#metallictie

[arxt1]

Pulsational Pair-Instability Supernova I: Pre-collapse Evolution and Pulsational Mass Ejection. (arXiv:1901.11136v2 [astro-ph.HE] UPDATED)

We calculate the evolution of stars with the initial masses of 80 - 140 $M_{\odot}$ from the main-sequence through the beginning of Fe core collapse for six metallicities of $Z = 10^{-3} - 1.0$ $Z_\odot$. Our calculations show that these stars undergo pulsational pair-instability (PPI) when the O-rich core is formed for metallicity $Z < 0.5$ $Z_\odot$. Here electron-positron pair production causes a rapid contraction of the O-rich core which triggers explosive O-burning, strong pulsation of the core and enormous mass ejection in the high mass end. We focus on the hydrodynamical evolution of the He cores at zero metallicty for eight masses of $40 - 64$ $M_\odot$ to study the mass dependence of the pulsation dynamics, i.e., mass ejection history, thermodynamics, energetics, luminosity and chemical abundances. We find that the resultant H-free circumstellar matter (CSM) around the star is massive enough for explaining the observed light curve of Type I (H-free) super-luminous supernovae with circumstellar interaction. We also note that the mass ejection sets the maximum mass of black holes (BHs) to be $\sim 50$ $M_{\odot}$, which is consistent with the mass of recently detected massive BHs by VIRGO and aLIGO. We compare our results with several other works.

from astro-ph.HE updates on arXiv.org https://ift.tt/2JcU2bU

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