A luminous and fast-expanding type Ib supernova SN 2012au

Katsutoshi Takaki, Koji S. Kawabata, Masayuki Yamanaka, Keiichi Maeda, Masaomi Tanaka, Hiroshi Akitaya, Yasushi Fukazawa, Ryosuke Itoh, Kenzo Kinugasa, Yuki Moritani, Takashi Ohsugi, Mahito Sasada, Makoto Uemura, Issei Ueno, Takahiro Ui, Takeshi Urano, Michitoshi Yoshida, Ken'Ichi Nomoto

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

We present a set of photometric and spectroscopic observations of a bright Type Ib supernova SN 2012au from -6 days until + 150 days after maximum. The shape of its early R-band light curve is similar to that of an average Type Ib/c supernova. The peak absolute magnitude is MR = -18.7 ± 0.2 mag, which suggests that this supernova belongs to a very luminous group among Type Ib supernovae. The line velocity of He I λ5876 is about 15,000 km s-1 around maximum, which is much faster than that in a typical Type Ib supernova. From the quasi-bolometric peak luminosity of (6.7 ± 1.3) × 1042 erg s-1, we estimate the 56Ni mass produced during the explosion as 0.30 M. We also give a rough constraint to the ejecta mass 5-7 M and the kinetic energy (7-18) × 1051 erg. We find a weak correlation between the peak absolute magnitude and He I velocity among Type Ib SNe. The similarities to SN 1998bw in the density structure inferred from the light-curve model as well as the large peak bolometric luminosity suggest that SN 2012au had properties similar to energetic Type Ic supernovae.

Original languageEnglish
Article numberL17
JournalAstrophysical Journal Letters
Volume772
Issue number2
DOIs
Publication statusPublished - 2013 Aug 1
Externally publishedYes

Keywords

  • supernovae: individual (SN 2012au)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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