One-armed Spiral Instability in a Low T/|W| Postbounce Supernova Core

Details One-armed Spiral Instability in a Low T/|W| Postbounce Supernova Core One-armed Spiral Instability in a Low T/|W| Postbounce Supernova Core

2005-03-08

arxiv.org/abs/astro-ph/0503187v2

Astrophys.J. 625 (2005) L119-L122

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, final, accepted (ApJL) version

Scientific paper

10.1086/431305

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 solar mass 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 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.

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