大质量恒星在富氦的星周介质中爆炸。VI。La Silla-QUEST发现的两个遥远的Ibn型超新星候选者的观测
Massive stars exploding in a He-rich circumstellar medium. VI. Observations of two distant Type Ibn supernova candidates discovered by La Silla-QUEST
摘要：
本文介绍了La Silla-QUEST巡天发现的奇特的带状包络超新星（SNe）LSQ 12 btw和LSQ 13 ccw的光学观测。LSQ 12 btw达到M（g）= -19.3 +-0.2的绝对峰值幅度，并显示出不对称的光变曲线。严格的发现前限制限制了它达到最大亮度的上升时间小于4天，峰后光度下降较慢，类似于SN~Ibn 2006 jc的原型。LSQ 13 ccw有些不同：虽然它也表现出非常快的上升到最大值，但它达到了一个较暗的绝对峰值（M（g）= -18.4 +- 0.2），并经历了一个非常快速的峰后下降，类似于在特殊的SN~Ib 2002 bj中观察到的。一个严格的预发现的限制和早期边缘检测LSQ 13 ccw允许我们确定爆炸时间的不确定性为1天。LSQ 12 btw的光谱显示出典型的Ibn型超新星的窄He~I发射线，表明超新星喷出物与富He的星周物质发生了相互作用。LSQ 13 ccw的He I谱线表现出叠加在宽谱线上的弱窄谱线。一个未解决的Halpha线也被检测到，这表明一个试探性的类型Ibn/IIn分类。对于其他的SNe~Ibn，我们认为LSQ 12 btw和LSQ 13 ccw可能是由在核心坍缩之前经历了不稳定阶段的Wolf-Rayet星的爆炸引起的。我们检查的主机星系的SNe伊本，我们表明，所有的，但一个托管在螺旋星系，可能在环境中跨越广泛的金属丰度范围。
英文摘要：
We present optical observations of the peculiar stripped-envelope supernovae (SNe) LSQ12btw and LSQ13ccw discovered by the La Silla-QUEST survey. LSQ12btw reaches an absolute peak magnitude of M(g) = -19.3 +- 0.2, and shows an asymmetric light curve. Stringent prediscovery limits constrain its rise time to maximum light to less than 4 days, with a slower post-peak luminosity decline, similar to that experienced by the prototypical SN~Ibn 2006jc. LSQ13ccw is somewhat different: while it also exhibits a very fast rise to maximum, it reaches a fainter absolute peak magnitude (M(g) = -18.4 +- 0.2), and experiences an extremely rapid post-peak decline similar to that observed in the peculiar SN~Ib 2002bj. A stringent prediscovery limit and an early marginal detection of LSQ13ccw allow us to determine the explosion time with an uncertainty of 1 day. The spectra of LSQ12btw show the typical narrow He~I emission lines characterising Type Ibn SNe, suggesting that the SN ejecta are interacting with He-rich circumstellar material. The He I lines in the spectra of LSQ13ccw exhibit weak narrow emissions superposed on broad components. An unresolved Halpha line is also detected, suggesting a tentative Type Ibn/IIn classification. As for other SNe~Ibn, we argue that LSQ12btw and LSQ13ccw likely result from the explosions of Wolf-Rayet stars that experienced instability phases prior to core collapse. We inspect the host galaxies of SNe Ibn, and we show that all of them but one are hosted in spiral galaxies, likely in environments spanning a wide metallicity range.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
