Braking index jumps in young pulsars

Abstract

The departure of all measured pulsar braking indexes from the "canonical" dipole value 3 has been attributed to several causes in the past. Careful monitoring of the Crab pulsar has revealed permanent changes in the spin-down rate which are most likely the accumulation of small jumps in the angle $\alpha$ between the magnetic and spin axis. Recently, a large permanent change in the braking index of the in the "Crab twin" pulsar B0540-69 has been reported, and an analogous phenomenon seen in the high-field pulsar PSR 1846-0258 has been seen following a glitch, while another similar event (in PSR J119-6127) needs to be confirmed. We argue in this work that a common physical origin of all these observations can be attributed to the counter-alignment of the axis without serious violations of the observed features and with very modest inferred values of the hypothesized jump in the $\alpha$ angle. In addition, detected increases of the X-ray luminosities after the events are an additional ingredient for this interpretation. We argue that a component of a time-dependent torque has been identified, being an important ingredient towards a full solution of observed pulsar timing behavior which is in search of a consistent modeling.

arXiv comment5 pages, no figures, to appear in MNRAS

References in corpus (21)

• Switched magnetospheric regulation of pulsar spin-down
• A periodically active pulsar giving insight into magnetospheric physics
• A study of 315 glitches in the rotation of 102 pulsars
• 45 Years of Rotation of the Crab Pulsar
• Magnetar-like Emission from the Young Pulsar in Kes 75
• The glitch-induced identity changes of PSR J1119-6127
• Pulsar braking and the P-Pdot diagram
• New long-term braking index measurements for glitching pulsars using a glitch-template method
• Thermally-driven Neutron Star Glitches
• Post-outburst Observations of the Magnetically Active Pulsar J1846-0258: a new braking index, increased timing noise, and radiative recovery
• The unusual glitch recoveries of the high magnetic field pulsar J1119$-$6127
• On the braking index of the unusual high-B rotation-powered pulsar PSR J1846-0258
• Long-term timing and emission behavior of the young Crab-like pulsar PSR B0540-69
• Starquake-induced Magnetic Field and Torque Evolution in Neutron Stars
• Are We Seeing Magnetic Axis Reorientation in the Crab and Vela Pulsars?
• A New, Low Braking Index For the LMC Pulsar B0540-69
• Discovery of a Spin-Down State Change in the LMC Pulsar B0540-69
• Glitches, torque evolution and the dynamics of young pulsars
• The evolution of the magnetic inclination angle as an explanation of the long term red timing-noise of pulsars
• The influence of quantum vacuum friction on pulsars
• On the new braking index of PSR B0540-69: further support for magnetic field growth of neutron stars following submergence by fallback accretion

Cited by in corpus (1)

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