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- https://iopscience.iop.org/article/10.3847/1538-4357/ab20cb
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Research output: Contribution to journal › Journal article

Published

**Searches for Gravitational Waves from Known Pulsars at Two Harmonics in 2015-2017 LIGO Data.** / LIGO Scientific Collaboration and Virgo Collaboration.

Research output: Contribution to journal › Journal article

LIGO Scientific Collaboration and Virgo Collaboration 2019, 'Searches for Gravitational Waves from Known Pulsars at Two Harmonics in 2015-2017 LIGO Data', *The Astrophysical Journal*, vol. 879, 10. https://doi.org/10.3847/1538-4357/ab20cb

LIGO Scientific Collaboration and Virgo Collaboration (2019). Searches for Gravitational Waves from Known Pulsars at Two Harmonics in 2015-2017 LIGO Data. *The Astrophysical Journal*, *879*, [10]. https://doi.org/10.3847/1538-4357/ab20cb

LIGO Scientific Collaboration and Virgo Collaboration. Searches for Gravitational Waves from Known Pulsars at Two Harmonics in 2015-2017 LIGO Data. The Astrophysical Journal. 2019 Jul 1;879. 10. https://doi.org/10.3847/1538-4357/ab20cb

@article{63aaa3dedf5b4812b3ecb12d62e6684c,

title = "Searches for Gravitational Waves from Known Pulsars at Two Harmonics in 2015-2017 LIGO Data",

abstract = "We present a search for gravitational waves from 222 pulsars with rotation frequencies gsim10 Hz. We use advanced LIGO data from its first and second observing runs spanning 2015–2017, which provides the highest-sensitivity gravitational-wave data so far obtained. In this search we target emission from both the l = m = 2 mass quadrupole mode, with a frequency at twice that of the pulsar's rotation, and the l = 2, m = 1 mode, with a frequency at the pulsar rotation frequency. The search finds no evidence for gravitational-wave emission from any pulsar at either frequency. For the l = m = 2 mode search, we provide updated upper limits on the gravitational-wave amplitude, mass quadrupole moment, and fiducial ellipticity for 167 pulsars, and the first such limits for a further 55. For 20 young pulsars these results give limits that are below those inferred from the pulsars' spin-down. For the Crab and Vela pulsars our results constrain gravitational-wave emission to account for less than 0.017{\%} and 0.18{\%} of the spin-down luminosity, respectively. For the recycled millisecond pulsar J0711−6830 our limits are only a factor of 1.3 above the spin-down limit, assuming the canonical value of 1038 kg m2 for the star's moment of inertia, and imply a gravitational-wave-derived upper limit on the star's ellipticity of 1.2 × 10−8. We also place new limits on the emission amplitude at the rotation frequency of the pulsars.",

keywords = "gravitational waves, pulsars: general, stars: neutron",

author = "{LIGO Scientific Collaboration and Virgo Collaboration} and M. Pitkin",

year = "2019",

month = "7",

day = "1",

doi = "10.3847/1538-4357/ab20cb",

language = "English",

volume = "879",

journal = "The Astrophysical Journal",

issn = "0004-637X",

publisher = "Institute of Physics Publishing",

}

TY - JOUR

T1 - Searches for Gravitational Waves from Known Pulsars at Two Harmonics in 2015-2017 LIGO Data

AU - LIGO Scientific Collaboration and Virgo Collaboration

AU - Pitkin, M.

PY - 2019/7/1

Y1 - 2019/7/1

N2 - We present a search for gravitational waves from 222 pulsars with rotation frequencies gsim10 Hz. We use advanced LIGO data from its first and second observing runs spanning 2015–2017, which provides the highest-sensitivity gravitational-wave data so far obtained. In this search we target emission from both the l = m = 2 mass quadrupole mode, with a frequency at twice that of the pulsar's rotation, and the l = 2, m = 1 mode, with a frequency at the pulsar rotation frequency. The search finds no evidence for gravitational-wave emission from any pulsar at either frequency. For the l = m = 2 mode search, we provide updated upper limits on the gravitational-wave amplitude, mass quadrupole moment, and fiducial ellipticity for 167 pulsars, and the first such limits for a further 55. For 20 young pulsars these results give limits that are below those inferred from the pulsars' spin-down. For the Crab and Vela pulsars our results constrain gravitational-wave emission to account for less than 0.017% and 0.18% of the spin-down luminosity, respectively. For the recycled millisecond pulsar J0711−6830 our limits are only a factor of 1.3 above the spin-down limit, assuming the canonical value of 1038 kg m2 for the star's moment of inertia, and imply a gravitational-wave-derived upper limit on the star's ellipticity of 1.2 × 10−8. We also place new limits on the emission amplitude at the rotation frequency of the pulsars.

AB - We present a search for gravitational waves from 222 pulsars with rotation frequencies gsim10 Hz. We use advanced LIGO data from its first and second observing runs spanning 2015–2017, which provides the highest-sensitivity gravitational-wave data so far obtained. In this search we target emission from both the l = m = 2 mass quadrupole mode, with a frequency at twice that of the pulsar's rotation, and the l = 2, m = 1 mode, with a frequency at the pulsar rotation frequency. The search finds no evidence for gravitational-wave emission from any pulsar at either frequency. For the l = m = 2 mode search, we provide updated upper limits on the gravitational-wave amplitude, mass quadrupole moment, and fiducial ellipticity for 167 pulsars, and the first such limits for a further 55. For 20 young pulsars these results give limits that are below those inferred from the pulsars' spin-down. For the Crab and Vela pulsars our results constrain gravitational-wave emission to account for less than 0.017% and 0.18% of the spin-down luminosity, respectively. For the recycled millisecond pulsar J0711−6830 our limits are only a factor of 1.3 above the spin-down limit, assuming the canonical value of 1038 kg m2 for the star's moment of inertia, and imply a gravitational-wave-derived upper limit on the star's ellipticity of 1.2 × 10−8. We also place new limits on the emission amplitude at the rotation frequency of the pulsars.

KW - gravitational waves

KW - pulsars: general

KW - stars: neutron

U2 - 10.3847/1538-4357/ab20cb

DO - 10.3847/1538-4357/ab20cb

M3 - Journal article

VL - 879

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

M1 - 10

ER -