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Searches for Gravitational Waves from Known Pulsars at Two Harmonics in the Second and Third LIGO-Virgo Observing Runs
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Searches for Gravitational Waves from Known Pulsars at Two Harmonics in the Second and Third LIGO-Virgo Observing Runs

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration, R Abbott, H Abe, F Acernese, K Ackley, N Adhikari, R. X Adhikari, V. K Adkins, …
arXiv.org
20/07/2022

摘要

Physics - General Relativity and Quantum Cosmology Physics - High Energy Astrophysical Phenomena
We present a targeted search for continuous gravitational waves (GWs) from 236 pulsars using data from the third observing run of LIGO and Virgo (O3) combined with data from the second observing run (O2). Searches were for emission from thel=m=2mass quadrupole mode with a frequency at only twice the pulsar rotation frequency (single harmonic) and thel=2, m=1,2modes with a frequency of both once and twice the rotation frequency (dual harmonic). No evidence of GWs was found so we present 95% credible upper limits on the strain amplitudesh₀for the single harmonic search along with limits on the pulsars' mass quadrupole momentsQ₂₂and ellipticitiesε . Of the pulsars studied, 23 have strain amplitudes that are lower than the limits calculated from their electromagnetically measured spin-down rates. These pulsars include the millisecond pulsars J04374715 and J07116830 which have spin-down ratios of 0.87 and 0.57 respectively. For nine pulsars, their spin-down limits have been surpassed for the first time. For the Crab and Vela pulsars our limits are factors of∼ 100and∼ 20more constraining than their spin-down limits, respectively. For the dual harmonic searches, new limits are placed on the strain amplitudesC₂₁andC₂₂ . For 23 pulsars we also present limits on the emission amplitude assuming dipole radiation as predicted by Brans-Dicke theory.

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