7 papers
The Advective-Acoustic instability in type II Supernovae
P. Galletti, T. Foglizzo
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…
Non-radial instability of stalled accretion shocks: advective-acoustic cycle
Thierry Foglizzo, Pascal Galletti
The linear stability of stalled accretion shocks is investigated in the context of core collapse of type II supernovae. We focus on a particular instability mechanism based on the…
Entropic-Acoustic instability in shocked accretion flows
T. Foglizzo, M. Tagger
A new instability mechanism is described in accretion flows where the gas is accelerated from a stationary shock to a sonic surface. The instability is based on a cycle of acoustic…
An analytic study of Bondi-Hoyle-Lyttleton accretion
T. Foglizzo, M. Ruffert
The adiabatic shock produced by a compact object moving supersonically relative to a gas with uniform entropy and no vorticity is a source of entropy gradients and vorticity. We in…
Are solar granules the only source of acoustic oscillations ?
Thierry Foglizzo
The excitation mechanism of low degree acoustic modes is investigated through the analysis of the stochastic time variations of their energy. The correlation between the energies o…
Are Solar Acoustic Modes Correlated ?
T. Foglizzo, R. A. Garcia, P. Boumier +7
We have studied the statistical properties of the energy of individual acoustic modes, extracted from 310 days of GOLF data near the solar minimum. The exponential distribution of…