Discovery of the Closest Ultra-stripped Supernova: SN 2021agco in UGC 3855
文献类型：期刊论文
| 作者 | Yan, Shengyu11,12; Wang, Xiaofeng10,11,12; Gao, Xing9; Zhang, Jujia6,7,8; Filippenko, Alexei V.5; Brink, Thomas G.5; Mo, Jun11,12; Lin, Weili11,12; Xiang, Danfeng11,12; Ma, Xiaoran11,12 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2023-12-01 |
| 卷号 | 959期号:2页码:L32 |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/ad0cc3 |
| 产权排序 | 3 |
| 英文摘要 | We present the discovery and studies of the helium-rich, fast-evolving supernova (SN) 2021agco at a distance of similar to 40 Mpc. Its early-time flux is found to rise from half peak to the peak of -16.06 +/- 0.42 mag in the r band within 2.4-1.0+1.5 days, and the post-peak light curves also decline at a much faster pace relative to normal stripped-envelope supernovae (SNe) of Type Ib/Ic. The early-time spectrum of SN 2021agco (t approximate to 1.0 days after the peak) is characterized by a featureless blue continuum superimposed with a weak emission line of ionized C iii, and the subsequent spectra show prominent He i lines. Both the photometric and spectroscopic evolution show close resemblances to SN 2019dge, which is believed to have an extremely stripped progenitor. We reproduce the multicolor light curves of SN 2021agco with a model combining shock-cooling emission with 56Ni decay. The best-fit results give an ejecta mass of approximate to 0.3 M circle dot and a synthesized nickel mass of approximate to 2.2 x 10-2 M circle dot. The progenitor is estimated to have an envelope radius of R env approximate to 80 R circle dot and a mass of M env approximate to 0.10 M circle dot. All these suggest that SN 2021agco can be categorized as an ultra-stripped SN Ib, representing the closest object of this rare subtype. This SN is found to explode in the disk of a Sab-type galaxy with an age of similar to 10.0 Gyr and low star-forming activity. Compared to normal SNe Ib/c, the host galaxies of SN 2021agco and other ultra-stripped SNe tend to have relatively lower metallicity, which complicates the properties of their progenitor populations. |
| WOS关键词 | CORE-COLLAPSE SUPERNOVA ; 21-CM LINE MEASUREMENTS ; BLUE OPTICAL TRANSIENT ; LIGHT CURVES ; IB/C SUPERNOVAE ; POSSIBLE ORIGIN ; RICH TRANSIENT ; LOCAL UNIVERSE ; IIB SUPERNOVA ; IC SUPERNOVAE |
| 资助项目 | MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809 ; Open Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; Chinese Academy of Sciences ; People's Government of Yunnan Province ; Center for Astronomical Mega-Science, CAS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001131973900001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809 ; Open Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; Chinese Academy of Sciences ; People's Government of Yunnan Province ; Center for Astronomical Mega-Science, CAS |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/5690]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Wang, Xiaofeng |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China 2.INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy 3.Chinese Acad Sci, Key Lab Space Astron & Technol, Natl Astron Observ, 20A Datun Rd, Beijing 100101, Peoples R China 4.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 101408, Peoples R China 5.Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA 6.Yunnan Key Lab, Int Ctr Supernovae, Kunming 650216, Peoples R China 7.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650216, Peoples R China 8.Chinese Acad Sci, Yunnan Observ, Kunming 260216, Peoples R China 9.Xinjiang Astron Observ, Urumqi 830011, Peoples R China 10.Beijing Acad Sci & Technol, Beijing Planetarium, Beijing 100044, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yan, Shengyu,Wang, Xiaofeng,Gao, Xing,et al. Discovery of the Closest Ultra-stripped Supernova: SN 2021agco in UGC 3855[J]. ASTROPHYSICAL JOURNAL LETTERS,2023,959(2):L32. |
| APA | Yan, Shengyu.,Wang, Xiaofeng.,Gao, Xing.,Zhang, Jujia.,Filippenko, Alexei V..,...&Zhang, Tianmeng.(2023).Discovery of the Closest Ultra-stripped Supernova: SN 2021agco in UGC 3855.ASTROPHYSICAL JOURNAL LETTERS,959(2),L32. |
| MLA | Yan, Shengyu,et al."Discovery of the Closest Ultra-stripped Supernova: SN 2021agco in UGC 3855".ASTROPHYSICAL JOURNAL LETTERS 959.2(2023):L32. |
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