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Search for gravitational wave signals from known pulsars in LIGO-Virgo O3 data using the 5n-vector ensemble method

Luca D’Onofrio1,*, Rosario De Rosa2,3, Cristiano Palomba1, Paola Leaci1,4, Ornella J. Piccinni5, Valeria Sequino2,3, Luciano Errico2,3, Lucia Trozzo3, Jim Palfreyman6 et al.

James W. McKee7,8, Bradley W. Meyers9, Ingrid Stairs10, Lucas Guillemot11,12, Ismaël Cognard11,12, Gilles Theureau11,12,13, Michael J. Keith14, Andrew Lyne14, Chris Flynn15, and Ben Stappers14

  • 1INFN, Sezione di Roma, I-00185 Roma, Italy
  • 2Università di Napoli “Federico II,” I-80126 Napoli, Italy
  • 3INFN, Sezione di Napoli, I-80126 Napoli, Italy
  • 4Università di Roma “Sapienza,” I-00185 Roma, Italy
  • 5Institut de Fisica d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra (Barcelona), Spain
  • 6University of Tasmania, Hobart TAS 7005, Australia
  • 7E.A. Milne Centre for Astrophysics, University of Hull, Cottingham Road, Kingston-upon-Hull HU6 7RX, United Kingdom
  • 8Centre of Excellence for Data Science, Artificial Intelligence and Modelling (DAIM), University of Hull, Cottingham Road, Kingston-upon-Hull HU6 7RX, United Kingdom
  • 9International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, Western Australia 6102, Australia
  • 10Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia V6J 2B1, Canada
  • 11Laboratoire de Physique et Chimie de l’Environnement et de l’Espace, Université d’Orléans/CNRS, F-45071 Orléans Cedex 02, France
  • 12Observatoire Radioastronomique de Nançay, Observatoire de Paris, Université PSL, Université d’Orléans, CNRS, 18330 Nançay, France
  • 13LUTH, Observatoire de Paris, PSL Research University, 92195 Meudon, France
  • 14Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom
  • 15OzGrav-Swinburne University of Technology, Victoria 3166, Australia

  • *ldonofrio@roma1.infn.it
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Phys. Rev. D 108, 122002 – Published 4 December, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.122002

Abstract

The 5n-vector ensemble method is a multiple test for the targeted search of continuous gravitational waves from an ensemble of known pulsars. This method can improve the detection probability by combining the results from individually undetectable pulsars if few signals are near the detection threshold. In this paper, we apply the 5n-vector ensemble method to the O3 dataset from the LIGO and Virgo detectors considering an ensemble of 201 known pulsars. We find no evidence for a signal from the ensemble and set a 95% credible upper limit on the mean ellipticity assuming a common exponential distribution for the pulsars’ ellipticities. Using two independent hierarchical Bayesian procedures, we find upper limits of 1.2×10−9 and 2.5×10−9 on the mean ellipticity for the 201 analyzed pulsars.

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Phys. Rev. D 108, 122002– Published 4 December, 2023
  • Received 21 January 2023
  • Accepted 13 November 2023
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