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Gravitational radiation from neutron stars deformed by crustal Hall drift

Suvorov, A.G. and Mastrano, A. and Geppert, Ulrich (2016) Gravitational radiation from neutron stars deformed by crustal Hall drift. Monthly Notices of the Royal Astronomical Society, 459 (3), pp. 3407-3418. Oxford University Press. DOI: 10.1093/mnras/stw909 ISSN 0035-8711

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Official URL: http://cdsads.u-strasbg.fr/abs/2016arXiv160404305S

Abstract

Aprecondition for the radio emission of pulsars is the existence of strong, small-scalemagnetic field structures (‘magnetic spots’) in the polar cap region. Their creation can proceed via crustal Hall drift out of two qualitatively and quantitatively different initial magnetic field configurations: a field confined completely to the crust and another which penetrates the whole star. The aim of this study is to explore whether these magnetic structures in the crust can deform the star sufficiently to make it an observable source of gravitational waves. We model the evolution of these field configurations, which can develop, within ∼104–105 yr, magnetic spotswith local surface field strengths∼1014 Gmaintained over�106 yr. Deformations caused by the magnetic forces are calculated.We show that, under favourable initial conditions, a star undergoing crustal Hall drift can have ellipticity � ∼ 10−6, even with sub-magnetar polar field strengths, after ∼105 yr. A pulsar rotating at ∼102 Hz with such � is a promising gravitational wave source candidate. Since such large deformations can be caused only by a particular magnetic field configuration that penetrates the whole star and whose maximum magnetic energy is concentrated in the outer core region, gravitational wave emission observed from radio pulsars can thus inform us about the internal field structures of young neutron stars.

Item URL in elib:https://elib.dlr.de/104438/
Document Type:Article
Title:Gravitational radiation from neutron stars deformed by crustal Hall drift
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Suvorov, A.G.1School of Physics, University of Melbourne, Parkville, VIC 3010, AustraliaUNSPECIFIED
Mastrano, A.1School of Physics, University of Melbourne, Parkville, VIC 3010, AustraliaUNSPECIFIED
Geppert, UlrichUlrich.Geppert (at) dlr.deUNSPECIFIED
Date:April 2016
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:459
DOI :10.1093/mnras/stw909
Page Range:pp. 3407-3418
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:gravitational waves – stars: magnetic field – stars: neutron – pulsars: general
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben Systemkonditionierung, Systemkonditionierung
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Mechanic and Thermal Systems
Deposited By: Geppert, Prof. Dr.rer.nat. habil. Ulrich
Deposited On:31 May 2016 12:02
Last Modified:06 Sep 2019 15:17

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