詹姆斯·韦伯空间望远镜（JWST）多历元成像开展的Pandora星系团引力透镜、活动星系核与暂现源探索（PLATE）：II型超新星候选体在z=0.7旋涡星系中的发现
Pandora cluster Lensing, AGN, and Transient Exploration (PLATE) from JWST Multi-Epoch Imaging. I. Discovery of a type II supernova candidate in a spiral galaxy at $z=0.7$
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中文总结 AI 辅助
本研究基于JWST多历元成像的PLATE项目，在阿贝尔2744天区z=0.7的棒旋星系中发现IIP型超新星候选体，证实了JWST多历元观测对宇宙学暂现源的研究能力。
中文摘要 AI 辅助
我们报告在阿贝尔2744天区发现z≈0.7的暂现源PLATE-23a并开展多波段分析，这是Pandora星系团引力透镜、活动星系核与暂现源探索（PLATE）项目的首批成果之一。利用2022至2025年期间的多历元JWST近红外相机（NIRCam）成像，我们在12个滤光片上探测到PLATE-23a，差值成像分析揭示了其上升和下降阶段。PLATE-23a的宿主星系是z=0.688的棒旋星系，恒星质量约为10^10.4 M☉，恒星形成率约为5.1 M☉·年^-1，处于恒星形成主序上。贝叶斯光变曲线分类强烈支持其为IIP型超新星（SN）起源。经引力透镜修正后，该暂现源距离星系中心约13千秒差距，位于恒星形成率较低的区域，表明其前身星可能从遥远的恒星形成团块迁移而来。黑体建模得到的物理性质显示，爆炸后约65天，温度从约8010K降至约6100K；晚期光谱能量分布（SED）与静止帧约1年时进入放射性衰变阶段一致。本工作证明了深度、多历元JWST观测对研究宇宙学距离暂现源的强大能力。
英文摘要
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.
