Core Collapse Supernovae: A Phase Diagram Analysis of the Shock Revival Mechanism

by Daniel Gabay

at Astrophysics and Cosmology Seminar

Wed, 11 Nov 2015, 11:15
Physics building (#54) room 207

Abstract

As massive stars end their life the iron core collapses forming a hydrodynamic shock wave in the inner region This shock stalls few hundred milliseconds later rather than propagating directly to the envelope The delayed neutrino mechanism is believed to play a crucial role in re energizing the shock until it reaches the star s envelope and causes a supernova explosion We show that the propagation of the shock can be analyzed through a series of quasi stationary approximations Those approximations are then used to explore the evolution of the system in phase space fashion shown to provide qualitative and quantitative insights into the initiation of expansion and its nature The prospects for an explosion can be assessed with analogy to a linear damped anti damped oscillator This yields a criterion for the critical neutrino luminosity needed to reach an explosion and is found to be in good agreement with simulations Moreover the mass accretion rate of the star plays a crucial role in the dynamics leading to an explosion We find a critical mass accretion rate below which explosion will occur after several oscillations and above which it will commence in a non oscillatory fashion

Created on 08-11-2015 by Bar Lev, Yevgeny (ybarlev)
Updaded on 08-11-2015 by Bar Lev, Yevgeny (ybarlev)