论文标题
1991t样超新星的绝对幅度
The Absolute Magnitudes of 1991T-like Supernovae
论文作者
论文摘要
1991T样的超新星是IA型超新星的分支浅层硅（SS）子类的发光，缓慢的极端。它们的区别于极度弱的Ca II H＆K和Si II $ \ lambda6355 $，在其光谱中以最大最大的最大阶段的形式在其光谱中具有强大的Fe III吸收特征，并且与正常的IA型超新星相比，长期以来一直怀疑是过度的。在本文中，Si II $λ$ 6355的伪当量宽度是从$ \ \ leq+10 $ 10 $天获得的，与$ i $ band Light曲线的形态相结合，以识别Carnegie Supernova Project-ipy-band Light曲线的形态，以识别1991T类似于的Supernovae样品。哈勃图残差表明，在光学和近红外波长下，这些事件相对于较小的极端分支SS（1999aa-like）和分支核心正常的超级novae $ \ sim $ \ sim $ 0.1-0.5 mag，具有相似的$ b $ band bum-band-band-bang-band-bang-bang-bang-bang-byr-supernovae。
1991T-like supernovae are the luminous, slow-declining extreme of the Branch shallow-silicon (SS) subclass of Type Ia supernovae. They are distinguished by extremely weak Ca II H & K and Si II $\lambda6355$ and strong Fe III absorption features in their optical spectra at pre-maximum phases, and have long been suspected to be over-luminous compared to normal Type Ia supernovae. In this paper, the pseudo equivalent width of the Si II $λ$6355 absorption obtained at light curve phases from $\leq+10$ days is combined with the morphology of the $i$-band light curve to identify a sample of 1991T-like supernovae in the Carnegie Supernova Project-II. Hubble diagram residuals show that, at optical as well as near-infrared wavelengths, these events are over-luminous by $\sim$0.1-0.5 mag with respect to the less extreme Branch SS (1999aa-like) and Branch core-normal supernovae with similar $B$-band light curve decline rates.
