Gravitational signal propagation in the double pulsar studied with the MeerKAT telescope

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dc.contributor.authorHu, Huanchen
dc.contributor.authorKramer, Michael
dc.contributor.authorSerylak, MacIej
dc.date.accessioned2023-01-11T09:10:11Z
dc.date.available2023-01-11T09:10:11Z
dc.date.issued2022
dc.description.abstractThe double pulsar PSR J0737−3039A/B has offered a wealth of gravitational experiments in the strong-field regime, all of which general relativity has passed with flying colours. In particular, among current gravity experiments that test photon propagation, the double pulsar probes the strongest spacetime curvature. Observations with MeerKAT and, in the future, the Square Kilometre Array (SKA) can greatly improve the accuracy of current tests and facilitate tests of next-to-leading-order (NLO) contributions in both orbital motion and signal propagation. We present our timing analysis of new observations of PSR J0737−3039A, made using the MeerKAT telescope over the last three years. The increased timing precision offered by MeerKAT yields a measurement of Shapiro delay parameter s that it twice as good, and an improved mass measurements compared to previous studies. In addition, our results provide an independent confirmation of the NLO signal propagation effects and already surpass the previous measurement from 16 yr data by a factor of 1.65. These effects include the retardation effect due to the movement of the companion and the deflection of the signal by the gravitational field of the companion. We also investigate the novel effects that have been expected. For instance, we search for potential profile variations near superior conjunctions caused by shifts of the line of sight due to latitudinal signal deflection, and we find insignificant evidence with our current data. With simulations, we find that the latitudinal deflection delay is unlikely to be measured with timing because of its correlation with Shapiro delay. Furthermore, although it is currently not possible to detect the expected lensing correction to the Shapiro delay, our simulations suggest that this effect may be measured with the full SKA. Finally, we provide an improved analytical description for the signal propagation in the double pulsar system that meets the timing precision expected from future instruments such as the full SKA.en_US
dc.identifier.citationHu, H. et al. (2022). Gravitational signal propagation in the double pulsar studied with the MeerKAT telescope. Astronomy and Astrophysics, 667, A149. 10.1051/0004-6361/202244825en_US
dc.identifier.uri2329-1265
dc.identifier.uri10.1051/0004-6361/202244825
dc.identifier.urihttp://hdl.handle.net/10566/8269
dc.language.isoenen_US
dc.publisherHans Publishersen_US
dc.subjectNeutronen_US
dc.subjectPhysicsen_US
dc.subjectAstronomyen_US
dc.subjectGravitationen_US
dc.subjectTelescopesen_US
dc.titleGravitational signal propagation in the double pulsar studied with the MeerKAT telescopeen_US
dc.typeArticleen_US

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