Late-phase observations of a super-chandrasekhar SN Ia

M. Yamanaka, K. S. Kawabata, K. Maeda, M. Tanaka, M. Yoshida, T. Hattori, K. Nomoto, T. Komatsu, T. Okushima

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

A super-Chandrasekhar (SC) supernova (SN) has an extremely high luminosity and a slow decline rate of the light curve in the early-phase. We present late-phase observations of the SC SN 2009dc. We find that the optical luminosity a year after maximum is much fainter than that expected from its early luminosity. We attempt to fit the analytic light curve model to the observations using Arnett's rule. The model successfully explains the light curves until 120 days. This suggests that the extremely high luminosity originates from the 56Ni decay. We suggest that the late-phase decline would be caused by dust formation. The existence of strong carbon features in early-phase spectra would support this scenario. We also find a blend of [Ca II] and [Ni II] in its late-phase spectrum. This indicates that the calcium is distributed in the inner layer along with nickel and iron. We conclude that the mixing may occur in the inner parts of the ejecta.

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319-321
ページ数3
S281
ISBN(印刷版)9781107019812
DOI
出版ステータスPublished - 2011 7
外部発表はい

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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