Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000stin...0205063n&link_type=abstract
Technical Report, DE2001-769262; LA-UR-00-5924
Astronomy and Astrophysics
Astrophysics
Gravitational Waves, Stability, Neutron Stars, Astrophysics, Rotation, Supermassive Stars
Scientific paper
One interesting class of gravitational radiation sources includes rapidly rotating astrophysical objects that encounter dynamical instabilities. We have carried out a set of simulations of rotationally induced instabilities in differentially rotating polytropes. An n=1.5 polytrope with the Maclaurin rotation law will encounter the m=2 bar instability at T/(vert-bar)W(vert-bar) (ge) 0.27. Our results indicate that the remnant of this in-stability is a persistent bar-like structure that emits a long-lived gravitational radiation signal. Furthermore, dynamical instability is shown to occur in n=3.33 polytropes with the j-constant rotation law at T/(vert-bar)W(vert-bar) (ge) 0:14. In this case, the dominant mode of instability is m=1. Such instability may allow a centrifugally-hung core to begin collapsing to neutron star densities on a dynamical timescale. If it occurs in a supermassive star, it may produce gravitational radiation detectable by LISA.
Centrella Joan
New Kim
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