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25 April 2024

» arxiv » 1505.1593

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OISTER Optical and Near-Infrared Observations of Type Iax Supernova 2012Z
Masayuki Yamanaka ; Keiichi Maeda ; Koji S. Kawabata ; Masaomi Tanaka ; Nozomu Tominaga ; Hiroshi Akitaya ; Takahiro Nagayama ; Daisuke Kuroda ; Jun Takahashi ; Yoshihiko Saito ; Kenshi Yanagisawa ; Akihiko Fukui ; Ryo Miyanoshita ; Makoto Watanabe ; Akira Arai ; Mizuki Isogai ; Takashi Hattori ; Hidekazu Hanayama ; Ryosuke Itoh ; Takahiro Ui ; Katsutoshi Takaki ; Issei Ueno ; Michitoshi Yoshida ; Gamal B. Ali ; Ahmed Essam ; Akihito Ozaki ; Hikaru Nakao ; Ko Hamamoto ; Daisaku Nogami ; Tomoki Morokuma ; Yumiko Oasa ; Hideyuki Izumiura ; Kazuhiro Sekiguchi ;
Date:	7 May 2015
Abstract:	We report observations of the Type Iax supernova (SN Iax) 2012Z at optical and near-infrared wavelengths from immediately after the explosion until $sim$ $260$ days after the maximum luminosity using the Optical and Infrared Synergetic Telescopes for Education and Research (OISTER) Target-of-Opportunity (ToO) program and the Subaru telescope. We found that the near-infrared (NIR) light curve evolutions and color evolutions are similar to those of SNe Iax 2005hk and 2008ha. The NIR absolute magnitudes ($M_{J}sim-18.1$ mag and $M_{H}sim-18.3$ mag) and the rate of decline of the light curve ($Delta$ $m_{15}$($B$)$=1.6 pm 0.1$ mag) are very similar to those of SN 2005hk ($M_{J}sim-17.7$ mag, $M_{H}sim$$-18.0$ mag, and $Delta$ $m_{15}$($B$)$sim1.6$ mag), yet differ significantly from SNe 2008ha and 2010ae ($M_{J}sim-14 - -15$ mag and $Delta$ $m_{15}$($B$)$sim2.4-2.7$ mag). The estimated rise time is $12.0 pm 3.0$ days, which is significantly shorter than that of SN 2005hk or any other Ia SNe. The rapid rise indicates that the $^{56}$Ni distribution may extend into the outer layer {f or that the effective opacity may be lower than that in normal SNe Ia}. The late-phase spectrum exhibits broader emission lines than those of SN 2005hk by a factor of 6--8. Such high velocities of the emission lines indicate that the density profile of the inner ejecta extends more than that of SN 2005hk. {f We argue that the most favored explosion scenario is a ’failed deflagration’ model, although the pulsational delayed detonations is not excluded.}
Source:	arXiv, 1505.1593
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