Journal
PHYSICAL REVIEW D
Volume 99, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.99.122002
Keywords
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Funding
- United States National Science Foundation (NSF)
- Science and Technology Facilities Council (STFC) of the United Kingdom
- Max-Planck-Society (MPS)
- State of Niedersachsen/Germany
- Australian Research Council
- Italian Istituto Nazionale di Fisica Nucleare (INFN)
- French Centre National de la Recherche Scientifique (CNRS)
- Foundation for Fundamental Research on Matter
- Netherlands Organisation for Scientific Research
- European Gravitational Observatory consortium
- Council of Scientific and Industrial Research of India
- Department of Science and Technology, India
- Science & Engineering Research Board, India
- Ministry of Human Resource Development, India
- Vicepresidencia i Conselleria d'Innovacio, Recerca i Turisme
- Conselleria d'Educacio i Universitat del Govern de les Illes Balears
- Conselleria d'Educacio, Investigacio, Cultura i Esport de la Generalitat Valenciana
- National Science Centre of Poland
- Swiss National Science Foundation
- Russian Foundation for Basic Research
- Russian Science Foundation
- European Commission
- European Regional Development Funds
- Royal Society
- Scottish Funding Council
- Scottish Universities Physics Alliance
- Hungarian Scientific Research Fund
- Lyon Institute of Origins
- National Research, Development and Innovation Office Hungary
- National Research Foundation of Korea, Industry Canada
- Province of Ontario through the Ministry of Economic Development and Innovation
- Natural Science and Engineering Research Council Canada
- Canadian Institute for Advanced Research
- Research Grants Council of Hong Kong
- Leverhulme Trust
- Ministry of Science and Technology, Taiwan
- Kavli Foundation
- NSF
- CNRS
- National Aeronautics and Space Administration
- LIGO Document [LIGO-P1800391]
- EPSRC [2161515] Funding Source: UKRI
- STFC [ST/H002006/1, ST/P000649/1, 1947165, 2142081, ST/N005422/1, ST/K000845/1, ST/T000147/1, ST/K005014/1, ST/N005430/1, 1654298, 1653089, ST/I006269/1, ST/N000633/1, 1938553, 1802888, ST/N005406/2, ST/R00045X/1, ST/N005406/1, ST/K005014/2, ST/V001396/1, 1945971, 1802894, PPA/G/S/2002/00652, ST/N000072/1, 1947199, ST/S000550/1, ST/J00166X/1, 2039699, Gravitational Waves] Funding Source: UKRI
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Isolated spinning neutron stars, asymmetric with respect to their rotation axis, are expected to be sources of continuous gravitational waves. The most sensitive searches for these sources are based on accurate matched filtering techniques that assume the continuous wave to be phase locked with the pulsar beamed emission. While matched filtering maximizes the search sensitivity, a significant signal-to-noise ratio loss will happen in the case of a mismatch between the assumed and the true signal phase evolution. Narrow-band algorithms allow for a small mismatch in the frequency and spin-down values of the pulsar while coherently integrating the entire dataset. In this paper, we describe a narrow-band search using LIGO O2 data for the continuous wave emission of 33 pulsars. No evidence of a continuous wave signal is found, and upper limits on the gravitational wave amplitude over the analyzed frequency and spin-down ranges are computed for each of the targets. In this search, we surpass the spin-down limit, namely, the maximum rotational energy loss due to gravitational waves emission for some of the pulsars already present in the LIGO O1 narrow-band search, such as J1400 - 6325, J1813 - 1246, J1833 - 1034, J1952 + 3252, and for new targets such as J0940 - 5428 and J1747 - 2809. For J1400 - 6325, J1833 - 1034, and J1747 - 2809, this is the first time the spin-down limit is surpassed.
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