Timing and noise analysis of five millisecond pulsars observed with MeerKAT

dc.contributor.authorAndrianomena, Sambatra
dc.contributor.authorGeyer, Marisa
dc.contributor.authorEnwelum, U
dc.date.accessioned2025-05-27T07:27:12Z
dc.date.available2025-05-27T07:27:12Z
dc.date.issued2025
dc.description.abstractMillisecond pulsars (MSPs) in binary systems are precise laboratories for tests of gravity and the physics of dense matter. Their orbits can show relativistic effects that provide a measurement of the neutron star mass and the pulsars are included in timing array experiments that search for gravitational waves. Neutron star mass measurements are key to eventually solving the neutron star equation of state and these can be obtained by a measure of the Shapiro delay if the orbit is viewed near edge-on. Here, we report on the timing and noise analysis of five MSPs observed with the MeerKAT radio telescope: PSRs J0900–3144, J0921–5202, J1216–6410, J1327–0755, and J1543–5149. We searched for the Shapiro delay in all of the pulsars and obtain weak detections for PSRs J0900–3144, J1216–6410, and J1327–0755. We report a higher significance detection of the Shapiro delay for PSR J1543–5149, giving a precise pulsar mass of Mp = 1.349+0.043-0.061M☉ and companion white-dwarf mass Mc = 0.223+0.005-0.007M☉. This is an atypically low-mass measurement for a recycled MSP. In addition to these Shapiro delays, we also obtain timing model parameters including proper motions and parallax constraints for most of the pulsars.
dc.identifier.citationChisabi, M., Andrianomena, S., Enwelum, U., Gasennelwe, E.G., Idris, A., Idogbe, E.A., Shilunga, S., Geyer, M., Reardon, D.J., Okany, C.F. and Shamohammadi, M., 2025. Timing and noise analysis of five millisecond pulsars observed with MeerKAT. Monthly Notices of the Royal Astronomical Society, 537(3), pp.2462-2470.
dc.identifier.urihttps://doi.org/10.1093/mnras/staf100
dc.identifier.urihttps://hdl.handle.net/10566/20447
dc.language.isoen
dc.publisherOxford University Press
dc.subjectAstrometry
dc.subjectParallaxes
dc.subjectNeutron star
dc.subjectPulsars
dc.subjectMeerKAT
dc.titleTiming and noise analysis of five millisecond pulsars observed with MeerKAT
dc.typeArticle

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