Ultra-wideband polarimetry of the April 2021 profile change event in PSR J1713+0747

Abstract The millisecond pulsar PSR J1713 $+$ 0747 is a high-priority target for pulsar timing array experiments due to its long-term timing stability, and bright, narrow pulse profile. In April 2021, PSR J1713 $+$ 0747 underwent a significant profile change event, observed by several telescopes worldwide. Using the broad bandwidth and polarimetric fidelity of the Ultra-Wideband Low-frequency receiver on Murriyang, CSIRO’s Parkes radio telescope, we investigated the long-term spectro-polarimetric behaviour of this profile change in detail. We highlight the broad-bandwidth nature of the event, which exhibits frequency dependence that is inconsistent with cold-plasma propagation effects. We also find that spectral and temporal variations are stronger in one of the orthogonal polarisation modes than the other and observe mild variations ( $\sim 3$ – $5\,\sigma$ significance) in circular polarisation above 1 400 MHz following the event. However, the linear polarisation position angle remained remarkably stable in the profile leading edge throughout the event. With over three years of data post-event, we find that the profile has not yet recovered back to its original state, indicating a long-term asymptotic recovery, or a potential reconfiguration of the pulsar’s magnetic field. These findings favour a magnetospheric origin of the profile change event over a line-of-sight propagation effect in the interstellar medium.

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Journal
Publications of the Astronomical Society of Australia
Published
2025-01-01
DOI
https://doi.org/10.1017/pasa.2025.10099
Citations
1
Primary Topic
Pulsars and Gravitational Waves Research
Type
article
Field-Weighted Citation Impact
1.15

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Ultra-wideband polarimetry of the April 2021 profile change event in PSR J1713+0747

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Publications of the Astronomical Society of Australia
Pulsars and Gravitational Waves Research
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article

Ultra-wideband polarimetry of the April 2021 profile change event in PSR J1713+0747

Saurav Mishra, R. M. Shannon, Daniel J. Reardon, Craig Russell, Valentina Di Marco, X. J. Zhu, J. R. Dawson, Vivek Gupta, Matthew T. Kerr, Rami Mandow, Shi Dai, G. Hobbs, Andrew Zic, Agastya Kapur, M. E. Lower, M. Curyło, Lei Zhang, Shuangqiang Wang
article en
1 citations

Abstract

Abstract The millisecond pulsar PSR J1713 $+$ 0747 is a high-priority target for pulsar timing array experiments due to its long-term timing stability, and bright, narrow pulse profile. In April 2021, PSR J1713 $+$ 0747 underwent a significant profile change event, observed by several telescopes worldwide. Using the broad bandwidth and polarimetric fidelity of the Ultra-Wideband Low-frequency receiver on Murriyang, CSIRO’s Parkes radio telescope, we investigated the long-term spectro-polarimetric behaviour of this profile change in detail. We highlight the broad-bandwidth nature of the event, which exhibits frequency dependence that is inconsistent with cold-plasma propagation effects. We also find that spectral and temporal variations are stronger in one of the orthogonal polarisation modes than the other and observe mild variations ( $\sim 3$ – $5\,\sigma$ significance) in circular polarisation above 1 400 MHz following the event. However, the linear polarisation position angle remained remarkably stable in the profile leading edge throughout the event. With over three years of data post-event, we find that the profile has not yet recovered back to its original state, indicating a long-term asymptotic recovery, or a potential reconfiguration of the pulsar’s magnetic field. These findings favour a magnetospheric origin of the profile change event over a line-of-sight propagation effect in the interstellar medium.

Publications of the Astronomical Society of AustraliaVol. 42
United States Naval Research Laboratory (US), Commonwealth Scientific and Industrial Research Organisation (AU), Australia Telescope National Facility (AU), Chinese Academy of Sciences (CN), Beijing Normal University (CN), Xinjiang Astronomical Observatory (CN), Australian Regenerative Medicine Institute (AU), ARC Centre of Excellence for Gravitational Wave Discovery (AU), National Astronomical Observatories (CN), Data61 (AU), Monash University (AU), Swinburne University of Technology (AU), Macquarie University (AU)
National Aeronautics and Space Administration, Australian Government, Commonwealth Scientific and Industrial Research Organisation
Openalex Percentile: Top 16%
Pulsars and Gravitational Waves Research
1.15
DOIOpen Access PDFOpenAlex
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