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  An Unstable Superfluid Stewartson Layer in a Differentially Rotating Neutron Star

Peralta, C., & Melatos, A. (2009). An Unstable Superfluid Stewartson Layer in a Differentially Rotating Neutron Star. Astrophysical Journal Letters, 701(2), L75-L78. doi:10.1088/0004-637X/701/2/L75.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-64BB-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-64BC-9
Genre: Journal Article

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 Creators:
Peralta, Carlos1, Author              
Melatos, A., Author
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1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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 Abstract: 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.

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 Dates: 2009-08-20
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: eDoc: 442864
ISI: 000268867900003
DOI: 10.1088/0004-637X/701/2/L75
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Title: Astrophysical Journal Letters
Source Genre: Journal
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Pages: - Volume / Issue: 701 (2) Sequence Number: - Start / End Page: L75 - L78 Identifier: -