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First narrow-band search for continuous gravitational waves from known pulsars in advanced detector data

First narrow-band search for continuous gravitational waves from known pulsars in advanced detector data
First narrow-band search for continuous gravitational waves from known pulsars in advanced detector data
Spinning neutron stars asymmetric with respect to their rotation axis are potential sources of continuous gravitational waves for ground-based interferometric detectors. In the case of known pulsars a fully coherent search, based on matched filtering, which uses the position and rotational parameters obtained from electromagnetic observations, can be carried out. Matched filtering maximizes the signal-to-noise (SNR) ratio, but a large sensitivity loss is expected in case of even a very small mismatch between the assumed and the true signal parameters. For this reason, narrow-band analysis methods have been developed, allowing a fully coherent search for gravitational waves from known pulsars over a fraction of a hertz and several spin-down values. In this paper we describe a narrow-band search of 11 pulsars using data from Advanced LIGO’s first observing run. Although we have found several initial outliers, further studies show no significant evidence for the presence of a gravitational wave signal. Finally, we have placed upper limits on the signal strain amplitude lower than the spin-down limit for 5 of the 11 targets over the bands searched; in the case of J1813-1749 the spin-down limit has been beaten for the first time. For an additional 3 targets, the median upper limit across the search bands is below the spin-down limit. This is the most sensitive narrow-band search for continuous gravitational waves carried out so far.
1550-7998
Abbott, B. P.
20b32f53-5355-40eb-9d69-91c95d56e693
Ho, Wynn
d78d4c52-8f92-4846-876f-e04a8f803a45
Jones, David
b8f3e32c-d537-445a-a1e4-7436f472e160
The LIGO Scientific Collaboration and the Virgo Collaboration
Abbott, B. P.
20b32f53-5355-40eb-9d69-91c95d56e693
Ho, Wynn
d78d4c52-8f92-4846-876f-e04a8f803a45
Jones, David
b8f3e32c-d537-445a-a1e4-7436f472e160

Abbott, B. P., Ho, Wynn and Jones, David , The LIGO Scientific Collaboration and the Virgo Collaboration (2017) First narrow-band search for continuous gravitational waves from known pulsars in advanced detector data. Physical Review D, 96 (12). (doi:10.1103/PhysRevD.96.122006).

Record type: Article

Abstract

Spinning neutron stars asymmetric with respect to their rotation axis are potential sources of continuous gravitational waves for ground-based interferometric detectors. In the case of known pulsars a fully coherent search, based on matched filtering, which uses the position and rotational parameters obtained from electromagnetic observations, can be carried out. Matched filtering maximizes the signal-to-noise (SNR) ratio, but a large sensitivity loss is expected in case of even a very small mismatch between the assumed and the true signal parameters. For this reason, narrow-band analysis methods have been developed, allowing a fully coherent search for gravitational waves from known pulsars over a fraction of a hertz and several spin-down values. In this paper we describe a narrow-band search of 11 pulsars using data from Advanced LIGO’s first observing run. Although we have found several initial outliers, further studies show no significant evidence for the presence of a gravitational wave signal. Finally, we have placed upper limits on the signal strain amplitude lower than the spin-down limit for 5 of the 11 targets over the bands searched; in the case of J1813-1749 the spin-down limit has been beaten for the first time. For an additional 3 targets, the median upper limit across the search bands is below the spin-down limit. This is the most sensitive narrow-band search for continuous gravitational waves carried out so far.

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1710.02327 - Accepted Manuscript
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Accepted/In Press date: 6 December 2017
e-pub ahead of print date: 28 December 2017

Identifiers

Local EPrints ID: 416948
URI: https://eprints.soton.ac.uk/id/eprint/416948
ISSN: 1550-7998
PURE UUID: 17e8e018-31a6-4aa3-aff9-517cd7069968
ORCID for Wynn Ho: ORCID iD orcid.org/0000-0002-6089-6836

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Date deposited: 15 Jan 2018 17:30
Last modified: 14 Mar 2019 05:20

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