1991T-like超新星的绝对星等
高能天体物理现象
2022-10-26 v1 太阳与恒星天体物理
摘要
1991T-like超新星是Branch浅硅（SS）型Ia超新星子类中的明亮、缓慢衰减极端类型。它们在极大前阶段的光学光谱中以极弱的Ca II H&K和Si II 以及强Fe III吸收特征为区别，且长期以来被怀疑比正常Ia超新星光度更高。本文中，将光变曲线相位天处获得的Si II 6355吸收 pseudo等效宽度与波段光变曲线形态结合，在Carnegie超新星项目-II中甄别出一组1991T-like超新星样本。Hubble图残差显示，在光学及近红外波长处，这些事件比具有相似波段光变曲线衰减率的较不极端的Branch SS（1999aa-like）和Branch核心正常超新星光度高出0.1-0.5 mag。
引用
@article{arxiv.2209.08031,
title = {The Absolute Magnitudes of 1991T-like Supernovae},
author = {M. M. Phillips and C. Ashall and Christopher R. Burns and Carlos Contreras and L. Galbany and P. Hoeflich and E. Y. Hsiao and Nidia Morrell and Peter Nugent and Syed A. Uddin and E. Baron and Wendy L. Freedman and Chelsea E. Harris and Kevin Krisciunas and S. Kumar and J. Lu and S. E. Persson and Anthony L. Piro and Abigail Polin and Shahbandeh and M. and Maximilian Stritzinger and Nicholas B. Suntzeff},
journal= {arXiv preprint arXiv:2209.08031},
year = {2022}
}
备注
Submitted to ApJ (Aug 30, 2022)