基于韦布空间望远镜（JWST）多历元成像的Pandora星系团引力透镜、活动星系核与暂现源探测（PLATE）。I. 在z=0.7的旋涡星系中发现一颗II型超新星候选体

本文报告了PLATE项目在Abell 2744视场中发现的暂现源PLATE-23a，并利用韦布空间望远镜（JWST）的多历元成像数据对其进行了多波段分析。分析表明该暂现源位于一个红移为0.688的旋涡星系中，其光变特征与IIP型超新星（SN）相符。这项研究展示了利用深场多历元观测研究宇宙学距离下暂现源的强大能力。

arXiv:2608.20781v1 Announce Type: new Abstract: We report the discovery and multi-wavelength analysis of a $z\sim0.7$ transient PLATE-23a in the Abell 2744 field, as the first results of the Pandora Lensing, AGN, and Transient Exploration (PLATE) project. Using multi-epoch JWST NIRCam imaging spanning from 2022 to 2025, we detect PLATE-23a in 12 filters. Difference-imaging analysis reveals its rising and declining phases. The host galaxy of PLATE-23a is a barred spiral at $z=0.688$ with a stellar mass of $\sim 10^{10.4}M_{\odot}$ and a star formation rate of $\sim5.1M_{\odot}~\rm yr^{-1}$, placing it on the star-forming main sequence. Bayesian light-curve classification strongly favors a type IIP supernova (SN) origin. It lies $\sim 13\rm kpc$ (after lensing correction) from the galaxy center in a region of low local star formation, suggesting the progenitor may have migrated from a distant star-forming clump. Physical properties derived from blackbody modeling indicate a temperature decreasing from $\sim8010\rm K$ to $\sim6100\rm K$ at around 65 days after the explosion; the late-time SED is consistent with entering the radioactive decay phase at about one rest-frame year. This work demonstrates the power of deep, multi-epoch JWST observations for studying transients at cosmological distances.