类型转变的剥离包层超新星SN 2023aew的显著再增亮
Dramatic rebrightening of the type-changing stripped-envelope supernova SN 2023aew
AI总结：
SN 2023aew是一颗具有前身爆发和显著再增亮的超新星，其类型从IIb转变为剥离包层超新星，主峰类似Ibc型，需高镍质量，可能源于包层喷发与SN-CSM相互作用。
摘要：
具有前身爆发的多峰超新星、显著的光变曲线再增亮以及光谱转变是罕见的，但现代夜空暂现源巡天项目（如兹威基暂现源设施（ZTF））正在发现越来越多的此类事件。在此，我们介绍了SN 2023aew的观测和分析，该超新星在经历了一个初始明亮（-17.4等）且持续时间长（约100天）的不寻常的第一个峰值（可能是前身爆发）之后，亮度出现了显著增加。SN 2023aew在第一个峰值期间被分类为IIb型超新星，但在显著的再增亮之后，其类型转变为类似于剥离包层超新星（SESN）。我们将SN 2023aew的光谱演化与SESN亚型进行了比较，并认为在其主峰值期间，它类似于Ibc型超新星。在第一个峰值期间存在P-Cygni巴耳末线，但在第二个峰值的光球层阶段消失，之后Hα在星云阶段再次出现。星云谱线（[O I]、[Ca II]、Mg I]、Hα）显示出双峰结构，这暗示了抛射物是团块状或非球形的。我们分析了SN 2023aew光变曲线中的第二个峰值，发现它比正常的SESNe更宽，并且需要非常高的$^{56}$Ni质量来提供峰值光度。我们讨论了SN 2023aew的可能起源，包括一种喷发场景，其中部分包层在第一个峰值期间被抛出，这也通过SN-CSM相互作用为光变曲线的第二个峰值提供能量。
英文摘要：
Multi-peaked supernovae with precursors, dramatic light-curve rebrightenings, and spectral transformation are rare, but are being discovered in increasing numbers by modern night-sky transient surveys like the Zwicky Transient Facility (ZTF). Here, we present the observations and analysis of SN 2023aew, which showed a dramatic increase in brightness following an initial luminous (-17.4 mag) and long (~100 days) unusual first peak (possibly precursor). SN 2023aew was classified as a Type IIb supernova during the first peak but changed its type to resemble a stripped-envelope supernova (SESN) after the marked rebrightening. We present comparisons of SN 2023aew's spectral evolution with SESN subtypes and argue that it is similar to SNe Ibc during its main peak. P-Cygni Balmer lines are present during the first peak, but vanish during the second peak's photospheric phase, before H$α$ resurfaces again during the nebular phase. The nebular lines ([O I], [Ca II], Mg I], H$α$) exhibit a double-peaked structure which hints towards a clumpy or non-spherical ejecta. We analyze the second peak in the light curve of SN 2023aew and find it to be broader than normal SESNe as well as requiring a very high $^{56}$Ni mass to power the peak luminosity. We discuss the possible origins of SN 2023aew including an eruption scenario where a part of the envelope is ejected during the first peak which also powers the second peak of the light curve through SN-CSM interaction.
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