{"title":"SN Ia CSM 2020aeuh: A Massive Binary C/O White Dwarf Merger?","authors":"N. N. Chugai","doi":"10.1134/S1063773725700458","DOIUrl":null,"url":null,"abstract":"<p>The origin of the circumstellar (CS) shell of the unusual SN Ia 2020aeuh is explored using a light curve model and observational constraints. The synthesized <span>\\({}^{56}\\)</span>Ni mass (<span>\\({\\approx}1\\)</span>\n <span>\\(M_{\\odot}\\)</span>), the mass of the CS shell (0.04–0.2 <span>\\(M_{\\odot}\\)</span>), the radius (<span>\\(2\\times 10^{16}\\)</span> cm), and its expansion velocity (<span>\\({\\lesssim}200\\)</span> km s<span>\\({}^{-1}\\)</span>) have been estimated. The large <span>\\({}^{56}\\)</span>Ni mass and the properties of the CS shell are consistent with the scenario of a massive binary C/O white dwarf merger that was accompanied by the loss of <span>\\({\\sim}0.1\\)</span>\n <span>\\(M_{\\odot}\\)</span> of matter. The supernova is shown to have exploded <span>\\({\\gtrsim}30\\)</span> years after the white dwarf merger.</p>","PeriodicalId":55443,"journal":{"name":"Astronomy Letters-A Journal of Astronomy and Space Astrophysics","volume":"51 5","pages":"257 - 261"},"PeriodicalIF":0.9000,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Astronomy Letters-A Journal of Astronomy and Space Astrophysics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S1063773725700458","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
The origin of the circumstellar (CS) shell of the unusual SN Ia 2020aeuh is explored using a light curve model and observational constraints. The synthesized \({}^{56}\)Ni mass (\({\approx}1\)\(M_{\odot}\)), the mass of the CS shell (0.04–0.2 \(M_{\odot}\)), the radius (\(2\times 10^{16}\) cm), and its expansion velocity (\({\lesssim}200\) km s\({}^{-1}\)) have been estimated. The large \({}^{56}\)Ni mass and the properties of the CS shell are consistent with the scenario of a massive binary C/O white dwarf merger that was accompanied by the loss of \({\sim}0.1\)\(M_{\odot}\) of matter. The supernova is shown to have exploded \({\gtrsim}30\) years after the white dwarf merger.
利用光曲线模型和观测约束探讨了不寻常的SN Ia 2020aeuh的星周壳的起源。计算出了合成的\({}^{56}\) Ni质量（\({\approx}1\)\(M_{\odot}\)）、CS壳层质量（0.04-0.2 \(M_{\odot}\)）、半径（\(2\times 10^{16}\) cm）和膨胀速度（\({\lesssim}200\) km s \({}^{-1}\)）。巨大的\({}^{56}\) Ni质量和CS壳层的性质与巨大的C/O二元白矮星合并的情景一致，伴随着\({\sim}0.1\)\(M_{\odot}\)物质的损失。这颗超新星在白矮星合并后\({\gtrsim}30\)年爆炸。
期刊介绍：
Astronomy Letters is an international peer reviewed journal that publishes the results of original research on all aspects of modern astronomy and astrophysics including high energy astrophysics, cosmology, space astronomy, theoretical astrophysics, radio astronomy, extragalactic astronomy, stellar astronomy, and investigation of the Solar system.
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