SN 2021pfs：一项通过与其孪生对应体比较揭示的可能受前身星金属丰度影响的Ia型超新星研究

本文介绍了对位于NGC 5427星系中的Ia型超新星（SNe Ia）SN 2021pfs的广泛光度与光谱观测。研究发现，尽管该超新星与SN 2011fe在演化上高度相似，但其早期光度差异暗示了前身星金属丰度可能存在不同。这一发现对于理解超新星距离测量中的系统不确定性具有重要意义。

arXiv:2608.19929v1 Announce Type: new Abstract: We present extensive photometric and spectroscopic observations of the normal type Ia supernovae (SNe Ia) 2021pfs, which occurred in the Seyfert 2 galaxy NGC 5427 at a redshift 0.009. SN 2021pfs reached an absolute \textit{B}-band peak magnitude of $M_{\rm max}(B)=$-19.28 $\pm$ 0.40 mag. The mag and a post-peak decline rate of $\Delta m_{15}(B)=$1.13 $\pm$ 0.06 mag. The observed properties of this nearby SN Ia closely resemble those of SN 2011fe, including the main optical spectroscopic features and photometric evolution. Despite their similar decline rates, SN 2021pfs rose more rapidly in the $U$ band but more slowly in the $r$ and $i$ bands compared to SN 2011fe in very early phases. This photometric difference, particularly at short wavelengths, can introduce a systematic uncertainty of up to $\sim$12% in distance estimates. Analysis of the host galaxy's local and global environment shows an environment consistent with producing a higher-metallicity progenitor for SN 2021pfs than that of SN 2011fe.This higher progenitor metallicity may explain the observed photometric discrepancy and the resulting distance between SN 2021pfs and SN 2011fe, though a larger sample of such "twin" SNe Ia is needed to confirm this trend and assess its impact on cosmological