News and views regarding PSR J1757-1854, a highly-relativistic binary pulsar

Cameron, A. D.; Bailes, M.; Balakrishnan, V.; Champion, D. J.; Freire, P. C. C.; Kramer, M.; Wex, N.; Johnston, S.; Lyne, A. G.; Stappers, B. W.; McLaughlin, M. A.; Pol, N.; Wahl, H.; Ng, C.; Possenti, A.; Ridolfi, A.

doi:10.48550/arxiv.2203.15995

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…The first test of general relativity via the indirect detection of gravitational waves was done by the first discovered binary pulsar PSR B1913+16, which is a double neutron star system (Hulse & Taylor 1975). Afterward, strong field tests of gravity were followed using the timing data of this and other double neutron star systems (Weisberg & Huang 2016;Kramer et al 2021;Cameron et al 2022). In some cases, tests of gravity theory were possible for pulsar−white dwarf binaries too (Freire et al 2012;Antoniadis et al 2013;Ding et al 2020;Cromartie et al 2020).…”

Section: Introductionmentioning

confidence: 99%

A study of the light bending phenomenon under full general relativity for a pulsar in a binary with a Schwarzschild black hole

Jyotijwal

Bagchi

Basu

2023

Monthly Notices of the Royal Astronomical Society

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The values of the bending delays in the signal of a radio pulsar in a binary with a stellar mass black hole as a companion have been calculated accurately within a full general relativistic framework considering the Schwarzchid spacetime near the companion. The results match with the pre-existing approximate analytical expressions unless both of the orbital inclination angle and the orbital phase are close to 90○. For such a case, the approximate analytical expressions underestimate the value of the bending delay. On the other hand, for systems like the double pulsar, those expressions are valid throughout the orbital phase, unless its inclination angle is very close to 90○. For a pulsar−black hole binary, the bending phenomenon also increases the strength of the pulse profile and sometimes can lead to a small low intensity tail.

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Section: Introductionmentioning

confidence: 99%

A study of the light bending phenomenon under full general relativity for a pulsar in a binary with a Schwarzschild black hole

Jyotijwal

Bagchi

Basu

2023

Monthly Notices of the Royal Astronomical Society

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Improving pulsar-timing solutions through dynamic pulse fitting

Nathan

Miles

Ashton

et al. 2023

Monthly Notices of the Royal Astronomical Society

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Precision pulsar timing is integral to the detection of the nanohertz stochastic gravitational-wave background as well as understanding the physics of neutron stars. Conventional pulsar timing often uses fixed time and frequency-averaged templates to determine the pulse times of arrival, which can lead to reduced accuracy when the pulse profile evolves over time. We illustrate a dynamic timing method that fits each observing epoch using basis functions. By fitting each epoch separately, we allow for the evolution of the pulse shape epoch to epoch. We apply our method to PSR J1103−5403 and find evidence that it undergoes mode changing, making it the fourth millisecond pulsar to exhibit such behaviour. Our method, which is able to identify and time a single mode, yields a timing solution with a root-mean-square error of 1.343μs, a factor of 1.78 improvement over template fitting on both modes. In addition, the white-noise amplitude is reduced 4.3 times, suggesting that fitting the full data set causes the mode changing to be incorrectly classified as white noise. This reduction in white noise boosts the signal-to-noise ratio of a gravitational-wave background signal for this particular pulsar by 32 %. We discuss the possible applications for this method of timing to study pulsar magnetospheres and further improve the sensitivity of searches for nanohertz gravitational waves.

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News and views regarding PSR J1757-1854, a highly-relativistic binary pulsar

Cited by 2 publications

References 6 publications

A study of the light bending phenomenon under full general relativity for a pulsar in a binary with a Schwarzschild black hole

A study of the light bending phenomenon under full general relativity for a pulsar in a binary with a Schwarzschild black hole

Improving pulsar-timing solutions through dynamic pulse fitting

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