Discovery of a Variable Yellow Supergiant Progenitor for the Type IIb SN 2024abfo

Zexi Niu, 泽茜 牛, Ning-Chen Sun, Justyn R. Maund, Zhen Guo, Wenxiong Li, Meng Sun, 萌 孙 and Jifeng Liu
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Abstract

We report the discovery of a progenitor candidate for the Type IIb SN 2024abfo using multiepoch pre-explosion images from the Hubble Space Telescope and the Dark Energy Camera Legacy Survey. The progenitor exhibited a ∼0.7 mag decline in F814W from 2001 to 2013, followed by significant brightening and color fluctuations in the g, r, and z bands. This is the first time that substantial photometric variability has been found for the progenitor of a SN IIb. We suggest that the variability is caused by intrinsic changes in the progenitor star instead of varying obscuration by circumstellar dust. Our results show that the progenitor of SN 2024abfo was likely a yellow supergiant star with an initial mass of 12–18 M⊙ for circumstellar reddening of E(B − V)CSM < 0.2 mag. Our study underscores the critical role of multiepoch imaging surveys in revealing the final stages of core-collapse supernovae progenitors.
发现IIb型超新星SN 2024abfo的可变黄色超巨星祖星
我们报告使用哈勃太空望远镜和暗能量相机遗产调查的多时期爆炸前图像发现了IIb型SN 2024abfo的候选祖先。从2001年到2013年,F814W的祖星亮度下降了0.7等,随后在g、r和z波段出现了明显的亮度和颜色波动。这是第一次在SN IIb的祖先中发现大量的光度变化。我们认为这种变化是由原始恒星的内在变化引起的,而不是由星周尘埃的不同遮挡引起的。我们的研究结果表明,SN 2024abfo的祖先可能是一颗初始质量为12-18 M⊙的黄色超巨星,对于E(B−V)CSM < 0.2等的星周变红。我们的研究强调了多时期成像调查在揭示核心坍缩超新星祖先的最后阶段的关键作用。
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