Using observed precession periods and surface temperatures, the authors constrain the internal fields of four magnetars and two FRB hosts, finding toroidal field strengths of order 10^15 G and a toroidal distribution parameter beta greater than or similar to 1.
Periodicity in fast radio bursts due to forced precession by a fallback disk
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abstract
Recently, a 16-day periodicity in one fast radio burst is reported. We propose that this 16-day periodicity may be due to forced precession of the neutron star by a fallback disk. When the rotation axis is misaligned with the normal direction of the disk plane, the neutron star will precess. The eccentricity of the neutron star may be due to rotation or strong magnetic field etc. We found that the 16-day period may be understood using typical masses of the fallback disk. Polarization observations and information about the neutron star rotation period may help to discriminate different models. The possible precession observations in pulsars, magnetars, and fast radio bursts may be understood together using forced precession by a fallback disk.
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Revealing the internal magnetic field configuration of magnetars via their associated periodic signals
Using observed precession periods and surface temperatures, the authors constrain the internal fields of four magnetars and two FRB hosts, finding toroidal field strengths of order 10^15 G and a toroidal distribution parameter beta greater than or similar to 1.