论文标题
爆炸前不久，大量的富含氢的超新星祖细胞经历了质量损失的升高
A large fraction of hydrogen-rich supernova progenitors experience elevated mass loss shortly prior to explosion
论文作者
论文摘要
光谱检测狭窄的发射线会追踪围绕巨大恒星爆炸作为核心 - 偏曲超新星的存在。超新星爆炸后不久，短暂的发射线消失了，这表明这种材料的空间范围是紧凑的，因此意味着爆炸前不久的质量损失增加。在这里，我们对在Zwicky瞬态设施（ZTF）调查的第一年中检测到的II型超新星（ZTF）检测到的II型超新星之间的此类瞬态发射线（闪光光谱）进行了系统的调查。我们发现，在估计爆炸时间的两天内获得频谱的十个事件中，至少有六个显示了这种瞬时闪光线的证据。我们测量的闪光事件分数（$> 30 \％$ $ $ 95 \％$ $置信度）表明，质量损失升高是在即将爆炸为超新星的大型恒星中发生的一个常见过程。
Spectroscopic detection of narrow emission lines traces the presence of circumstellar mass distributions around massive stars exploding as core-collapse supernovae. Transient emission lines disappearing shortly after the supernova explosion suggest that the spatial extent of such material is compact, and hence imply an increased mass loss shortly prior to explosion. Here, we present a systematic survey for such transient emission lines (Flash Spectroscopy) among Type II supernovae detected in the first year of the Zwicky Transient Facility (ZTF) survey. We find that at least six out of ten events for which a spectrum was obtained within two days of estimated explosion time show evidence for such transient flash lines. Our measured flash event fraction ($>30\%$ at $95\%$ confidence level) indicates that elevated mass loss is a common process occurring in massive stars that are about to explode as supernovae.
