MATTER MIXING in CORE-COLLAPSE SUPERNOVA EJECTA: LARGE DENSITY PERTURBATIONS in the PROGENITOR STAR?

Jirong Mao, Masaomi Ono, Shigehiro Nagataki, Masa Aki Hashimoto, Hirotaka Ito, Jin Matsumoto, Maria G. Dainotti, Shiu Hang Lee

研究成果: Article査読

10 被引用数 (Scopus)

抄録

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 56Ni 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 56Ni clumps. We can also obtain matter mixing features and high velocity 56Ni 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.

本文言語English
論文番号164
ジャーナルAstrophysical Journal
808
2
DOI
出版ステータスPublished - 2015 8 1
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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