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Rotational evolution of the Vela pulsar during the 2016 glitch


Ashton, G and Lasky, PD and Graber, V and Palfreyman, J, Rotational evolution of the Vela pulsar during the 2016 glitch, Nature Astronomy, 3, (12) pp. 1143-1148. ISSN 2397-3366 (2019) [Refereed Article]

DOI: doi:10.1038/s41550-019-0844-6


The 2016 Vela glitch observed by the Mount Pleasant radio telescope provides the first opportunity to study pulse-to-pulse dynamics of a pulsar glitch, opening up new possibilities to study the neutron starís interior. We fit models of the starís rotation frequency to the pulsar data, and present the following three results. First, we constrain the glitch rise time to less than 12.6 s with 90% confidence, almost three-times shorter than the previous best constraint. Second, we find definitive evidence for a rotational-frequency overshoot and fast relaxation following the glitch. Third, we find evidence for a slowdown of the star's rotation immediately before the glitch. The overshoot is predicted theoretically by some models; we discuss implications of the glitch rise and overshoot decay times on internal neutron-star physics. The slowdown preceding the glitch is unexpected; we propose the slowdown may trigger the glitch by causing a critical lag between crustal superfluid and the crust.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Palfreyman, J (Dr Jim Palfreyman)
ID Code:147437
Year Published:2019
Web of Science® Times Cited:32
Deposited By:Physics
Deposited On:2021-11-01
Last Modified:2021-11-01

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