Astronomy and Astrophysics Seminars

Type IIP supernovae: their progenitors and shock breakout

by Prof. Alak Ray (HBCSE)

Tuesday, December 6, 2022 from to (Asia/Kolkata)
at Hybrid ( AG66 )
https://tifr-res-in.zoom.us/j/96181099077?pwd=RXNQY0FFRHRMUklIMVl6ZEw0ckxVUT09 Meeting ID: 961 8109 9077 Passcode: 639597
Description
If a massive star retains a substantial hydrogen envelope at the time of explosion,it may lead to a type II plateau supernova. I shall describe how the evolution of these stars may proceed and how the supergiant progenitors may populate a Hertzsprung Russell diagram. We take the example of the nearby supernova SN 2013ej and its red supergiant progenitor for a typical case and present evolutionary scenarios computed with the MESA package. Following the collapse of the core of the star, the shockwave breakout with the accompanying electromagnetic display is influenced by the properties of the progenitor star and scripts the history of prior mass loss that took place from the star. We investigate with MESA and STELLA codes the radiative display of supernovae resulting from a set of progenitors that we evolved to core collapse. We simulate with different internal convective overshoot and compositional mixing and two sets of stellar mass loss schema, one the standard "Dutch" scheme and the other an enhanced, episodic mass loss at a late stage. Shock breakout from these stars shows double peaked bolometric light curves for the Dutch wind, as well as high velocity ejecta accelerated during shock breakout. We contrast the breakout flash, including its multi-group photon spectra, with that of optically thick circumstellar media.
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