Other
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.4303p&link_type=abstract
American Astronomical Society, HEAD meeting #11, #43.03; Bulletin of the American Astronomical Society, Vol. 41, p.732
Other
Scientific paper
Magnetically confined mountains on accreting neutron stars are promising sources of continuous-wave gravitational radiation and are currently the targets of directed searches with long-baseline detectors like the Laser Interferometer Gravitational Wave Observatory (LIGO). In this paper, previous ideal-magnetohydrodynamic (ideal-MHD) isothermal mountains are generalised to a range of physically motivated, adiabatic equations of state. It is found that the mass ellipticity drops substantially, from 3e-4 (isothermal) to 9e-7 (non-relativistic degenerate neutrons), 6e-8 (relativistic degenerate electrons), and 1e-8 (non-relativistic degenerate electrons) (and a magnetic field of 3e12 G at birth). Similar results are obtained for a realistic, piecewise-polytropic nuclear equation of state. The adiabatic models are consistent with current LIGO upper limits, unlike the isothermal models. Updated estimates of gravitational-wave detectability are made. Monte Carlo simulations of the spin distribution of accreting millisecond pulsars including gravitational-wave stalling agree better with observations for certain adiabatic equations of state, implying that X-ray spin measurements can probe the equation of state when coupled with magnetic mountain models.
Melatos Andrew
Payne D. J. B.
Priymak Maxim
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