Search Methods for Continuous Gravitational-Wave Signals from Unknown Sources in the Advanced-Detector Era

Tenorio, R.; Keitel, D.; Sintes, A. M.

doi:10.3390/universe7120474

Cited by 46 publications

(39 citation statements)

References 180 publications

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“…We also use the frequency-domain F-statistic pipeline to search for CWs in a narrow frequency and spin-down range around the source ephemerides. The F-statistic is a matched filter which is maximized over the amplitude parameters A of the quasi-monochromatic signals (Jaranowski et al 1998;Cutler & Schutz 2005); see Tenorio et al (2021a) for a review covering its applications.…”

Section: Frequency-domain F-statistic Pipelinementioning

confidence: 99%

Narrowband searches for continuous and long-duration transient gravitational waves from known pulsars in the LIGO-Virgo third observing run

Abbott,

Acernese

et al. 2021

Preprint

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Isolated neutron stars that are asymmetric with respect to their spin axis are possible sources of detectable continuous gravitational waves. This paper presents a fully-coherent search for such signals from eighteen pulsars in data from LIGO and Virgo's third observing run (O3). For known pulsars, efficient and sensitive matched-filter searches can be carried out if one assumes the gravitational radiation is phase-locked to the electromagnetic emission. In the search presented here, we relax this assumption and allow the frequency and frequency time-derivative of the gravitational waves to vary in a small range around those inferred from electromagnetic observations. We find no evidence for continuous gravitational waves, and set upper limits on the strain amplitude for each target. These limits are more constraining for seven of the targets than the spin-down limit defined by ascribing all rotational energy loss to gravitational radiation. In an additional search we look in O3 data for long-duration (hours-months) transient gravitational waves in the aftermath of pulsar glitches for six targets with a total of nine glitches. We report two marginal outliers from this search, but find no clear evidence for such emission either. The resulting duration-dependent strain upper limits do not surpass indirect energy constraints for any of these targets.

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Section: Frequency-domain F-statistic Pipelinementioning

confidence: 99%

Narrowband searches for continuous and long-duration transient gravitational waves from known pulsars in the LIGO-Virgo third observing run

Abbott,

Acernese

et al. 2021

Preprint

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“…Second, in some LMXBs including Sco X-1, which do not exhibit X-ray pulsations, f is not measured electromagnetically [1,37]. Hence a GW search must cover a wide band (width ∼ 1kHz) looking for an unknown, wandering, quasimonochromatic tone [38,39]. HMM tracking is a tried and tested method for searches of the above sort, with a long history of practical use in telecommunications [40] and remote sensing [41].…”

Section: Introductionmentioning

confidence: 99%

Search for gravitational waves from Scorpius X-1 with a hidden Markov model in O3 LIGO data

Abbott,

Abe,

Acernese

et al. 2022

Preprint

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Results are presented for a semi-coherent search for continuous gravitational waves from the lowmass X-ray binary Scorpius X-1, using a hidden Markov model (HMM) to allow for spin wandering. This search improves on previous HMM-based searches of Laser Interferometer Gravitational-wave Observatory (LIGO) data by including the orbital period in the search template grid, and by analyzing data from the latest (third) observing run (O3). In the frequency range searched, from 60 to 500 Hz, we find no evidence of gravitational radiation. This is the most sensitive search for Scorpius X-1 using a HMM to date. For the most sensitive sub-band, starting at 256.06Hz, we report an upper limit on gravitational wave strain (at 95% confidence) of h 95% 0 = 6.16 × 10 −26 , assuming the orbital inclination angle takes its electromagnetically restricted value ι = 44 • . The upper limits on gravitational wave strain reported here are on average a factor of ∼ 3 lower than in the O2 HMM search. This is the first Scorpius X-1 HMM search with upper limits that reach below the indirect torque-balance limit for certain sub-bands, assuming ι = 44 • . I.

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“…But for unknown sources, the high resolution in all the parameters makes the all-sky, broad frequency searches the most computationally costly among all gravitational-wave searches. A recent review of different methods to perform these searches can be found in Tenorio et al (2021).…”

Section: Introductionmentioning

confidence: 99%

Constraints on r-modes and Mountains on Millisecond Neutron Stars in Binary Systems

Covas

Papa

Prix

et al. 2022

ApJL

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Continuous gravitational waves are nearly monochromatic signals emitted by asymmetries in rotating neutron stars. These signals have not yet been detected. Deep all-sky searches for continuous gravitational waves from isolated neutron stars require significant computational expense. Deep searches for neutron stars in binary systems are even more expensive, but these targets are potentially more promising emitters, especially in the hundreds of Hertz region, where ground-based gravitational-wave detectors are most sensitive. We present here an all-sky search for continuous signals with frequency between 300 and 500 Hz, from neutron stars in binary systems with orbital periods between 15 and 60 days and projected semimajor axes between 10 and 40 lt-s. This is the only binary search on Advanced LIGO data that probes this frequency range. Compared to previous results, our search is over an order of magnitude more sensitive. We do not detect any signals, but our results exclude plausible and unexplored neutron star configurations, for example, neutron stars with relative deformations greater than 3 × 10−6 within 1 kpc from Earth and r-mode emission at the level of α ∼ a few 10−4 within the same distance.

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Search Methods for Continuous Gravitational-Wave Signals from Unknown Sources in the Advanced-Detector Era

Cited by 46 publications

References 180 publications

Narrowband searches for continuous and long-duration transient gravitational waves from known pulsars in the LIGO-Virgo third observing run

Narrowband searches for continuous and long-duration transient gravitational waves from known pulsars in the LIGO-Virgo third observing run

Search for gravitational waves from Scorpius X-1 with a hidden Markov model in O3 LIGO data

Constraints on r-modes and Mountains on Millisecond Neutron Stars in Binary Systems

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