arXiv 1602.053342016-02astro-ph.SRastro-ph.HE

NGC 7250中Ia型超新星SN 2013 dy的紫外光学观测

UV-Optical Observation of Type Ia Supernova SN 2013dy in NGC 7250

Qian Zhai, JuJia Zhang, XiaoFeng Wang, TianMeng Zhang, ZhengWei Liu, Peter J. Brown, Fang Huang, XuLin Zhao, Liang Chang, WeiMin Yi, ChuanJun Wang, YuXin Xin, J… 展开作者

Qian Zhai, JuJia Zhang, XiaoFeng Wang, TianMeng Zhang, ZhengWei Liu, Peter J. Brown, Fang Huang, XuLin Zhao, Liang Chang, WeiMin Yi, ChuanJun Wang, YuXin Xin, JianGuo Wang, BaoLi Lun, XiLiang Zhang, YuFeng Fan, XiangMing Zheng, JinMing Bai

备注：: 16pages, 14 figures and 8 tables. Accepted for publication in AJ
DOI：: 10.3847/0004-6256/151/5/125

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摘要：

本文介绍了对Ia型超新星SN 2013 dy的广泛和独立的观测，包括从峰值亮度前几天到爆炸后200天的大量$UBVRI$测光和光谱，以及从$t \approx -10$天到$t \approx\ +15$天的紫外（UV）测光。峰值亮度（即，$M_{\rm B} = -19.65 \pm 0.40$ mag，$L_{\rm max} = [1.95 \pm 0.55] \times 10^{43}$ erg s $^{-1}$）和合成的$^{56}$ Ni的质量（即，$M$（$^{56}$ Ni）= 0.90 $\pm$ 0.26 M $_{\odot}$），并且它们符合具有缓慢下降速率的SN Ia的预期（即，$Δm_{15}(B)$ = 0.90 $\pm$ 0.03 mag，Phillips 1993）。然而，该SN的近红外（NIR）亮度（即，$M_{\rm H} = -17.33 \pm 0.30$ mag）比平时暗至少1.0 mag。此外，光谱分类表明SN 2013 dy位于Branch等（2009）分类方案中的“核心正常”和“浅硅”子类的边界上，或位于Wang等（2009 a）系统中的“正常速度”SNe Ia和91 T/99 aa类事件的边界上。这表明SN 2013 dy是一个缓慢下降的Ia型超新星，位于名义光谱子类的过渡区，可能不是Ia型超新星的典型正常样本。

英文摘要：

Extensive and independent observations of Type Ia supernova (SN Ia) SN 2013dy are presented, including a larger set of $UBVRI$ photometry and optical spectra from a few days before the peak brightness to $\sim$ 200 days after explosion, and ultraviolet (UV) photometry spanning from $t \approx -10$ days to $t \approx\ +15$ days referring to the $B$ band maximum. The peak brightness (i.e., $M_{\rm B} = -19.65 \pm 0.40$ mag, $L_{\rm max} = [1.95 \pm 0.55] \times 10^{43}$ erg s$^{-1}$) and the mass of synthesised $^{56}$Ni (i.e., $M$($^{56}$Ni) = 0.90 $\pm$ 0.26 M$_{\odot}$) are calculated, and they conform to the expectation for a SN Ia with a slow decline rate (i.e., $Δm_{15}(B)$ = 0.90 $\pm$ 0.03 mag, Phillips 1993). However, the near infrared (NIR) brightness of this SN (i.e., $M_{\rm H} = -17.33 \pm 0.30$ mag) is at least 1.0 mag fainter than usual. Besides, spectroscopy classification reveals that SN 2013dy resides on the border of "core normal" and "shallow silicon" subclasses in the Branch et al. (2009) classification scheme, or on the border of the "normal velocity" SNe Ia and 91T/99aa-like events in the Wang et al. (2009a) system. These suggest that SN 2013dy is a slow-declining SN Ia located on the transitional region of nominal spectroscopic subclasses and might not be a typical normal sample of SNe Ia.

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