Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..968..227p&link_type=abstract
ASTROPHYSICS OF COMPACT OBJECTS: International Conference on Astrophysics of Compact Objects. AIP Conference Proceedings, Volum
Astronomy and Astrophysics
Astrophysics
Neutron Stars, Magnetic And Electric Fields, Polarization Of Starlight, Accretion And Accretion Disks, Magnetohydrodynamics And Plasmas, Gravitational Waves: Theory, X-Ray Binaries
Scientific paper
We present detailed, ab initio numerical simulations of the distorted magnetic structure of an accreting neutron star as a function of accreted mass Ma:(i) we evolve an initial dipole through a quasi-static sequence of Grad-Shafranov equilibria while maintaining strict flux-freezing for the first time and (ii) we import these equilibria into the time-dependent, ideal-magnetohydrodynamic (MHD) code ZEUS-3D and load additional mass on to the star dynamically We investigate the stability of these hydromagnetic equilibria by perturbing them in ZEUS-3D in two and three dimeinsions. Surprisingly, in both cases, the equilibria are marginally stable for all Ma<=6×10-4 Msolar. On extending the ZEUS-3D simulations to non-ideal MHD, preliminary results indicate that the equilibria are still not disrupted. The ohmic diffusion time-scale is 105(102) times longer than the accretion time-scale in 2D (3D). The equilibria (``magnetic mountains'') are in general, offset from the spin axis and thus generate gravitational waves. We show that the gravitational wave strain is detectable by Advanced LIGO even after Ohmic dissipation and 3D hydromagnetic instabilities are considered.
Melatos Andrew
Payne D. J. B.
Vigelius Matthias
No associations
LandOfFree
Burial of the polar magnetic field of an accreting neutron star and gravitational wave emission does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Burial of the polar magnetic field of an accreting neutron star and gravitational wave emission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Burial of the polar magnetic field of an accreting neutron star and gravitational wave emission will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1590310