Pantheon+样本中一对可能的Refsdal超新星
A pair of possible supernovae Refsdal in the Pantheon+ sample
AI总结：
该研究识别Pantheon+样本中两对光变曲线高度相似的Ia型超新星，推断其可能为强引力透镜产生的Refsdal重复像，并估算透镜距离及致密天体性质。
摘要：
1980年12月，超新星1980N在天炉座星系团中的NGC 1316星系内被发现。三个月后，超新星1981D在同一星系中被观测到。研究发现，这两颗Ia型超新星的光变曲线几乎完全相同，表明它们是同一事件的不同像，二者之间的时间延迟由强引力透镜效应造成。若确实如此，正如Sjur Refsdal所预期的那样，可以精确确定透镜天体的距离，即90 ± 1 kpc，这意味着它属于银河系的外晕。有趣的是，Pantheon+样本中还存在另一对可能的像，即超新星2013aa和2017cbv，其透镜天体的距离为702 ± 1 kpc，几乎与到仙女座星系的距离相同。在这两种情况下，鉴于超新星光被透镜偏折的角度相对较大，分别为271角秒和325角秒，透镜天体必须是致密天体，其质径比超过150 M⊙ R⊙^-1。它很可能是一颗超大质量白矮星。
英文摘要：
On December 1980, supernova 1980N was discovered in NGC 1316, a galaxy of the Fornax cluster. Three months later, supernova 1981D was observed in the same galaxy. The light curves of these two supernovae Ia were found to be virtually identical, suggesting that they are images of the same event, the delay between them being due to strong gravitational lensing. If so, as anticipated by Sjur Refsdal, the distance to the lens can be determined accurately, namely, 90 $\pm$ 1 kpc, meaning that it belongs to the outer halo of the Milky Way. Interestingly, there is another pair of possible images in the Pantheon+ sample, namely, supernovae 2013aa and 2017cbv, the distance to the lens being 702 $\pm$ 1 kpc, that is, nearly the same as the distance to the Andromeda galaxy. In both cases, given the relatively large angle of deviation of the supernova light by the lens, namely, 271" and 325", respectively, the lens has to be a compact object, with a mass to radius ratio over 150 M$_\odot$ R$_\odot^{-1}$. It is likely to be an ultra massive white dwarf.
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。
