2002/10/05 by O. Zanotti, L. Rezzolla, J. A. Font
Physics and Astronomy · #Accretion (finance) #Angular momentum #Astrophysical Phenomena and Observations #Black hole (networking) #Compact star #Gamma-ray bursts and supernovae #Gravitational wave #Gravitational-wave observatory #Neutron star #Pulsars and Gravitational Waves Research #Schwarzschild radius #Stellar black hole #Torus #astro-ph #gr-qc
paper · pdf · doi:10.1046/j.1365-8711.2003.06474.x
published as Mon.Not.Roy.Astron.Soc.341:832,2003 · 17 pages, 12 figures. Animations can be found at http://www.sissa.it/~rezzolla/movies.html
arxiv created 2002/10/05 · openalex publication_date 2003/05/12 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present general relativistic hydrodynamics simulations of constant specific angular momentum tori orbiting a Schwarzschild black hole. These tori are expected to form as a result of stellar gravitational collapse, binary neutron star merger or disruption, can reach very high rest-mass densities and behave effectively as neutron stars but with a toroidal topology (i.e. ‘toroidal neutron stars’). Here our attention is focused on the dynamical response of these objects to axisymmetric perturbations. We show that upon the introduction of perturbations, these systems either become unstable to the runaway instability or exhibit a regular oscillatory behaviour, resulting in a quasi-periodic variation of the accretion rate as well as of the mass quadrupole. The latter, in particular, is responsible for the emission of intense gravitational radiation for which the signal-to-noise ratio at the detector is comparable to or larger than the typical one expected in stellar-core collapse, making these new sources of gravitational waves potentially detectable. We discuss a systematic investigation of the parameter space in both the linear and non-linear regimes, providing estimates of how the gravitational radiation emitted depends on the mass of the torus and on the strength of the perturbation.