PSR J0537-6910: Exponential recoveries detected for 12 glitches

Abstract

Pulsar glitches are unresolved increments of the rotation rate that sometimes trigger an enhancement of the spin-down rate. On occasions, the augmented spin-down decays gradually in an exponential manner, particularly after the largest glitch events. The young pulsar PSR J0537-6910 exhibits the highest known glitching rate, with 60 events detected in nearly 18 years of monitoring. Despite most PSR J0537-6910 glitches being large, only one exponential recovery has been reported, following its first discovered glitch. This is puzzling, as pulsars of similar characteristics typically present significant exponential recoveries. We aim to determine whether this reflects an intrinsic difference in PSR J0537-6910 or a detectability issue, for example due to its high glitch frequency. The full dataset, including recent NICER observations, was systematically searched for exponential relaxations. Each glitch was tested for evidence of a recovery over a broad range of trial timescales. Promising candidates were investigated further by comparing recovery models with and without an exponential term using Bayesian evidence. We discovered six new glitches, bringing the total to 66. Our criteria strongly indicates the presence of 11 previously undetected exponential recoveries. We presente updated glitch and timing solutions. Exponential recoveries are detected only for the largest glitches, though not all of them. The inferred timescales range from 4 to 37 d, with the decaying frequency increment generally below $1\%$ of the total. We find that $\ddot{\nu }$ can remain stable across several glitches, with persistent changes associated with only some events. In particular, it tends to be lowest after glitches with exponential recoveries, yielding inter-glitch braking indices between 6 and 9. Following glitches without recoveries, $\ddot{\nu }$ is higher, leading to braking indices between 10 and 35.

References in corpus (19)

• TEMPO2, a new pulsar timing package. I: Overview
• Models of Pulsar Glitches
• 45 Years of Rotation of the Crab Pulsar
• Detection of 107 glitches in 36 southern pulsars
• PINT: A Modern Software Package for Pulsar Timing
• Predicting the Starquakes in PSR J0537-6910
• New long-term braking index measurements for glitching pulsars using a glitch-template method
• Pulsar spin-down: the glitch-dominated rotation of PSR J0537-6910
• The soft gamma-ray pulsar population: an high-energy overview
• The impact of glitches on young pulsar rotational evolution
• Diving below the spin-down limit: Constraints on gravitational waves from the energetic young pulsar PSR J0537-6910
• Return of the Big Glitcher: NICER timing and glitches of PSR J0537-6910
• The glitches and rotational history of the highly energetic young pulsar PSR J0537$-$6910
• Turbulent, pinned superfluids in neutron stars and pulsar glitch recoveries
• Timing six energetic rotation-powered X-ray pulsars, including the fast-spinning young PSR J0058-7218 and Big Glitcher PSR J0537-6910
• First results of the glitching pulsars monitoring program at the Argentine Institute of Radioastronomy
• Glitch-induced pulse profile change of PSR J0742-2822 observed from the IAR
• Measuring glitch recoveries and braking indices with Bayesian model selection
• Study of the 2024 major Vela glitch at the Argentine Institute of Radioastronomy

Cited by in corpus (1)

• Braking index of the frequently glitching PSR J0537$-$6910