Neutron star crust can support a large ellipticity - INSPIRE

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Neutron star crust can support a large ellipticity

J.A. Morales
(
- Indiana U., CEEM
)
,
C.J. Horowitz
(
- Indiana U., CEEM
)

Sep 7, 2022

9 pages

Published in:

Mon.Not.Roy.Astron.Soc. 517 (2022) 4, 5610-5616

Published: Nov 17, 2022

e-Print:

2209.03222 [gr-qc]

DOI:

10.1093/mnras/stac3058

View in:

ADS Abstract Service

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Abstract: (Oxford University Press)

Non-axisymmetrical deformations of the crust on rapidly rotating neutron stars are one of the main targets of searches for continuous gravitational waves. The maximum ellipticity, or fractional difference in moments of inertia, which can be supported by deformations of the crust (known as ‘mountains’), provides an important upper limit on the strength of these continuous gravitational wave sources. We use the formalism developed by Gittins and Andersson, along with a deforming force that acts mainly in the transverse direction, to obtain a maximum ellipticity of 7.4 × 10^−6. This is larger than the original results that Gittins and Andersson obtained but consistent with earlier calculations by Ushomirsky, Cutler, and Bildsten. This suggests that rotating neutron stars could be strong sources of continuous gravitational waves.

Note:

9 pages, 5 figures, minor revisions MNRAS in press

gravitational waves
stars: neutron
neutron star: rotation
gravitational radiation
deformation
fractional
transverse

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Figures(5)

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