The Peculiar Transient AT2018cow: A Possible Origin of a Type Ibn/IIn Supernova
文献类型：期刊论文
| 作者 | Xiang,Danfeng2; Wang,Xiaofeng2,3,4; Lin,Weili2; Mo,Jun2; Lin,Han2; Burke,Jamison5,6; Hiramatsu,Daichi5,6; Hosseinzadeh,Griffin7; Howell,D. Andrew5,6; McCully,Curtis5,6 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2021-03-01 |
| 卷号 | 910期号:1 |
| 关键词 | Supernovae Circumstellar matter Massive stars Binary stars Magnetars Time domain astronomy Optical observation |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/abdeba |
| 英文摘要 | Abstract We present our photometric and spectroscopic observations of the peculiar transient AT2018cow. The multiband photometry covers from peak to ～70 days, and the spectroscopy ranges from 5 to ～50 days. The rapid rise (t r ? 2.9 days), high luminosity (M V,peak ～ ?20.8 mag), and fast decline after peak make AT2018cow stand out from any other optical transients, whereas we find that its light curves show a high resemblance to those of Type Ibn supernovae. Moreover, the spectral energy distribution remains at a high temperature of ～14,000 K at t > 15 days after discovery. The spectra are featureless in the first 10 days, while some broad emission lines due to H, He, C, and O emerge later, with velocity declining from ～14,000 to ～3000 km s?1 at the end of our observations. Narrow and weak He I emission lines emerge in the spectra at t > 20 days after discovery. These emission lines are reminiscent of the features seen in interacting supernovae like the Type Ibn and IIn subclasses. We fit the bolometric light curves with a model of circumstellar interaction and radioactive decay of 56Ni and find a good fit with ejecta mass M ej ～ 3.16 M ⊙, circumstellar medium (CSM) mass M CSM ～ 0.04 M ⊙, and ejected 56Ni mass M ⊙. The CSM shell might be formed in an eruptive mass ejection of the progenitor star. Furthermore, the host environment of AT2018cow implies a connection of AT2018cow with massive stars. Combining observational properties and the light-curve fitting results, we conclude that AT2018cow might be a peculiar interacting supernova that originated from a massive star. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-910-1-ABDEBA |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/58081]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Ulugh Beg Astronomical Institute, Uzbekistan Academy of Sciences, Uzbekistan, Tashkent 100052, Uzbekistan 2.Physics Department and Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing 100084, People's Republic of China wang_xf@mail.tsinghua.edu.cn 3.Beijing Planetarium, Beijing Academy of Sciences and Technology, Beijing 100044, People's Republic of China 4.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023, People's Republic of China 5.Las Cumbres Observatory, 6740 Cortona Drive, Suite 102, Goleta, CA 93117-5575, USA 6.Department of Physics, University of California, Santa Barbara, CA 93106-9530, USA 7.Center for Astrophysics∣Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138-1516, USA 8.Department of Physics and Astronomy, University of California, 1 Shields Avenue, Davis, CA 95616-5270, USA 9.Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Konkoly-Thege M. út 15-17, Budapest 1121, Hungary 10.ELTE E?tv?s Loránd University, Institute of Physics, Pázmany Péter sétány 1/A, Budapest 1117, Hungary |
| 推荐引用方式 GB/T 7714 | Xiang,Danfeng,Wang,Xiaofeng,Lin,Weili,et al. The Peculiar Transient AT2018cow: A Possible Origin of a Type Ibn/IIn Supernova[J]. The Astrophysical Journal,2021,910(1). |
| APA | Xiang,Danfeng.,Wang,Xiaofeng.,Lin,Weili.,Mo,Jun.,Lin,Han.,...&Li,Wenxiong.(2021).The Peculiar Transient AT2018cow: A Possible Origin of a Type Ibn/IIn Supernova.The Astrophysical Journal,910(1). |
| MLA | Xiang,Danfeng,et al."The Peculiar Transient AT2018cow: A Possible Origin of a Type Ibn/IIn Supernova".The Astrophysical Journal 910.1(2021). |
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