Search for continuous gravitational waves from Fomalhaut b in the second Advanced LIGO observing run with a hidden Markov model
Results are presented from a semicoherent search for continuous gravitational waves from a nearby neutron star candidate, Fomalhaut b, using data collected in the second observing run of Advanced LIGO. The search is based on a hidden Markov model scheme, capable of tracking signal frequency evolution from the star's secular spin-down and stochastic timing noise simultaneously. The scheme is combined with a frequency domain matched filter (F-statistic), calculated coherently over five-day time stretches. The frequency band 100–1000 Hz is searched. After passing the above-threshold candidates through a hierarchy of vetoes, one candidate slightly above the 1% false alarm probability threshold remains for further scrutiny. No strong evidence of continuous waves is found. We present the strain upper limits in the full frequency band searched at 90% confidence level.
© 2021 American Physical Society. (Received 16 July 2020; accepted 24 December 2020; published 21 January 2021) This research has made use of 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 is funded by the U.S. National Science Foundation. Virgo is funded by the French Centre National de Recherche Scientifique (CNRS), the Italian Istituto Nazionale della Fisica Nucleare (INFN), and the Dutch Nikhef, with contributions by Polish and Hungarian institutes. The authors thank the LIGO Laboratory for providing the resources with which to conduct this search, as well as Alan Weinstein and the LIGO SURF program, the National Science Foundation, and the California Institute of Technology for sponsoring the project. The authors also thank Meg Millhouse for the review and suggestions. 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 United States National Science Foundation, and operates under cooperative agreement PHY-1764464. Advanced LIGO was built under Grant No. PHY-0823459. L. S. also acknowledges the support of the Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav), Project No. CE170100004. The authors thank all of the essential workers who put their health at risk during the COVID-19 pandemic, without whom we would not have been able to complete this work. This paper carries LIGO Document No. LIGO-P2000118.
Accepted Version - 2007.08732.pdf
Published - PhysRevD.103.023020.pdf
Supplemental Material - upper_limits_from_injection.txt
Supplemental Material - upper_limits_full_band.txt
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