The Advective-Acoustic instability in type II Supernovae
| dc.creator | Galletti, P. | |
| dc.creator | Foglizzo, T. | |
| dc.date | 2005-09-21 | |
| dc.date | 2005-09-26 | |
| dc.date.accessioned | 2026-07-07T06:18:56Z | |
| dc.date.available | 2026-07-07T06:18:56Z | |
| dc.description | The puzzle of birth velocities of pulsars (pulsar kicks) could be solved by an asymmetric explosion of type II Supernovae. We propose a simple hydrodynamical mechanism in order to explain this asymmetry, through the advective-acoustic cycle (Foglizzo 2002) : during the phase of stalled shock, an instability based on the cycle between advected perturbations (entropy / vorticity) and acoustic perturbations can develop between the shock and the surface of the nascent neutron star. Eigenfrequencies are computed numerically, improving the calculation of Houck & Chevalier (1992). The linear instability is dominated by a mode l=1, as observed in the numerical simulations of Blondin et al. (2003) and Scheck et al. (2004). The frequency dependence of the growth rate reveals the presence of the advective-acoustic cycle. | |
| dc.description | 4 pages, 3 figures, conference : SF2A-2005 (Semaine de l'Astrophysique Francaise) | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0509635 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0509635 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/94910 | |
| dc.subject | Astrophysics | |
| dc.title | The Advective-Acoustic instability in type II Supernovae | |
| dc.type | text |