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

doi:10.1088/2041-8205/772/2/L17

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

SCI - Astronomy

Research output: Contribution to journal › Article › peer-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 M_R = -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 language	English
Article number	L17
Journal	Astrophysical Journal Letters
Volume	772
Issue number	2
DOIs	https://doi.org/10.1088/2041-8205/772/2/L17
Publication status	Published - 2013 Aug 1

Keywords

supernovae: individual (SN 2012au)

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Takaki, K., Kawabata, K. S., Yamanaka, M., Maeda, K., Tanaka, M., Akitaya, H., Fukazawa, Y., Itoh, R., Kinugasa, K., Moritani, Y., Ohsugi, T., Sasada, M., Uemura, M., Ueno, I., Ui, T., Urano, T., Yoshida, M., & Nomoto, KI. (2013). A luminous and fast-expanding type Ib supernova SN 2012au. Astrophysical Journal Letters, 772(2), [L17]. https://doi.org/10.1088/2041-8205/772/2/L17

A luminous and fast-expanding type Ib supernova SN 2012au. / Takaki, Katsutoshi; Kawabata, Koji S.; Yamanaka, Masayuki; Maeda, Keiichi; Tanaka, Masaomi; Akitaya, Hiroshi; Fukazawa, Yasushi; Itoh, Ryosuke; Kinugasa, Kenzo; Moritani, Yuki; Ohsugi, Takashi; Sasada, Mahito; Uemura, Makoto; Ueno, Issei; Ui, Takahiro; Urano, Takeshi; Yoshida, Michitoshi; Nomoto, Ken'Ichi.

In: Astrophysical Journal Letters, Vol. 772, No. 2, L17, 01.08.2013.

Research output: Contribution to journal › Article › peer-review

Takaki, Katsutoshi ; Kawabata, Koji S. ; Yamanaka, Masayuki ; Maeda, Keiichi ; Tanaka, Masaomi ; Akitaya, Hiroshi ; Fukazawa, Yasushi ; Itoh, Ryosuke ; Kinugasa, Kenzo ; Moritani, Yuki ; Ohsugi, Takashi ; Sasada, Mahito ; Uemura, Makoto ; Ueno, Issei ; Ui, Takahiro ; Urano, Takeshi ; Yoshida, Michitoshi ; Nomoto, Ken'Ichi. / A luminous and fast-expanding type Ib supernova SN 2012au. In: Astrophysical Journal Letters. 2013 ; Vol. 772, No. 2.

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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.",

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AU - Takaki, Katsutoshi

AU - Kawabata, Koji S.

AU - Yamanaka, Masayuki

AU - Maeda, Keiichi

AU - Tanaka, Masaomi

AU - Akitaya, Hiroshi

AU - Fukazawa, Yasushi

AU - Itoh, Ryosuke

AU - Kinugasa, Kenzo

AU - Moritani, Yuki

AU - Ohsugi, Takashi

AU - Sasada, Mahito

AU - Uemura, Makoto

AU - Ueno, Issei

AU - Ui, Takahiro

AU - Urano, Takeshi

AU - Yoshida, Michitoshi

AU - Nomoto, Ken'Ichi

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N2 - 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.

AB - 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.

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