One-armed Spiral Instability in a Low-T/|W| Postbounce Supernova Core
Abstract
A three-dimensional, Newtonian hydrodynamic technique is used to follow the postbounce phase of a stellar core collapse event. For realistic initial data, we have employed post-core-bounce snapshots of the iron core of a 20 Msolar star. The models exhibit strong differential rotation but have centrally condensed density stratifications. We demonstrate for the first time that such postbounce cores are subject to a so-called low-T/|W| nonaxisymmetric instability and, in particular, can become dynamically unstable to an (m=1)-dominated spiral mode at T/|W| ~0.08. We calculate the gravitational wave (GW) emission by the instability and find that the emitted waves may be detectable by current and future GW observatories from anywhere in the Milky Way.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 2005
- DOI:
- 10.1086/431305
- arXiv:
- arXiv:astro-ph/0503187
- Bibcode:
- 2005ApJ...625L.119O
- Keywords:
-
- Gravitational Waves;
- Hydrodynamics;
- Instabilities;
- Stars: Neutron;
- Stars: Rotation;
- Astrophysics;
- General Relativity and Quantum Cosmology
- E-Print:
- 4 pages, 4 figures, final, accepted (ApJL) version