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arXiv 2103.09937astro-ph.SRastro-ph.HE
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AT2020caa:一个Ia型超新星,有一个先前的爆发或统计侥幸?

AT2020caa: A Type Ia Supernova with a Prior Outburst or a Statistical Fluke?

Monika Soraisam, Thomas Matheson, Chien-Hsiu Lee

摘要:

我们最近发现了一个河外瞬变,AT 2020 caa,使用社区警报代理ANTARES。这一瞬变现象在一年的时间跨度内(2020年至2021年之间)显然表现出两次爆发。基于候选宿主星系长达十年的历史光变曲线,我们排除了星系核的活动来解释这些爆发。测得的峰值幅度(假设候选星系的光谱红移)将AT 2020 caa置于热核超新星(SNe)或发光核心坍缩SNe的范围内。后者中的少数已知显示出先前的爆发(PO),被认为与大质量恒星的质量损失有关。使用Gemini/GMOS,我们获得了当前爆发的光谱,表明它是Ia型超新星(SNIa)。我们研究了AT 2020 caa的PO的性质,并得出结论,它可能是一个单独的SN在同一个星系。

英文摘要:

We recently discovered an extragalactic transient, AT2020caa, using the community alert broker ANTARES. This transient apparently exhibited two outbursts in a time span of a year (between 2020 and 2021). Based on a decade-long historical light curve of the candidate host galaxy, we rule out an activity from the galaxy nucleus to explain these outbursts. The measured peak magnitudes (assuming the known spectroscopic redshift of the candidate host galaxy) put AT2020caa in the realm of thermonuclear supernovae (SNe) or luminous core-collapse SNe. A handful of the latter are known to show prior outbursts (POs), thought to be linked to mass loss in massive stars. Using Gemini/GMOS, we obtained a spectrum of the current outburst that shows it to be a Type Ia supernova (SNIa). We examine the nature of AT2020caa's PO and conclude that it is likely a separate SN within the same galaxy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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