A method for detection of known sources of continuous gravitational wave signals in non-stationary data

Astone, P.; D’Antonio, S.; Frasca, S.; Palomba, C.

doi:10.1088/0264-9381/27/19/194016

Cited by 68 publications

(139 citation statements)

References 7 publications

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“…10 to estimate the detectability of the GW signal. It is possible to implement a more comprehensive coherent data analysis procedure (Cutler & Schutz 2005;Dupuis & Woan 2005;Astone et al 2010) to improve the GW signal detection (Aasi et al 2015). With such a technique, a few pulsars shown in Figure 3 may become detectable by aLIGO.…”

Section: Galactic Pulsars and Magnetarsmentioning

confidence: 99%

Magnetic-distortion-induced Ellipticity and Gravitational Wave Radiation of Neutron Stars: Millisecond Magnetars in Short GRBs, Galactic Pulsars, and Magnetars

Gao

Cao

Zhang

2017

ApJ

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Neutron stars may sustain a non-axisymmetric deformation due to magnetic distortion and are potential sources of continuous gravitational waves (GWs) for ground-based interferometric detectors. With decades of searches using available GW detectors, no evidence of a GW signal from any pulsar has been observed. Progressively stringent upper limits of ellipticity have been placed on Galactic pulsars. In this work, we use the ellipticity inferred from the putative millisecond magnetars in short gamma-ray bursts (SGRBs) to estimate their detectability by current and future GW detectors. For ∼ 1 ms magnetars inferred from the SGRB data, the detection horizon is ∼ 30 Mpc and ∼ 600 Mpc for advanced LIGO (aLIGO) and Einstein Telescope (ET), respectively. Using the ellipticity of SGRB millisecond magnetars as calibration, we estimate the ellipticity and gravitational wave strain of Galactic pulsars and magnetars assuming that the ellipticity is magnetic-distortioninduced. We find that the results are consistent with the null detection results of Galactic pulsars and magnetars with the aLIGO O1. We further predict that the GW signals from these pulsars/magnetars may not be detectable by the currently designed aLIGO detector. The ET detector may be able to detect some relatively low frequency signals (< 50 Hz) from some of these pulsars. Limited by its design sensitivity, the eLISA detector seems not suitable for detecting the signals from Galactic pulsars and magnetars.

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Section: Galactic Pulsars and Magnetarsmentioning

confidence: 99%

Magnetic-distortion-induced Ellipticity and Gravitational Wave Radiation of Neutron Stars: Millisecond Magnetars in Short GRBs, Galactic Pulsars, and Magnetars

Gao

Cao

Zhang

2017

ApJ

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“…A non-axisymmetric neutron star steadily spinning about one of its principal axis emits a quadrupolar gravitational-wave signal at twice the star rotational frequency f rot , which at the detector can be described [12] as…”

Section: The Gravitational Wave Signalmentioning

confidence: 99%

“…where the coefficients depend on the source position and detector position and orientation on the Earth [12].…”

Section: The Gravitational Wave Signalmentioning

confidence: 99%

“…are built, see [3,12] for more details. They correspond to computing matched filters between the data and the signal templates, and it can be shown, assuming the noise is Gaussian with mean value zero, that they are estimators of the signal plus and cross complex amplitudes H 0 e ıΦ0 H + , H 0 e ıΦ0 H × .…”

Section: Search Descriptionmentioning

confidence: 99%

“…If S max is compatible with noise at a given confidence level, e.g. 1%, we compute an upper limit on signal strength, using the same method described in [4], otherwise in case of detection signal parameters are estimated through suitable combinations of the real and imaginary parts ofĤ + andĤ × , as explained in [12].…”

Section: Search Descriptionmentioning

confidence: 99%

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Narrow-band search of continuous gravitational-wave signals from Crab and Vela pulsars in Virgo VSR4 data

Aasi¹,

Abbott²,

Abbott³

et al. 2015

Phys. Rev. D

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In this paper we present the results of a coherent narrow-band search for continuous gravitationalwave signals from the Crab and Vela pulsars conducted on Virgo VSR4 data. In order to take into account a possible small mismatch between the gravitational wave frequency and two times the star rotation frequency, inferred from measurement of the electromagnetic pulse rate, a range of 0.02 Hz around two times the star rotational frequency has been searched for both the pulsars. No evidence for a signal has been found and 95% confidence level upper limits have been computed both assuming polarization parameters are completely unknown and that they are known with some uncertainty, as derived from X-ray observations of the pulsar wind torii. For Vela the upper limits are comparable to the spin-down limit, computed assuming that all the observed spin-down is due to the emission of gravitational waves. For Crab the upper limits are about a factor of two below the spin-down limit, and represent a significant improvement with respect to past analysis. This is the first time the spin-down limit is significantly overcome in a narrow-band search.

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Observational results from the LIGO and Virgo detectors

Bizouard

2014

Gen Relativ Gravit

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On behalf of the LIGO Scientific Collaboration and the Virgo Collaboration.International audienceThe first generation of ground-based interferometric gravitational wave detectors, LIGO, GEO and Virgo, have operated and taken data at their design sensitivities over the last few years. The data have been examined for the presence of gravitational wave signals. While no gravitational wave events have been found important astrophysical statements can be made. The most significant results are presented in this article. The network of detectors is currently being upgraded and extended. This upgrade will provide the sensitivity needed for the direct detection of an astrophysical source emitting gravitational waves. For instance, the binary neutron stars inspiral distance range will reach 200 Mpc when upgraded detectors reach their design sensitivities circa 2020. The capability of the global network to determine accurately the sky location of the source is opening a new window on the Universe, where gravitational alerts will be used for quick electro-magnetic follow-ups of the sources

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A method for detection of known sources of continuous gravitational wave signals in non-stationary data

Cited by 68 publications

References 7 publications

Magnetic-distortion-induced Ellipticity and Gravitational Wave Radiation of Neutron Stars: Millisecond Magnetars in Short GRBs, Galactic Pulsars, and Magnetars

Magnetic-distortion-induced Ellipticity and Gravitational Wave Radiation of Neutron Stars: Millisecond Magnetars in Short GRBs, Galactic Pulsars, and Magnetars

Narrow-band search of continuous gravitational-wave signals from Crab and Vela pulsars in Virgo VSR4 data

Observational results from the LIGO and Virgo detectors

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