SN 2017hpa: A Nearby Carbon-rich Type Ia Supernova with a Large Velocity Gradient
文献类型：期刊论文
| 作者 | Zeng,Xiangyun11,12; Wang,Xiaofeng13,14; Esamdin,Ali11; Pellegrino,Craig15,16; Zheng,WeiKang17; Zhang,Jujia18,19,20; Mo,Jun13; Li,Wenxiong1,13; Howell,D. Andrew15,16; Filippenko,Alexei V.3,17 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2021-03-01 |
| 卷号 | 909期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | Supernovae Type Ia supernovae |
| DOI | 10.3847/1538-4357/abdeb9 |
| 英文摘要 | Abstract We present extensive, well-sampled optical and ultraviolet photometry and optical spectra of the Type Ia supernova (SN Ia) 2017hpa. The light curves indicate that SN 2017hpa is a normal SN Ia with an absolute peak magnitude of ?19.12 ± 0.11 mag and a postpeak decline rate Δm 15(B) = 1.02 ± 0.07 mag. According to the quasi-bolometric light curve, we derive a peak luminosity of 1.25 × 1043 erg s?1 and a 56Ni mass of 0.63 ± 0.02 M ⊙. The spectral evolution of SN 2017hpa is similar to that of normal Ia supernovae (SNe Ia), while it exhibits an unusually rapid velocity evolution resembling that of SN 1991bg-like SNe Ia or the high-velocity subclass of SNe Ia, with a postpeak velocity gradient of ～130 ± 7 km s?1 day?1. Moreover, its early spectra (t < ? 7.9 days) show a prominent C ii λ6580 absorption feature, which disappeared in near-maximum-light spectra but reemerged at phases from t ～ + 8.7 days to t ～ + 11.7 days after maximum light. This implies that some unburned carbon may mix deep into the inner layer and is supported by the low C ii λ6580-to-Si ii λ6355 velocity ratio (～0.81) observed in SN 2017hpa. The O i λ7774 line shows a velocity distribution like that of carbon. The prominent carbon feature, the low velocity seen in carbon and oxygen, and the large velocity gradient make SN 2017hpa stand out from other normal SNe Ia and are more consistent with predictions from a violent merger of two white dwarfs. Detailed modeling is still needed to reveal the nature of SN 2017hpa. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-909-2-ABDEB9 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/58072]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.The School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel 2.Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, USA 3.Miller Senior Fellow, Miller Institute for Basic Research in Science, University of California, Berkeley, CA 94720, USA 4.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China 5.George P. and Cynthia Woods Mitchell Institute for Fundamental Physics & Astronomy, Texas A&M University, Department of Physics and Astronomy, 4242 TAMU, College Station, TX 77843, USA 6.Department of Physics, University of California, Davis, CA 95616, USA 7.Department of Chemistry, University of Wisconsin, Madison, WI 53706, USA 8.Department of Physics, University of California, Berkeley, CA 94720-7300, USA 9.Las Cumbres Observatory, 6740 Cortona Drive Suite 102, Goleta, CA 9311-5575, USA 10.Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138-1516, USA |
| 推荐引用方式 GB/T 7714 | Zeng,Xiangyun,Wang,Xiaofeng,Esamdin,Ali,et al. SN 2017hpa: A Nearby Carbon-rich Type Ia Supernova with a Large Velocity Gradient[J]. The Astrophysical Journal,2021,909(2). |
| APA | Zeng,Xiangyun.,Wang,Xiaofeng.,Esamdin,Ali.,Pellegrino,Craig.,Zheng,WeiKang.,...&Zhang,Tianmeng.(2021).SN 2017hpa: A Nearby Carbon-rich Type Ia Supernova with a Large Velocity Gradient.The Astrophysical Journal,909(2). |
| MLA | Zeng,Xiangyun,et al."SN 2017hpa: A Nearby Carbon-rich Type Ia Supernova with a Large Velocity Gradient".The Astrophysical Journal 909.2(2021). |
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来源：国家天文台
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