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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Magnetic field decay in black widow pulsars

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Author(s):
Mendes, Camile [1] ; de Avellar, Marcio G. B. [1] ; Horvath, J. E. [1] ; de Souza, Rodrigo A. [1] ; Benvenuto, O. G. [2, 3] ; De Vito, M. A. [2, 3]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226, BR-05508090 Sao Paulo - Brazil
[2] UNLP, CONICET, CCT, IALP, B1900FWA, La Plata, Buenos Aires - Argentina
[3] UNLP, Fac Ciencias Astron & Geofis, Paseo Bosque S-N, B1900FWA, La Plata, Buenos Aires - Argentina
Total Affiliations: 3
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 475, n. 2, p. 2178-2184, APR 2018.
Web of Science Citations: 0
Abstract

We study in this work the evolution of the magnetic field in `redback-black widow' pulsars. Evolutionary calculations of these `spider' systems suggest that first the accretion operates in the redback stage, and later the companion star ablates matter due to winds from the recycled pulsar. It is generally believed that mass accretion by the pulsar results in a rapid decay of the magnetic field when compared to the rate of an isolated neutron star. We study the evolution of the magnetic field in black widow pulsars by solving numerically the induction equation using the modified Crank-Nicolson method with intermittent episodes of mass accretion on to the neutron star. Our results show that the magnetic field does not fall below a minimum value ('bottom field') in spite of the long evolution time of the black widow systems, extending the previous conclusions for much younger low-mass X-ray binary systems. We find that in this scenario, the magnetic field decay is dominated by the accretion rate, and that the existence of a bottom field is likely related to the fact that the surface temperature of the pulsar does not decay as predicted by the current cooling models. We also observe that the impurity of the pulsar crust is not a dominant factor in the decay of magnetic field for the long evolution time of black widow systems. (AU)

FAPESP's process: 15/20553-0 - Modelling the quasi-periodic oscillations and their respective time lags in neutron star low-mass X-ray binaries - the NS-LMXB 4U 1636-53 as a case study
Grantee:Marcio Guilherme Bronzato de Avellar
Support type: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 11/23996-9 - Compact stars in binaries: investigating the composition of superdense matter
Grantee:Marcio Guilherme Bronzato de Avellar
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/26258-4 - Superdense matter in the universe
Grantee:Manuel Máximo Bastos Malheiro de Oliveira
Support type: Research Projects - Thematic Grants