Sinking of a magnetically confined mountain on an accreting neutron star

Details Sinking of a magnetically confined mountain on an accreting neutron star Sinking of a magnetically confined mountain on an accreting neutron star

2009-10-27

arxiv.org/abs/0910.5064v1

MNRAS 402 1099--1110 (2010)

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

13 pages, 12 figures, and 3 tables; accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2009.15937.x

We perform ideal-magnetohydrodynamic axisymmetric simulations of magnetically confined mountains on an accreting neutron star, with masses less than ~0.12 solar masses. We consider two scenarios, in which the mountain sits atop a hard surface or sinks into a soft, fluid base. We find that the ellipticity of the star, due to a mountain grown on a hard surface, approaches ~2e-4 for accreted masses greater than ~1.2e-3 solar masses, and that sinking reduces the ellipticity by between 25% and 60%. The consequences for gravitational radiation from low-mass x-ray binaries are discussed.

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