Towards real neutron star seismology: accounting for elasticity and superfluidity
Towards real neutron star seismology: accounting for elasticity and superfluidity
We study the effects of an elastic crust on the oscillation spectrum of superfluid neutron stars. Within the two-fluid formalism, we consider Newtonian stellar models that include the relevant constituents of a mature neutron star. The core is formed by a mixture of superfluid neutrons and a conglomerate of charged particles, while the inner crust is described by a lattice of nuclei permeated by superfluid neutrons. We linearize the Poisson and the conservation equations of non-rotating superfluid stars and study the effects of elasticity, entrainment and composition stratification on the shear and acoustic modes. In both the core and the crust, the entrainment is derived from recent results for the nucleon effective mass. Solving the perturbation equations as an eigenvalue problem, we find that the presence of superfluid neutrons in the crust and their large effective mass may have significant impact on the star’s oscillation spectrum
638-655
Passamonti, A.
d9c7544a-5b0e-4230-9caa-f5a9a6fe9f13
Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
January 2012
Passamonti, A.
d9c7544a-5b0e-4230-9caa-f5a9a6fe9f13
Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Passamonti, A. and Andersson, N.
(2012)
Towards real neutron star seismology: accounting for elasticity and superfluidity.
Monthly Notices of the Royal Astronomical Society, 419 (1), .
(doi:10.1111/j.1365-2966.2011.19725.x).
Abstract
We study the effects of an elastic crust on the oscillation spectrum of superfluid neutron stars. Within the two-fluid formalism, we consider Newtonian stellar models that include the relevant constituents of a mature neutron star. The core is formed by a mixture of superfluid neutrons and a conglomerate of charged particles, while the inner crust is described by a lattice of nuclei permeated by superfluid neutrons. We linearize the Poisson and the conservation equations of non-rotating superfluid stars and study the effects of elasticity, entrainment and composition stratification on the shear and acoustic modes. In both the core and the crust, the entrainment is derived from recent results for the nucleon effective mass. Solving the perturbation equations as an eigenvalue problem, we find that the presence of superfluid neutrons in the crust and their large effective mass may have significant impact on the star’s oscillation spectrum
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e-pub ahead of print date: 17 November 2011
Published date: January 2012
Organisations:
Applied Mathematics
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Local EPrints ID: 338031
URI: http://eprints.soton.ac.uk/id/eprint/338031
ISSN: 1365-2966
PURE UUID: 78b29307-0c2d-470a-aa5c-9d11e2fbcda5
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Date deposited: 18 May 2012 13:57
Last modified: 15 Mar 2024 02:59
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A. Passamonti
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