Pulsar braking: magnetodipole vs. wind

Abstract

Pulsars are good clocks in the universe. One fundamental question is that why they are good clocks? This is related to the braking mechanism of pulsars. Nowadays pulsar timing is done with unprecedented accuracy. More pulsars have braking indices measured. The period derivative of intermittent pulsars and magnetars can vary by a factor of several. However, during pulsar studies, the magnetic dipole braking in vacuum is still often assumed. It is shown that the fundamental assumption of magnetic dipole braking (vacuum condition) does not exist and it is not consistent with the observations. The physical torque must consider the presence of the pulsar magnetosphere. Among various efforts, the wind braking model can explain many observations of pulsars and magnetars in a unified way. It is also consistent with the up-to-date observations. It is time for a paradigm shift in pulsar studies: from magnetic dipole braking to wind braking. As one alternative to the magnetospheric model, the fallback disk model is also discussed.

12 pages, invited review, published in "Science China: Physics, Mechanics & Astronomy"

References in corpus (21)

• The strongest cosmic magnets: Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars
• Switched magnetospheric regulation of pulsar spin-down
• A periodically active pulsar giving insight into magnetospheric physics
• Transient pulsed radio emission from a magnetar
• A Debris Disk Around An Isolated Young Neutron Star
• Untwisting magnetospheres of neutron stars
• 45 Years of Rotation of the Crab Pulsar
• Supernova remnant energetics and magnetars: no evidence in favour of millisecond proto-neutron stars
• The Prelude to and Aftermath of the Giant Flare of 2004 December 27: Persistent and Pulsed X-ray Properties of SGR 1806-20 from 1993 to 2005
• The magnetar 1E 1547.0-5408: radio spectrum, polarimetry, and timing
• Radio emission evolution, polarimetry and multifrequency single pulse analysis of the radio magnetar PSR J1622-4950
• Radio and X-ray observations of the intermittent pulsar J1832+0029
• Timing and Flux Evolution of the Galactic Center Magnetar SGR J1745-2900
• Rotational evolution of the Crab pulsar in the wind braking model
• The X-ray outburst of the Galactic Centre magnetar SGR J1745-2900 during the first 1.5 year
• Repeated, Delayed Torque Variations Following X-ray Flux Enhancements in the Magnetar 1E1048.1$-$5937
• AXPs/SGRs: Magnetars or Quark-stars?
• Long-term Observations of Three Nulling Pulsars
• Recent glitches detected in the Crab pulsar
• What can the braking indices tell us about pulsars' nature?
• To differentiate neutron star models by X-ray polarimetry

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• Fluctuating neutron star magnetosphere: braking indices of eight pulsars, frequency second derivatives of 222 pulsars and 15 magnetars
• Modelling spin evolution of magnetars
• Discussions on the nature of GLEAM-X J162759.5-523504.3
• Evolution of Spin Period and Magnetic Field of the Crab Pulsar: Decay of the Braking Index by the Particle Wind Flow Torque
• Strong Matter: Rethinking Philosophically
• Supernova Neutrino in a Strangeon Star Model
• A new approach to the GeV flare of PSR B1259-63/LS2883
• The optical/UV excess of X-ray-dim isolated neutron star II. nonuniformity of plasma on strangeon star surface
• The role of equation of state on the spin-up of millisecond pulsars
• Ultraluminous X-ray pulsar: accreting magnetar?