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arXiv 1805.02420astro-ph.HEastro-ph.SR
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SN 2014 J星云光谱:近红外光谱中稳定镍的探测

Nebular spectroscopy of SN 2014J: Detection of stable nickel in near infrared spectra

S. Dhawan, A. Flörs, B. Leibundgut, K. Maguire, W. Kerzendorf, S. Taubenberger, M. H. Van Kerkwijk, J. Spyromilio

摘要:

我们提出了近红外(NIR)光谱的附近超新星2014 J获得$\sim$ 450 d后爆炸。我们检测到的[Ni II] 1.939 $μ$ m线的光谱表明存在稳定的$^{58}$镍在喷出物。稳定的镍不是集中在中心,而是像铁一样分布。光谱主要由[Fe II]和[Co II]禁戒线组成。我们使用的线,在近红外光谱,从相同的上能级产生的地方从宿主星系尘埃的灭绝的限制。我们发现,我们的数据是一致的高$A_V$和低$R_V$在早期的研究中发现的数据接近最大光。使用$^{56}$镍质量之前,从近最大光$γ$射线观测,我们发现$\sim$ 0.05 M $_\odot$的稳定镍是目前在喷出物。我们发现铁群特征相对于主星系静止坐标系红移了600 km s $\sim$。

英文摘要:

We present near infrared (NIR) spectroscopy of the nearby supernova 2014J obtained $\sim$450 d after explosion. We detect the [Ni II] 1.939 $μ$m line in the spectra indicating the presence of stable $^{58}$Ni in the ejecta. The stable nickel is not centrally concentrated but rather distributed as the iron. The spectra are dominated by forbidden [Fe II] and [Co II] lines. We use lines, in the NIR spectra, arising from the same upper energy levels to place constraints on the extinction from host galaxy dust. We find that that our data are in agreement with the high $A_V$ and low $R_V$ found in earlier studies from data near maximum light. Using a $^{56}$Ni mass prior from near maximum light $γ$-ray observations, we find $\sim$0.05 M$_\odot$ of stable nickel to be present in the ejecta. We find that the iron group features are redshifted from the host galaxy rest frame by $\sim$600 km s$^{-1}$.

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