Vortex unpinning due to crustquake initiated neutron excitation and pulsar glitches

Abstract

Pulsars undergoing crustquake release strain energy, which can be absorbed in a small region inside the inner crust of the star and excite the free superfluid neutrons therein. The scattering of these neutrons with the surrounding pinned vortices may unpin a large number of vortices and effectively reduce the pinning force on vortex lines. Such unpinning by neutron scattering can produce glitches for Crab like pulsars and Vela pulsar of size in the range $\sim 10^{-8}-10^{-7}$, and $\sim 10^{-9}-10^{-8}$, respectively. Although we discuss here the crustquake initiated excitation, the proposal is very generic and equally applicable for any other sources, which can excite the free superfluid neutrons, or can be responsible for superfluid - normal phase transition of neutron superfluid in the inner crust of a pulsar.

9 pages, 1 figure, accepted for publication in Monthly notices of Royal Astronomical Society (MNRAS)

References in corpus (16)

• The Breaking Strain of Neutron Star Crust and Gravitational Waves
• Models of Pulsar Glitches
• Avalanche dynamics of radio pulsar glitches
• Mountains on Neutron Stars: Accreted vs. Non-Accreted crusts
• Pulsar Glitches: The Crust may be Enough
• Einstein@Home all-sky search for periodic gravitational waves in LIGO S5 data
• Magnetically-driven crustquakes in neutron stars
• Detecting gravitational waves from mountains on neutron stars in the Advanced Detector Era
• Unpinning triggers for superfluid vortex avalanches
• Magnetar superconductivity versus magnetism: neutrino cooling processes
• Developing a model for neutron star oscillations following starquakes
• The 2016 Vela glitch: a key to neutron star internal structure and dynamics
• Minimum Glitch of the Crab Pulsar and the Crustquake as a Trigger Mechanism
• The permanent ellipticity of the neutron star in PSR J1023+0038
• Observed glitches in 8 young pulsars
• Effects of Phase Transition induced density fluctuations on pulsar dynamics

Cited by in corpus (6)

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• Constraining mechanism associated with fast radio burst and glitch from SGR J1935
• Neutron star crust in Voigt approximation: general symmetry of the stress-strain tensor and an universal estimate for the effective shear modulus
• Glitches due to (quasi) neutron-vortex scattering in the superfluid inner crust of a pulsar
• Nuclear pasta structures at high temperatures
• Pulsar as a Weber detector of gravitational waves and a probe to its internal phase transitions