Tidal capture of an asteroid by a magnetar: FRB-like bursts, glitch and anti-glitch
arXiv:2305.17316 · doi:10.1093/mnras/stad1585
Abstract
Recently, remarkable anti-glitch and glitch accompanied by bright radio bursts of the Galactic magnetar SGR J1935+2154 were discovered. These two infrequent temporal coincidences between the glitch/anti-glitch and the fast radio burst (FRB)-like bursts reveal their physical connection of them. Here we propose that the anti-glitch/glitch and FRB-like bursts can be well understood by an asteroid tidally captured by a magnetar. In this model, an asteroid is tidally captured and disrupted by a magnetar. Then, the disrupted asteroid will transfer the angular momentum to the magnetar producing a sudden change in the magnetar rotational frequency at the magnetosphere radius. If the orbital angular momentum of the asteroid is parallel (or anti-parallel) to that of the spinning magnetar, a glitch (or anti-glitch) will occur. Subsequently, the bound asteroid materials fall back to the pericenter and eventually are accreted to the surface of the magnetar. Massive fragments of the asteroid cross magnetic field lines and produce bright radio bursts through coherent curvature radiation. Our model can explain the sudden magnetar spin changes and FRB-like bursts in a unified way.
6 pages, 1 figure, published by MNRAS https://doi.org/10.1093/mnras/stad1585
References in corpus (21)
- A fast radio burst associated with a Galactic magnetar
- A bright millisecond-duration radio burst from a Galactic magnetar
- Solar System evolution from compositional mapping of the asteroid belt
- INTEGRAL discovery of a burst with associated radio emission from the magnetar SGR 1935+2154
- Models of Pulsar Glitches
- A bimodal burst energy distribution of a repeating fast radio burst source
- HXMT Identification of a non-thermal X-ray burst from SGR J1935+2154 and with FRB 200428
- A peculiar hard X-ray counterpart of a Galactic fast radio burst
- Avalanche dynamics of radio pulsar glitches
- Repeating fast radio burst 20201124A originates from a magnetar/Be star binary
- The FRB 20121102A November rain in 2018 observed with the Arecibo Telescope
- Arecibo observations of a burst storm from FRB 20121102A in 2016
- On the Distance of SGR 1935+2154 Associated with FRB 200428 and Hosted in SNR G57.2+0.8
- Statistical properties magnetar bursts and FRB 121102
- A Magnetar-Asteroid Impact Model for FRB 200428 Associated with an X-ray Burst from SGR 1935+2154
- FRB 200428: an Impact between an Asteroid and a Magnetar
- Repeating fast radio bursts reveal memory from minutes to an hour
- Anti-glitches within the standard scenario of pulsar glitches
- Constraining mechanism associated with fast radio burst and glitch from SGR J1935
- Long-term statistics of pulsar glitches due to history-dependent avalanches
- A note on the anti-glitch of magnetar SGR 1935+2154