A single degenerate model for ultra super-chandrasekhar mass progenitors of type Ia supernovae - Young and low metallicity environments -

Izumi Hachisu, Mariko Kato, Hideyuki Saio, Ken'ichi Nomoto

研究成果: Conference contribution

抄録

Some Type Ia supernovae (SNe Ia) are suggested to have progenitor white dwarfs (WDs) with mass of up to 2.4-2.8 M, highly exceeding the Chandrasekhar mass limit. We present a new single degenerate (SD) model for SNe Ia progenitors, in which the WD mass can increase by accretion up to 2.3 (2.7) M from the initial value of 1.1 (1.2) M. The results are consistent with high luminosity SNe Ia such as SN 2003fg, SN 2006gz, SN 2007if, and SN 2009dc. There are three characteristic mass ranges of exploding WDs. In an extreme massive case, differentially rotating WDs explode as a SNe Ia soon after the WD mass exceeds 2.4 M because of a secular instability at T/|W|~0.14. For a mid mass range of MWD = 1.5-2.4 M, which is supported by differential rotation, it takes some spinning-down time until carbon is ignited to induce an SN Ia explosion. For a lower mass range of MWD = 1.38-1.5 M , they can be supported by rigid rotation until the angular momentum is lost. We also suggest the ultra super-Chandrasekhar mass SNe Ia are born in young and low metallicity environments.

本文言語English
ホスト出版物のタイトルBinary Paths to Type Ia Supernovae Explosions
出版社Cambridge University Press
ページ76-79
ページ数4
S281
ISBN(印刷版)9781107019812
DOI
出版ステータスPublished - 2011 7

出版物シリーズ

名前Proceedings of the International Astronomical Union
番号S281
7
ISSN(印刷版)1743-9213
ISSN(電子版)1743-9221

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

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