Journal article
Deep exploration for continuous gravitational waves at 171-172 Hz in LIGO second observing run data DEEP EXPLORATION for CONTINUOUS GRAVITATIONAL ... WETTE et al.
K Wette, L Dunn, P Clearwater, A Melatos
Physical Review D | AMER PHYSICAL SOC | Published : 2021
Abstract
We pursue a novel strategy toward a first detection of continuous gravitational waves from rapidly rotating deformed neutron stars. Computational power is focused on a narrow region of signal parameter space selected by a strategically chosen benchmark. We search data from the second observing run of the LIGO Observatory with an optimized analysis run on graphics processing units. While no continuous waves are detected, the search achieves a sensitivity to gravitational wave strain of h0=1.01×10-25 at 90% confidence, 24%-69% better than past searches of the same parameter space. Constraints on neutron star deformity are within theoretical maxima; thus, a detection by this search was not inco..
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Grants
Awarded by National Science Foundation
Funding Acknowledgements
We thank Hannah Middleton for helpful comments on the manuscript. This research was supported by the Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav) through Project No. CE170100004. It used data, software and/or Web tools obtained from the Gravitational Wave Open Science Center, a service of LIGO Laboratory, the LIGO Scientific Collaboration and the Virgo Collaboration. LIGO Laboratory and Advanced LIGO are funded by the United States National Science Foundation (NSF) as well as the Science and Technology Facilities Council (STFC) of the United Kingdom, the Max-Planck-Society (MPS), and the State of Niedersachsen, Germany, for support of the construction of Advanced LIGO and construction and operation of the GEO600 detector. Additional support for Advanced LIGO was provided by the Australian Research Council. Virgo is funded, through the European Gravitational Observatory (EGO), by the French Centre National de Recherche Scientifique (CNRS), the Italian Istituto Nazionale della Fisica Nucleare (INFN) and the Dutch Nikhef, with contributions by institutions from Belgium, Germany, Greece, Hungary, Ireland, Japan, Monaco, Poland, Portugal, and Spain. It used the software packages LALSuite [63], Octave [64], OctApps [65], PYTHON [66], NumPy [67], Matplotlib [68], and SciPy [69]. The search was performed on the OzSTAR national facility at Swinburne University of Technology. The OzSTAR program receives funding in part from the Astronomy National Collaborative Research Infrastructure Strategy (NCRIS) allocation provided by the Australian Government. Document number LIGO-P2000536.