The impact of a supernova explosion in a very massive binary

Jun'ichi Sato, Masayuki Umemura, Keisuke Sawada

研究成果: Article査読

抄録

We consider the effect of a supernova (SN) explosion in a very massive binary that is expected to form in a portion of Population III stars with the mass higher than 100 ⊙. In a Population III binary system, a more massive star can result in the formation of a black hole (BH) and a surrounding accretion disc. Such BH accretion could be a significant source of the cosmic reionization in the early Universe. However, a less massive companion star evolves belatedly and eventually undergoes a SN explosion, so that the accretion disc around a BH might be blown off in a lifetime of companion star. In this paper, we explore the dynamical impact of a SN explosion on an accretion disc around a massive BH, and elucidate whether the BH accretion disc is totally demolished or not. For the purpose, we perform three-dimensional hydrodynamic simulations of a verymassive binary system, wherewe assume a BHof 10 3⊙ that results from a direct collapse of a very massive star and a companion star of 100 ⊙ that undergoes a SN explosion. We calculate the remaining mass of a BH accretion disc as a function of time. As a result, it is found that a significant portion of gas disc can survive through three-dimensional geometrical effects even after the SN explosion of a companion star. Even if the SN explosion energy is higher by two orders of magnitude than the binding energy of gas disc, about a half of disc can be left over. The results imply that the Population III BH accretion disc can be a long-lived luminous source, and therefore could be an important ionizing source in the early Universe.

本文言語English
ページ(範囲)1517-1524
ページ数8
ジャーナルMonthly Notices of the Royal Astronomical Society
387
4
DOI
出版ステータスPublished - 2008 7

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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