Dependence of Failed Supernova on Progenitor Models

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Dependence of failed supernova on progenitor models Kazuki Onogi,Hideyuki Suzuki Tokyo University of Science,Noda Chiba 278-8510,Japan Failed supernova We study the ejection of mass during stellar core-collapse when the stalled shock does not revive and a black hole forms. Phenomenon Neutrino emission during the protoneutron star phase reduces the gravitational mass of the core, resulting in an outward going sound pulse that steepens into a shock as it travels out through the star. Purpose Identify the dependence on neutrino emission and progenitor model Method and models We use 1D stellar evolution code MESA and 1D time-dependent hydrodynamic simulation which can treat neutrino mass loss parametrically. We use exponential neutrino cooling model which is same as Fernandez(2017) MG: gravitational mass of protoneutron star MB:the baryonic mass of protoneutron star BEC: the binding energy of a cold neutron star , M* ��# = 0.084 M⊙ τc: neutrino cooling time(~3s) M⊙ This model emit most of the energy as neutrino Stop the neutrino emission once in �4. the black hole form � = 0.1�, � = 2.0� 4 9:; ⨀ Results Fig 1 is a velocity profile of the star. It shows the shock propagate toward the surface of the star. The protoneutron star is also extremely hot and thus behaves in different manner from cold neutron stars. change the paremeter neutrino cooling time �? ,maximum Fig 1:shock propagation mass of neutron star systematically (0.1s ≤ �? ≤ 5.0s, 2.2M⊙ ≤ �9:; ≤ 2.8M⊙) �9:; = 2.6�⨀ Fig2 shows the velocity profile with different τc after shock breakout. the case, �? = 5.0s shows lower energy because the time reaching to the maximum mass of netron star is around 5s. Although the shock decrease in strength by the time it reaches the surface,we can see maximum mass of neutron star and neutrino cooling time affects the final shock energy. Fig 2: Dependence on �4.

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