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Application of hidden Markov model tracking to the search for long-duration transient gravitational waves from the remnant of the binary neutron star merger GW170817

Sun, Ling and Melatos, Andrew (2019) Application of hidden Markov model tracking to the search for long-duration transient gravitational waves from the remnant of the binary neutron star merger GW170817. Physical Review D, 99 (12). Art. No. 123003. ISSN 2470-0010. doi:10.1103/PhysRevD.99.123003.

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The nature of the postmerger remnant of GW170817, the first binary neutron star coalescence observed by the Advanced Laser Interferometer Gravitational Wave Observatory (Advanced LIGO) and Advanced Virgo, is unknown. Searches have been carried out for short (≲1  s), intermediate (≲500  s), and long (∼ days) signals using various algorithms without yielding a detection. We describe an efficient frequency tracking scheme based on a hidden Markov model to search for long-duration transient signals from a neutron star remnant with spin-down timescale in the range ∼10^2  s–10^4  s. The method was used to the search for a signal from GW170817. We validate the method and estimate its sensitivity through Monte Carlo simulations on the same data set as used in the GW170817 search. We describe the search configuration and follow-up procedure step by step. The search achieves an astrophysical reach of ∼1  Mpc and hence cannot detect a source like GW170817 (40^(+8)_(−14)  Mpc), given the current sensitivities of Advanced LIGO and Advanced Virgo. The methodology of the hidden Markov model is described fully to ensure that future analyses of this kind can be reproduced by an independent party.

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Sun, Ling0000-0001-7959-892X
Additional Information:© 2019 American Physical Society. Received 8 October 2018; published 6 June 2019. We are grateful to Karl Wette and Grant Meadors for their comprehensive formal review of the code and validation of the method. We are also grateful to David Keitel, the LVC postmerger analysis group, and the Continuous Wave Working Group for detailed comments and informative discussions. L. S. is a member of the LIGO Laboratory. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation, and operates under Cooperative Agreement No. PHY-0757058. Advanced LIGO was built under Grant No. PHY-0823459. L. S. was supported by an Australian Research Training Program Scholarship and the Albert Shimmins Fund at earlier stages of this project. The research is also supported by Australian Research Council (ARC) Discovery Project No. DP170103625 and the ARC Centre of Excellence for Gravitational Wave Discovery CE170100004. This paper carries LIGO Document No. LIGO-P1800291.
Funding AgencyGrant Number
Australian Research Training ProgramUNSPECIFIED
Albert Shimmins FundUNSPECIFIED
Australian Research CouncilDP170103625
Australian Research CouncilCE170100004
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LIGO DocumentLIGO-P1800291
Issue or Number:12
Record Number:CaltechAUTHORS:20190607-082637111
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96197
Deposited By: Tony Diaz
Deposited On:07 Jun 2019 17:00
Last Modified:16 Nov 2021 17:18

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