The Berkeley sample of stripped-envelope supernovae
The Berkeley sample of stripped-envelope supernovae
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DOI：
10.1093/mnras/sty2719
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发表时间：
2018-10
影响因子：
4.8
通讯作者：
I. Shivvers;A. Filippenko;J. Silverman;Wei Zheng;R. Foley;R. Chornock;A. Barth;S. Cenko;
中科院分区：
文献类型：
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作者：
I. Shivvers;A. Filippenko;J. Silverman;Wei Zheng;R. Foley;R. Chornock;A. Barth;S. Cenko;
我们给出了Lick天文台超新星搜索(Lost)合作在过去30年中观测到的剥离包络超新星(SN)光谱的完整样本：302个SNE的888个光谱，652个光谱，其中384个光谱(92个SNE)具有光度确定的相位。在校正红移和银河系尘埃变红并重新评估每个SN的光谱分类后，我们按位相构造了三个主要光谱亚型(IIb、Ib和Ic)的平均光谱。我们将这一样本的谱线强度和宽度的测量结果与以前的工作结果进行了比较，证实了在峰值亮度30天后的第一个λ中，IC型SNE的O I∼7774型吸收更强，速度更快，尽管星云发射线的宽度在不同亚型之间是一致的。我们还重点介绍了几个感兴趣的稀有亚群的最新观察结果。
We present the complete sample of stripped-envelope supernova (SN) spectra observed by the Lick Observatory Supernova Search (LOSS) collaboration over the last three decades: 888 spectra of 302 SNe, 652 published here for the first time, with 384 spectra (of 92 SNe) having photometrically determined phases. After correcting for redshift and Milky Way dust reddening and reevaluating the spectroscopic classifications for each SN, we construct mean spectra of the three major spectral subtypes (Types IIb, Ib, and Ic) binned by phase. We compare measures of line strengths and widths made from this sample to the results of previous efforts, confirming that O I λ7774 absorption is stronger and found at higher velocity in Type Ic SNe than in Types Ib or IIb SNe in the first ∼30 days after peak brightness, though the widths of nebular emission lines are consistent across subtypes. We also highlight newly available observations for a few rare subpopulations of interest.