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          Institute: MPI für Gravitationsphysik     Collection: Astrophysical Relativity     Display Documents



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ID: 442864.0, MPI für Gravitationsphysik / Astrophysical Relativity
An Unstable Superfluid Stewartson Layer in a Differentially Rotating Neutron Star
Authors:Peralta, Carlos; Melatos, A.
Date of Publication (YYYY-MM-DD):2009-08-20
Title of Journal:Astrophysical Journal Letters
Volume:701
Issue / Number:2
Start Page:L75
End Page:L78
Review Status:not specified
Audience:Not Specified
Abstract / Description:Experimental and numerical evidence is reviewed for the existence of a Stewartson layer in spherical Couette flow at small Ekman and Rossby numbers (E lsim 10–3, Ro lsim 10–2), the relevant hydrodynamic regime in the superfluid outer core of a neutron star. Numerical simulations of a superfluid Stewartson layer are presented for the first time, showing how the layer is disrupted by nonaxisymmetric instabilities. The unstable ranges of E and Ro are compared with estimates of these quantities in radio pulsars that exhibit glitches. It is found that glitching pulsars lie on the stable side of the instability boundary, allowing differential rotation to build up before a glitch.
External Publication Status:published
Document Type:Article
Communicated by:Bernhard F. Schutz
Affiliations:MPI für Gravitationsphysik/Astrophysical Relativity
Identifiers:ISI:000268867900003 [ID No:1]
DOI:10.1088/0004-637X/701/2/L75
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