宽线超新星2016 coi与氦包层
Broad-Lined Supernova 2016coi with Helium Envelope
摘要：
本文给出了宽线超新星（SN）2016 coi从估计爆发日期后的$t=7$到$67$天的早期光谱和光变曲线。该SN最初报告为广义SN Ic型（SN Ic-BL）。然而，我们发现直到$t=12$天的光谱显示He~{ \sc i} $λ$ 5876、$λ$ 6678和$λ$ 7065吸收线。我们发现，平滑和蓝移光谱的正常SNe Ib是非常相似的观测光谱SN 2016 coi。SN 2016 coi的线速度与SNe Ic-BL相似，但明显快于SNe Ib。线速度和光变曲线的分析表明，SN 2016 coi的动能和总喷出物质量与SNe Ic-BL相似。与已发现He~{ \sc i}的广义SNe 2009 bb和2012 ap一起，这些SNe可能是介于SNe Ic-BL和SNe Ib之间的过渡天体，属于广义“Ib”型SNe（SNe“Ib”-BL）。我们的工作证明了宽线SNe的最外层的多样性，这应该与进化路径的多样性有关。
英文摘要：
We present the early-phase spectra and the light curves of the broad-lined supernova (SN) 2016coi from $t=7$ to $67$ days after the estimated explosion date. This SN was initially reported as a broad-lined Type SN Ic (SN Ic-BL). However, we found that spectra up to $t=12$ days exhibited the He~{\sc i} $λ$5876, $λ$6678, and $λ$7065 absorption lines. We show that the smoothed and blueshifted spectra of normal SNe Ib are remarkably similar to the observed spectrum of SN 2016coi. The line velocities of SN 2016coi were similar to those of SNe Ic-BL and significantly faster than those of SNe Ib. Analyses of the line velocity and light curve suggest that the kinetic energy and the total ejecta mass of SN 2016coi are similar to those of SNe Ic-BL. Together with broad-lined SNe 2009bb and 2012ap for which the detection of He~{\sc i} were also reported, these SNe could be transitional objects between SNe Ic-BL and SNe Ib, and be classified as broad-lined Type `Ib' SNe (SNe `Ib'-BL). Our work demonstrates the diversity of the outermost layer in broad-lined SNe, which should be related to the variety of the evolutionary paths.
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