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Oscillations of rapidly rotating stratified neutron stars

Oscillations of rapidly rotating stratified neutron stars
Oscillations of rapidly rotating stratified neutron stars
We use time-evolutions of the linear perturbation equations to study the oscillations of rapidly rotating neutrons stars. Our models account for the buoyancy due to composition gradients and we study, for the first time, the nature of the resultant g-modes in a fast spinning star. We provide detailed comparisons of non-stratified and stratified models. This leads to an improved understanding of the relationship between the inertial modes of a non-stratified star and the g-modes of a stratified system. In particular, we demonstrate that each g-mode becomes rotation-dominated, i.e. approaches a particular inertial mode, as the rotation rate of the star is increased. We also discuss issues relating to the gravitational-wave driven instability of the various classes of oscillation modes.
methods: numerical, stars: neutron, stars: oscillation, stars: rotation
0035-8711
730-741
Passamonti, A.
d9c7544a-5b0e-4230-9caa-f5a9a6fe9f13
Haskell, B.
a3c09067-6932-45cc-902d-3b7117ec848d
Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Jones, D.I.
b8f3e32c-d537-445a-a1e4-7436f472e160
Hawke, I.
fc964672-c794-4260-a972-eaf818e7c9f4
Passamonti, A.
d9c7544a-5b0e-4230-9caa-f5a9a6fe9f13
Haskell, B.
a3c09067-6932-45cc-902d-3b7117ec848d
Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Jones, D.I.
b8f3e32c-d537-445a-a1e4-7436f472e160
Hawke, I.
fc964672-c794-4260-a972-eaf818e7c9f4

Passamonti, A., Haskell, B., Andersson, N., Jones, D.I. and Hawke, I. (2009) Oscillations of rapidly rotating stratified neutron stars. Monthly Notices of the Royal Astronomical Society, 394 (2), 730-741. (doi:10.1111/j.1365-2966.2009.14408.x).

Record type: Article

Abstract

We use time-evolutions of the linear perturbation equations to study the oscillations of rapidly rotating neutrons stars. Our models account for the buoyancy due to composition gradients and we study, for the first time, the nature of the resultant g-modes in a fast spinning star. We provide detailed comparisons of non-stratified and stratified models. This leads to an improved understanding of the relationship between the inertial modes of a non-stratified star and the g-modes of a stratified system. In particular, we demonstrate that each g-mode becomes rotation-dominated, i.e. approaches a particular inertial mode, as the rotation rate of the star is increased. We also discuss issues relating to the gravitational-wave driven instability of the various classes of oscillation modes.

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More information

Published date: April 2009
Keywords: methods: numerical, stars: neutron, stars: oscillation, stars: rotation

Identifiers

Local EPrints ID: 54978
URI: http://eprints.soton.ac.uk/id/eprint/54978
ISSN: 0035-8711
PURE UUID: 165468cb-8d74-439b-87f1-1f1bbb693359
ORCID for N. Andersson: ORCID iD orcid.org/0000-0001-8550-3843
ORCID for D.I. Jones: ORCID iD orcid.org/0000-0002-0117-7567
ORCID for I. Hawke: ORCID iD orcid.org/0000-0003-4805-0309

Catalogue record

Date deposited: 04 Aug 2008
Last modified: 09 Jan 2022 03:19

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Contributors

Author: A. Passamonti
Author: B. Haskell
Author: N. Andersson ORCID iD
Author: D.I. Jones ORCID iD
Author: I. Hawke ORCID iD

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