Details
| Original language | English |
|---|---|
| Article number | 044017 |
| Journal | Physical Review D |
| Volume | 97 |
| Issue number | 4 |
| Publication status | Published - 12 Feb 2018 |
Abstract
Continuous-wave (CW) gravitational waves (GWs) call for computationally-intensive methods. Low signal-to-noise ratio signals need templated searches with long coherent integration times and thus fine parameter-space resolution. Longer integration increases sensitivity. Low-mass x-ray binaries (LMXBs) such as Scorpius X-1 (Sco X-1) may emit accretion-driven CWs at strains reachable by current ground-based observatories. Binary orbital parameters induce phase modulation. This paper describes how resampling corrects binary and detector motion, yielding source-frame time series used for cross-correlation. Compared to the previous, detector-frame, templated cross-correlation method, used for Sco X-1 on data from the first Advanced LIGO observing run (O1), resampling is about 20× faster in the costliest, most-sensitive frequency bands. Speed-up factors depend on integration time and search setup. The speed could be reinvested into longer integration with a forecast sensitivity gain, 20 to 125 Hz median, of approximately 51%, or from 20 to 250 Hz, 11%, given the same per-band cost and setup. This paper's timing model enables future setup optimization. Resampling scales well with longer integration, and at 10× unoptimized cost could reach respectively 2.83× and 2.75× median sensitivities, limited by spin-wandering. Then an O1 search could yield a marginalized-polarization upper limit reaching torque-balance at 100 Hz. Frequencies from 40 to 140 Hz might be probed in equal observing time with 2× improved detectors.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physics and Astronomy (miscellaneous)
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In: Physical Review D, Vol. 97, No. 4, 044017, 12.02.2018.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Resampling to accelerate cross-correlation searches for continuous gravitational waves from binary systems
AU - Meadors, Grant David
AU - Krishnan, Badri
AU - Papa, Maria Alessandra
AU - Whelan, John T.
AU - Zhang, Yuanhao
N1 - This work was partly funded by the Max-Planck-Institut. J. T. W. and Y. Z. were supported by National Science Foundation Awards No. PHY-1207010 and No. PHY-1505629. J. T. W. acknowledges the hospitality of the Max Planck Institute for Gravitational Physics (Albert Einstein Institute) in Hannover. These investigations use data and computing resources from the LIGO Scientific Collaboration. Further thanks to the Albert-Einstein-Institut (AEI) Hannover and the Leibniz Universität Hannover for support of the Atlas cluster, on which most of the computing for this project was done. Many people offered helpful comments, especially R. Prix for extensive knowledge on the resampling code implementation, K. Wette for familiarity with the LIGO Applications Library, along with V. Dergachev, A. Mukherjee, K. Riles, S. Walsh, S. Zhu, E. Goetz, M. Cabero-Müller, C. Messenger, C. Aulbert, H. Fehrmann, C. Beer, O. Bock, H.-B. Eggenstein and B. Maschenschalk, L. Sun, E. Thrane, A. Melatos, Y. Levin, B. Allen, B. Schutz, and all members of the AEI and LIGO Scientific Collaboration-Virgo continuous waves (CW) groups. We also thank our referee for helpful reading and comments. This document bears LIGO Document No. DCC-P1600327.
PY - 2018/2/12
Y1 - 2018/2/12
N2 - Continuous-wave (CW) gravitational waves (GWs) call for computationally-intensive methods. Low signal-to-noise ratio signals need templated searches with long coherent integration times and thus fine parameter-space resolution. Longer integration increases sensitivity. Low-mass x-ray binaries (LMXBs) such as Scorpius X-1 (Sco X-1) may emit accretion-driven CWs at strains reachable by current ground-based observatories. Binary orbital parameters induce phase modulation. This paper describes how resampling corrects binary and detector motion, yielding source-frame time series used for cross-correlation. Compared to the previous, detector-frame, templated cross-correlation method, used for Sco X-1 on data from the first Advanced LIGO observing run (O1), resampling is about 20× faster in the costliest, most-sensitive frequency bands. Speed-up factors depend on integration time and search setup. The speed could be reinvested into longer integration with a forecast sensitivity gain, 20 to 125 Hz median, of approximately 51%, or from 20 to 250 Hz, 11%, given the same per-band cost and setup. This paper's timing model enables future setup optimization. Resampling scales well with longer integration, and at 10× unoptimized cost could reach respectively 2.83× and 2.75× median sensitivities, limited by spin-wandering. Then an O1 search could yield a marginalized-polarization upper limit reaching torque-balance at 100 Hz. Frequencies from 40 to 140 Hz might be probed in equal observing time with 2× improved detectors.
AB - Continuous-wave (CW) gravitational waves (GWs) call for computationally-intensive methods. Low signal-to-noise ratio signals need templated searches with long coherent integration times and thus fine parameter-space resolution. Longer integration increases sensitivity. Low-mass x-ray binaries (LMXBs) such as Scorpius X-1 (Sco X-1) may emit accretion-driven CWs at strains reachable by current ground-based observatories. Binary orbital parameters induce phase modulation. This paper describes how resampling corrects binary and detector motion, yielding source-frame time series used for cross-correlation. Compared to the previous, detector-frame, templated cross-correlation method, used for Sco X-1 on data from the first Advanced LIGO observing run (O1), resampling is about 20× faster in the costliest, most-sensitive frequency bands. Speed-up factors depend on integration time and search setup. The speed could be reinvested into longer integration with a forecast sensitivity gain, 20 to 125 Hz median, of approximately 51%, or from 20 to 250 Hz, 11%, given the same per-band cost and setup. This paper's timing model enables future setup optimization. Resampling scales well with longer integration, and at 10× unoptimized cost could reach respectively 2.83× and 2.75× median sensitivities, limited by spin-wandering. Then an O1 search could yield a marginalized-polarization upper limit reaching torque-balance at 100 Hz. Frequencies from 40 to 140 Hz might be probed in equal observing time with 2× improved detectors.
UR - http://www.scopus.com/inward/record.url?scp=85043711886&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.97.044017
DO - 10.1103/PhysRevD.97.044017
M3 - Article
AN - SCOPUS:85043711886
VL - 97
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 4
M1 - 044017
ER -