signals, which include timing noise generated from observational data on the Crab pulsar. Measuring the mismatch over durations of order ?10 months, the effect is, for the most part, found to be small. This suggests recent so-called “narrow-band” searches which placed upper limits on the signals from the Crab and Vela pulsars will not be significantly affected. At a fixed observation time, we find the mismatch depends upon the observation epoch. Considering the averaged mismatch as a function of observation time, we find that it increases as a power law with time, and so may become relevant in long baseline searches
1550-7998
Ashton, G.
805bcbfd-ae8a-46b2-8297-f3142c3d0e7e
Jones, D. I.
b8f3e32c-d537-445a-a1e4-7436f472e160
Prix, R.
96ea3047-4071-44f4-9a9f-e9e331c61421
Ashton, G.
805bcbfd-ae8a-46b2-8297-f3142c3d0e7e
Jones, D. I.
b8f3e32c-d537-445a-a1e4-7436f472e160
Prix, R.
96ea3047-4071-44f4-9a9f-e9e331c61421

Ashton, G., Jones, D. I. and Prix, R. (2015) Effect of timing noise on targeted and narrow-band coherent searches for continuous gravitational waves from pulsars. Physical Review D, 91 (6).

Record type: Article

Abstract

Most searches for continuous gravitational waves from pulsars use Taylor expansions in the phase to model the spin-down of neutron stars. Studies of pulsars demonstrate that their electromagnetic (EM) emissions suffer from timing noise, small deviations in the phase from Taylor expansion models. How the mechanism producing EM emission is related to any continuous gravitational-wave (CW) emission is unknown; if they either interact or are locked in phase, then the CW will also experience timing noise. Any disparity between the signal and the search template used in matched filtering methods will result in a loss of signal-to-noise ratio, referred to as “mismatch.” In this work we assume the CW suffers a level of timing noise similar to its EM counterpart. We inject and recover fake CW signals, which include timing noise generated from observational data on the Crab pulsar. Measuring the mismatch over durations of order ?10 months, the effect is, for the most part, found to be small. This suggests recent so-called “narrow-band” searches which placed upper limits on the signals from the Crab and Vela pulsars will not be significantly affected. At a fixed observation time, we find the mismatch depends upon the observation epoch. Considering the averaged mismatch as a function of observation time, we find that it increases as a power law with time, and so may become relevant in long baseline searches

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PhysRevD.91.062009 - Version of Record
Available under License Creative Commons Attribution.
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Accepted/In Press date: 9 March 2015
Published date: 26 March 2015
Organisations: Applied Mathematics

Identifiers

Local EPrints ID: 404322
URI: https://eprints.soton.ac.uk/id/eprint/404322
ISSN: 1550-7998
PURE UUID: 8ae23757-e540-45b8-b057-cd8d7b05ae51

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Date deposited: 05 Jan 2017 14:19
Last modified: 08 Nov 2017 20:22

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