Why are supersoft X-ray fluxes so weak in early-type galaxies? - A clue to type Ia SNe progenitors -

Mariko Kato

研究成果: Conference contribution

抜粋

Supersoft X-ray fluxes in early-type galaxies provide an excellent test for Type Ia supernovae (SNe Ia) progenitors: the double degenerate (DD) scenario is believed to produce no supersoft sources (SSSs) except just before the SN Ia explosion, while the single degenerate (SD) scenario produces SSSs in some phases of the symbiotic channel. Recent observations of the supersoft X-ray flux of early-type galaxies show a remarkable agreement with theoretical predictions of the SD scenario, which thus turns out to be a strong support for the SD scenario, despite the original observations aimed at the opposite conclusion. Here I explain why X-ray fluxes are so weak in early-type galaxies. (1) Candidate binaries in the SD scenario become SSSs only during a short time on their way to SNe Ia explosions, because they spend a large part of their lifetime in a wind phase. (2) During the SSS phase, symbiotic stars emit very weak supersoft X-ray fluxes even if the WD is very massive. It should be emphasized that supersoft X-ray symbiotic stars are very rare and we need more observations to understand their nature.

元の言語English
ホスト出版物のタイトルBinary Paths to Type Ia Supernovae Explosions
出版者Cambridge University Press
ページ145-148
ページ数4
エディションS281
ISBN(印刷物)9781107019812
DOI
出版物ステータスPublished - 2011 7

出版物シリーズ

名前Proceedings of the International Astronomical Union
番号S281
7
ISSN(印刷物)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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  • これを引用

    Kato, M. (2011). Why are supersoft X-ray fluxes so weak in early-type galaxies? - A clue to type Ia SNe progenitors -. : Binary Paths to Type Ia Supernovae Explosions (S281 版, pp. 145-148). (Proceedings of the International Astronomical Union; 巻数 7, 番号 S281). Cambridge University Press. https://doi.org/10.1017/S1743921312014895