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 $z=0.7$

Yuxuan Pang; Xin Wang; Ping Chen; Subo Dong; Hang Zhou; Shengzhe Wang; Qianqiao Zhou; Xunda Sun; Jifeng Liu; Hu Zhan; Karl Glazebrook; Ivo Labbé; Themiya Nanayakkara; David A. Coulter; Justin D. R. Pierel; Armin Rest; Jujia Zhang

arXiv · 2608.20781

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 $z=0.7$

Yuxuan Pang·Xin Wang·Ping Chen·Subo Dong·Hang Zhou·Shengzhe Wang·Qianqiao Zhou·Xunda Sun·Jifeng Liu·Hu Zhan·Karl Glazebrook·Ivo Labbé·Themiya Nanayakkara·David A. Coulter·Justin D. R. Pierel·Armin Rest·Jujia Zhang

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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.

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Yuxuan Pang, Xin Wang, Ping Chen, Subo Dong, Hang Zhou, Shengzhe Wang, Qianqiao Zhou, Xunda Sun, Jifeng Liu, Hu Zhan, Karl Glazebrook, Ivo Labbé, Themiya Nanayakkara, David A. Coulter, Justin D. R. Pierel, Armin Rest, Jujia Zhang. 2026-08-21. 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 $z=0.7$. https://arxiv.org/abs/2608.20781

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