Matter mixing in core-collapse supernova ejecta : large density perturbations in the progenitor star?

doi:10.1088/0004-637X/808/2/164

Matter mixing in core-collapse supernova ejecta : large density perturbations in the progenitor star?

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Matter mixing in core-collapse supernova ejecta : large density perturbations in the progenitor star?

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punktacja MNiSW [2015 A]: 35

title:	Matter mixing in core-collapse supernova ejecta : large density perturbations in the progenitor star?
author:	Mao Jirong, Ono Masaomi, Nagataki Shigehiro, Hashimoto Masa-aki, Ito Hirotaka, Matsumoto Jin, Dainotti Maria , Lee Shiu-Hang
journal title:	The Astrophysical Journal
volume:	808
issue:	2
date of publication :	2015
article ID:	164
ISSN:	0004-6256
eISSN:	1538-3881
DOI:	10.1088/0004-637X/808/2/164
language:	English
journal language:	English
abstract in English:	Matter mixing is one important topic in the study of core-collapse supernova (CCSN) explosions. In this paper, we perform two-dimensional hydrodynamic simulations to reproduce the high velocity ^{56} Ni clumps observed in SN 1987A. This is the first time that large density perturbation is proposed in the CCSN progenitor to generate Rayleigh–Taylor (RT) instability and make the effective matter mixing. In the case of a spherical explosion, RT instability is efficient at both C+O/He and He/H interfaces of the SN progenitor. Radial coherent structures shown in perturbation patterns are important for obtaining high velocity ^{56} Ni clumps. We can also obtain matter mixing features and high velocity ^{56} Ni clumps in some cases of aspherical explosion. We find that one of the most favorable models in our work has a combination of bipolar and equatorially asymmetric explosions in which at least 25% of density perturbation is introduced at different composition interfaces of the CCSN progenitor. These simulation results are comparable to the observational findings of SN 1987A.
keywords in English:	hydrodynamics, instabilities, nuclear reactions, nucleosynthesis, abundances, supernovae: general
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
type:	journal article
subtype:	academic paper

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