On the Origin of Pulsar and Magnetar Magnetic Fields

White, Christopher J.; Burrows, Adam; Coleman, Matthew S. B.; Vartanyan, David

doi:10.3847/1538-4357/ac4507

On the Origin of Pulsar and Magnetar Magnetic Fields

Journal Article · Thu Feb 17 00:00:00 EST 2022 · The Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/ac4507· OSTI ID:1845596

White, Christopher J.; ; ;

Abstract

In order to address the generation of neutron star magnetic fields, with particular focus on the dichotomy between magnetars and radio pulsars, we consider the properties of dynamos as inferred from other astrophysical systems. With sufficiently low (modified) Rossby number, convective dynamos are known to produce dipole-dominated fields whose strength scales with convective flux, and we argue that these expectations should apply to the convective protoneutron stars (PNSs) at the centers of core-collapse supernovae. We analyze a suite of three-dimensional simulations of core collapse, featuring a realistic equation of state and full neutrino transport, in this context. All our progenitor models, ranging from 9 M _⊙ to 25 M _⊙ , including one with initial rotation, have sufficiently vigorous PNS convection to generate dipole fields of order ∼10 ¹⁵ Gauss, if the modified Rossby number resides in the critical range. Thus, the magnetar/radio pulsar dichotomy may arise naturally in part from the distribution of core rotation rates in massive stars.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of California, Oakland, CA (United States); Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-06CH11357; AC03-76SF00098; SC0018297

OSTI ID:: 1845596

Alternate ID(s):: OSTI ID: 1981248

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 926; ISSN 0004-637X

Publisher:: American Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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79 ASTRONOMY AND ASTROPHYSICS
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On the Origin of Pulsar and Magnetar Magnetic Fields

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