Gravitational radiation back-reaction from f-modes on neutron stars
Gravitational radiation back-reaction from f-modes on neutron stars
The problem of the gravitational radiation damping of neutron star fundamental (f) mode oscillations has received considerable attention. Many studies have looked at the stability of such oscillations in rapidly rotating stars, calculating the growth or decay rate of the mode amplitude. In this paper, we look at the relatively neglected problem of the radiation reaction on the spin of the star. We specialize greatly to the so-called Kelvin modes: The modes of oscillation of (initially) non-rotating incompressible stars. We find the unexpected result that the excitation of a mode of angular momentum δJ on an initially non-rotating star ends up radiating an angular momentum 2δJ to infinity, leaving the star itself with a bulk angular momentum of -δJ. This result is interesting in itself, and also will have implications for the angular momentum budgets of spinning down neutron stars, should such modes be excited.
Asteroseismology, Gravitational waves, Hydrodynamics, Methods: Analytical, Stars: Oscillations, Stars: neutron
1942-1960
Yim, Garvin
e99f1832-0e5e-4a9a-ade5-0240de377034
Jones, D. I.
b8f3e32c-d537-445a-a1e4-7436f472e160
1 April 2022
Yim, Garvin
e99f1832-0e5e-4a9a-ade5-0240de377034
Jones, D. I.
b8f3e32c-d537-445a-a1e4-7436f472e160
Yim, Garvin and Jones, D. I.
(2022)
Gravitational radiation back-reaction from f-modes on neutron stars.
Monthly Notices of the Royal Astronomical Society, 511 (2), .
(doi:10.1093/mnras/stac009).
Abstract
The problem of the gravitational radiation damping of neutron star fundamental (f) mode oscillations has received considerable attention. Many studies have looked at the stability of such oscillations in rapidly rotating stars, calculating the growth or decay rate of the mode amplitude. In this paper, we look at the relatively neglected problem of the radiation reaction on the spin of the star. We specialize greatly to the so-called Kelvin modes: The modes of oscillation of (initially) non-rotating incompressible stars. We find the unexpected result that the excitation of a mode of angular momentum δJ on an initially non-rotating star ends up radiating an angular momentum 2δJ to infinity, leaving the star itself with a bulk angular momentum of -δJ. This result is interesting in itself, and also will have implications for the angular momentum budgets of spinning down neutron stars, should such modes be excited.
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Published date: 1 April 2022
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© 2022 The Author(s).
Keywords:
Asteroseismology, Gravitational waves, Hydrodynamics, Methods: Analytical, Stars: Oscillations, Stars: neutron
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Local EPrints ID: 454333
URI: http://eprints.soton.ac.uk/id/eprint/454333
ISSN: 1365-2966
PURE UUID: 0d81c8e8-a7d2-4856-809f-f3c8691d31f4
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Date deposited: 07 Feb 2022 17:45
Last modified: 17 Mar 2024 02:48
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Garvin Yim
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