Recycled pulsars with multipolar magnetospheres from accretion-induced magnetic burial
AG Suvorov, A Melatos
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | OXFORD UNIV PRESS | Published : 2020
Many millisecond pulsars are thought to be old neutron stars spun up ('recycled') during an earlier accretion phase. They typically have relatively weak (≲109 G) dipole field strengths, consistent with accretion-induced magnetic burial. Recent data from the Neutron Star Interior Composition Explorer indicate that hotspots atop the recycled pulsar PSR J0030-0451 are not antipodal, so that the magnetic field cannot be that of a centred dipole. In this paper it is shown that multipolarity is naturally expected in the burial scenario because of equatorial field line compression. Grad-Shafranov equilibria are constructed to show how magnetic multipole moments can be calculated in terms of various..View full abstract
Awarded by Australian Research Council through its Centre of Excellence program
We thankMaxim Priymak and Donald Payne for providing access to the Grad-Shafranov solver. We are grateful to the anonymous referee for providing helpful feedback. This work was supported by the Alexander von Humboldt Foundation and the Australian Research Council through its Centre of Excellence program (grant number CE170100004) and Discovery Project DP170103625.