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arXiv 0908.2059astro-ph.HEastro-ph.SR
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极亮Ia型超新星2009 dc的早期观测

Early phase observations of extremely luminous Type Ia Supernova 2009dc

M. Yamanaka, K. S. Kawabata, K. Kinugasa, M. Tanaka, A. Imada, K. Maeda, K. Nomoto, A. Arai, S. Chiyonobu, Y. Fukazawa, O. Hashimoto, S. Honda, Y. Ikejiri, R. I… 展开作者

M. Yamanaka, K. S. Kawabata, K. Kinugasa, M. Tanaka, A. Imada, K. Maeda, K. Nomoto, A. Arai, S. Chiyonobu, Y. Fukazawa, O. Hashimoto, S. Honda, Y. Ikejiri, R. Itoh, Y. Kamata, N. Kawai, T. Komatsu, D. Kuroda, H. Miyamoto, S. Miyazaki, O. Nagae, H. Nakaya, T. Ohsugi, T. Omodaka, N. Sakai, M. Sasada, M. Suzuki, H. Taguchi, H. Takahashi, H. Tanaka, M. Uemura, T. Yamashita, K. Yanagisawa, M. Yoshida

摘要:

我们目前的光学和近红外波长的非常明亮的Ia型超新星(SN Ia)2009 dc的早期阶段的观测。光变曲线的下降速率为$Δm_{15}(B)=0.65\pm 0.03$,是Ia超新星中最慢的。即使宿主消光为$A_{V}=0$ mag,$V$带峰值绝对星等也为$M_{V}=-19.90\pm 0.15$ mag。从观测到的宿主Na { \sc i} D线吸收推断,当宿主消光为$A_{V}=0.29$ mag时,其达到$M_{V}=-20.19\pm 0.19$ mag。我们的$JHK_{s}$波段测光表明,SN是最明亮的Ia超新星之一,也在近红外波长。这些结果表明,SN 2009 dc与SN 2003 fg和SN 2006 gz一样,属于最明亮的超新星Ia。我们估计出的$^{56}$ Ni质量的$1.2\pm 0.3$ $\Msun$没有主机灭绝的情况下(或1.6 $\pm$ 0.4 M $_{\odot}$的主机灭绝的$A_{V}=0.29$等)。C { \sc ii} $λ$ 6580的吸收线在最大亮度后一周内一直可见,在SN 2006 gz中,它在最大亮度前减弱。Si { \sc ii} $λ$ 6355的线速度在最大值附近约为8000 km s $^{-1}$,比SN 2006 gz慢得多,但与SN 2003 fg相当。C { \sc ii}线的速度几乎与Si { \sc ii}线的速度相当。碳线的存在表明,爆炸后仍有厚的未燃烧的C+O层。SN 2009 dc是超拉塞卡质量的超新星Ia的可能候选者。

英文摘要:

We present early phase observations in optical and near-infrared wavelengths for the extremely luminous Type Ia supernova (SN Ia) 2009dc. The decline rate of the light curve is $Δm_{15}(B)=0.65\pm 0.03$, which is one of the slowest among SNe Ia. The peak $V$-band absolute magnitude is $M_{V}=-19.90\pm 0.15$ mag even if the host extinction is $A_{V}=0$ mag. It reaches $M_{V}=-20.19\pm 0.19$ mag for the host extinction of $A_{V}=0.29$ mag as inferred from the observed Na {\sc i} D line absorption in the host. Our $JHK_{s}$-band photometry shows that the SN is one of the most luminous SNe Ia also in near-infrared wavelengths. These results indicate that SN 2009dc belongs to the most luminous class of SNe Ia, like SN 2003fg and SN 2006gz. We estimate the ejected $^{56}$Ni mass of $1.2\pm 0.3$ $\Msun$ for no host extinction case (or 1.6$\pm$ 0.4 M$_{\odot}$ for the host extinction of $A_{V}=0.29$ mag). The C {\sc ii} $λ$6580 absorption line keeps visible until a week after maximum, which diminished in SN 2006gz before its maximum brightness. The line velocity of Si {\sc ii} $λ$6355 is about 8000 km s$^{-1}$ around the maximum, being considerably slower than that of SN 2006gz, while comparable to that of SN 2003fg. The velocity of the C {\sc ii} line is almost comparable to that of the Si {\sc ii}. The presence of the carbon line suggests that thick unburned C+O layers remain after the explosion. SN 2009dc is a plausible candidate of the super-Chandrasekhar mass SNe Ia.

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