Spectral Dataset of Stripped-Envelope Supernovae from the Tsinghua Supernova Group
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arXiv
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| Format: | Preprint |
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2026
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| author | Xiang, Danfeng Wang, Xiaofeng Zhang, Jujia Yan, Shengyu Lin, Han Rui, Liming Mo, Jun Zhang, Xinghan Sai, Hanna Miao, Cheng Xi, Gaobo Chen, Zhihao Guo, Fangzhou Ma, Xiaoran Li, Gaici Zhang, Tianmeng Chen, Liyang Liu, Jialian Li, Wenxiong Zhao, Xulin Huang, Fang Cai, Yongzhi Lin, Weili Lin, Jie Wu, Chengyuan Hu, Maokai Song, Cuiying Zhang, Jicheng Xia, Qiqi Li, Zhitong Li, Linyi Zhang, Kaicheng Zhai, Qian Chen, Juncheng Fan, Zhou Fu, Jianning Qian, Shengbang Wu, Hong Wu, Xue-Bing Zhang, Huawei Zhang, Junbo Zhang, Liyun Zheng, Jie |
| author_facet | Xiang, Danfeng Wang, Xiaofeng Zhang, Jujia Yan, Shengyu Lin, Han Rui, Liming Mo, Jun Zhang, Xinghan Sai, Hanna Miao, Cheng Xi, Gaobo Chen, Zhihao Guo, Fangzhou Ma, Xiaoran Li, Gaici Zhang, Tianmeng Chen, Liyang Liu, Jialian Li, Wenxiong Zhao, Xulin Huang, Fang Cai, Yongzhi Lin, Weili Lin, Jie Wu, Chengyuan Hu, Maokai Song, Cuiying Zhang, Jicheng Xia, Qiqi Li, Zhitong Li, Linyi Zhang, Kaicheng Zhai, Qian Chen, Juncheng Fan, Zhou Fu, Jianning Qian, Shengbang Wu, Hong Wu, Xue-Bing Zhang, Huawei Zhang, Junbo Zhang, Liyun Zheng, Jie |
| contents | The extent of envelope stripping in the progenitor stars is directly reflected in the diversity of spectral features observed in stripped-envelope supernovae (SESNe). Through extensive spectral observation and analysis, we aim to clarify the statistical differences between the subclasses of SESNe. The Tsinghua Supernova group obtained 249 optical spectra of 62 SESNe during the years from 2010 to 2020, covering phases from $-$16 to over 190 days relative to maximum light. Most spectra were obtained during the photospheric phases after the supernova explosion. For each spectrum, the pseudo-equivalent widths (pEWs) and blueshift velocities of principal lines were measured. We further investigated the common spectral features by analysing their velocity and strength correlations across all subtypes. We identify the feature near 6200~Å in SNe Ib as H$\mathrmα$ through comparison with SNe IIb and Ic, which resolves inconsistent literature interpretations. Our finding reveals prevalent residual hydrogen in SNe Ib, further supporting a continuous stripping sequence from SNe IIb to Ib. We observe a trend in increasing velocity among different subtypes of stripped-envelope SNe, with SNe IIb exhibiting the lowest line velocities, followed by Ib, Ic, and Ic-BL. Typically, the O~I lines in SNe Ic/Ic-BL are stronger than those seen in SNe IIb/Ib. In nebular phases, the [Ca II] emission dominates over [O I] in SNe IIb/Ib while [O I] is stronger in SNe Ic, including the He-rich SN 2016coi. This spectral dichotomy implies that progenitors of SNe Ic (BL) have more massive CO cores and hence higher initial masses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_12604 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spectral Dataset of Stripped-Envelope Supernovae from the Tsinghua Supernova Group Xiang, Danfeng Wang, Xiaofeng Zhang, Jujia Yan, Shengyu Lin, Han Rui, Liming Mo, Jun Zhang, Xinghan Sai, Hanna Miao, Cheng Xi, Gaobo Chen, Zhihao Guo, Fangzhou Ma, Xiaoran Li, Gaici Zhang, Tianmeng Chen, Liyang Liu, Jialian Li, Wenxiong Zhao, Xulin Huang, Fang Cai, Yongzhi Lin, Weili Lin, Jie Wu, Chengyuan Hu, Maokai Song, Cuiying Zhang, Jicheng Xia, Qiqi Li, Zhitong Li, Linyi Zhang, Kaicheng Zhai, Qian Chen, Juncheng Fan, Zhou Fu, Jianning Qian, Shengbang Wu, Hong Wu, Xue-Bing Zhang, Huawei Zhang, Junbo Zhang, Liyun Zheng, Jie High Energy Astrophysical Phenomena Solar and Stellar Astrophysics The extent of envelope stripping in the progenitor stars is directly reflected in the diversity of spectral features observed in stripped-envelope supernovae (SESNe). Through extensive spectral observation and analysis, we aim to clarify the statistical differences between the subclasses of SESNe. The Tsinghua Supernova group obtained 249 optical spectra of 62 SESNe during the years from 2010 to 2020, covering phases from $-$16 to over 190 days relative to maximum light. Most spectra were obtained during the photospheric phases after the supernova explosion. For each spectrum, the pseudo-equivalent widths (pEWs) and blueshift velocities of principal lines were measured. We further investigated the common spectral features by analysing their velocity and strength correlations across all subtypes. We identify the feature near 6200~Å in SNe Ib as H$\mathrmα$ through comparison with SNe IIb and Ic, which resolves inconsistent literature interpretations. Our finding reveals prevalent residual hydrogen in SNe Ib, further supporting a continuous stripping sequence from SNe IIb to Ib. We observe a trend in increasing velocity among different subtypes of stripped-envelope SNe, with SNe IIb exhibiting the lowest line velocities, followed by Ib, Ic, and Ic-BL. Typically, the O~I lines in SNe Ic/Ic-BL are stronger than those seen in SNe IIb/Ib. In nebular phases, the [Ca II] emission dominates over [O I] in SNe IIb/Ib while [O I] is stronger in SNe Ic, including the He-rich SN 2016coi. This spectral dichotomy implies that progenitors of SNe Ic (BL) have more massive CO cores and hence higher initial masses. |
| title | Spectral Dataset of Stripped-Envelope Supernovae from the Tsinghua Supernova Group |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2603.12604 |