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Coupled axisymmetric pulsar magnetospheres

Gourgouliatos, Konstantinos N.; Lynden-Bell, Donald

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Authors

Konstantinos N. Gourgouliatos

Donald Lynden-Bell



Abstract

We present solutions of force-free pulsar magnetospheres coupled with a uniform external magnetic field aligned with the dipole magnetic moment of the pulsar. The inclusion of the uniform magnetic field has the following consequences: the equatorial current sheet is truncated to a finite length, the fraction of field lines that are open increases, and the open field lines are confined within a cylindrical surface instead of becoming radial. A strong external magnetic field antiparallel to the dipole allows for solutions where the pulsar magnetic field is fully enclosed within an ellipsoidal surface. Configurations of fully enclosed or confined magnetospheres may appear in a double neutron star (DNS) where one of the components is a slowly rotating, strongly magnetized pulsar and the other a weakly magnetized millisecond pulsar. Depending on the geometry, twisted field lines from the millisecond pulsar could form an asymmetric wind. More dramatic consequences could appear closer to merger: there, the neutron star with the weaker magnetic field may undergo a stage where it alternates between an open and a fully enclosed magnetosphere releasing up 1037 erg. Under favourable combinations of magnetic fields DNSs can spend up to 103 yr in the coupled phase, implying a Galactic population of 0.02 systems. Potential observational signatures of this interaction are discussed including the possibility of powering recurring fast radio bursts. We also note that the magnetic interaction cannot have any significant effect on the spin evolution of the two pulsars.

Citation

Gourgouliatos, K. N., & Lynden-Bell, D. (2018). Coupled axisymmetric pulsar magnetospheres. Monthly Notices of the Royal Astronomical Society, 482(2), 1942-1954. https://doi.org/10.1093/mnras/sty2766

Journal Article Type Article
Acceptance Date Oct 3, 2018
Online Publication Date Oct 12, 2018
Publication Date Oct 12, 2018
Deposit Date Dec 3, 2018
Publicly Available Date Mar 29, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 482
Issue 2
Pages 1942-1954
DOI https://doi.org/10.1093/mnras/sty2766

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.




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