A spectral data release for 104 Type II Supernovae from the Tsinghua Supernova Group
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2024
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| author | Lin, Han Wang, Xiaofeng Zhang, Jujia Xiang, Danfeng Zhang, Tianmeng Zhao, Xulin Zhang, Xinghan Sai, Hanna Rui, Liming Mo, Jun Xi, Gaobo Huang, Fang Li, Xue Cai, Yongzhi Lin, Weili Lin, Jie Wu, Chengyuan Zhang, Jicheng Chen, Zhihao Li, Zhitong Li, Wenxiong Li, Linyi Zhang, Kaicheng Miao, Cheng Chen, Juncheng Fan, Zhou Fu, Jianning Qian, Shengbang Wu, Hong Wu, Xue-Bing Yan, Jingzhi Zhang, Huawei Zhang, Junbo Zhang, Liyun Zheng, Jie Zhai, Qian |
| author_facet | Lin, Han Wang, Xiaofeng Zhang, Jujia Xiang, Danfeng Zhang, Tianmeng Zhao, Xulin Zhang, Xinghan Sai, Hanna Rui, Liming Mo, Jun Xi, Gaobo Huang, Fang Li, Xue Cai, Yongzhi Lin, Weili Lin, Jie Wu, Chengyuan Zhang, Jicheng Chen, Zhihao Li, Zhitong Li, Wenxiong Li, Linyi Zhang, Kaicheng Miao, Cheng Chen, Juncheng Fan, Zhou Fu, Jianning Qian, Shengbang Wu, Hong Wu, Xue-Bing Yan, Jingzhi Zhang, Huawei Zhang, Junbo Zhang, Liyun Zheng, Jie Zhai, Qian |
| contents | We present 206 unpublished optical spectra of 104 type II supernovae obtained by the Xinglong 2.16m telescope and Lijiang 2.4m telescope during the period from 2011 to 2018, spanning the phases from about 1 to 200 days after the SN explosion. The spectral line identifications, evolution of line velocities and pseudo equivalent widths, as well as correlations between some important spectral parameters are presented. Our sample displays a large range in expansion velocities. For instance, the Fe~{\sc ii} $5169$ velocities measured from spectra at $t\sim 50$ days after the explosion vary from ${\rm 2000\ km\ s^{-1}}$ to ${\rm 5500\ km\ s^{-1}}$, with an average value of ${\rm 3872 \pm 949\ km\ s^{-1}}$. Power-law functions can be used to fit the velocity evolution, with the power-law exponent quantifying the velocity decline rate. We found an anticorrelation existing between H$β$ velocity at mid-plateau phase and its velocity decay exponent, SNe II with higher velocities tending to have smaller velocity decay rate. Moreover, we noticed that the velocity decay rate inferred from the Balmer lines (i.e., H$α$ and H$β$) have moderate correlations with the ratio of absorption to emission for H$α$ (a/e). In our sample, two objects show possibly flash-ionized features at early phases. Besides, we noticed that multiple high-velocity components may exist on the blue side of hydrogen lines of SN 2013ab, possibly suggesting that these features arise from complex line forming region. All our spectra can be found in WISeREP and Zenodo. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_05889 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A spectral data release for 104 Type II Supernovae from the Tsinghua Supernova Group Lin, Han Wang, Xiaofeng Zhang, Jujia Xiang, Danfeng Zhang, Tianmeng Zhao, Xulin Zhang, Xinghan Sai, Hanna Rui, Liming Mo, Jun Xi, Gaobo Huang, Fang Li, Xue Cai, Yongzhi Lin, Weili Lin, Jie Wu, Chengyuan Zhang, Jicheng Chen, Zhihao Li, Zhitong Li, Wenxiong Li, Linyi Zhang, Kaicheng Miao, Cheng Chen, Juncheng Fan, Zhou Fu, Jianning Qian, Shengbang Wu, Hong Wu, Xue-Bing Yan, Jingzhi Zhang, Huawei Zhang, Junbo Zhang, Liyun Zheng, Jie Zhai, Qian High Energy Astrophysical Phenomena We present 206 unpublished optical spectra of 104 type II supernovae obtained by the Xinglong 2.16m telescope and Lijiang 2.4m telescope during the period from 2011 to 2018, spanning the phases from about 1 to 200 days after the SN explosion. The spectral line identifications, evolution of line velocities and pseudo equivalent widths, as well as correlations between some important spectral parameters are presented. Our sample displays a large range in expansion velocities. For instance, the Fe~{\sc ii} $5169$ velocities measured from spectra at $t\sim 50$ days after the explosion vary from ${\rm 2000\ km\ s^{-1}}$ to ${\rm 5500\ km\ s^{-1}}$, with an average value of ${\rm 3872 \pm 949\ km\ s^{-1}}$. Power-law functions can be used to fit the velocity evolution, with the power-law exponent quantifying the velocity decline rate. We found an anticorrelation existing between H$β$ velocity at mid-plateau phase and its velocity decay exponent, SNe II with higher velocities tending to have smaller velocity decay rate. Moreover, we noticed that the velocity decay rate inferred from the Balmer lines (i.e., H$α$ and H$β$) have moderate correlations with the ratio of absorption to emission for H$α$ (a/e). In our sample, two objects show possibly flash-ionized features at early phases. Besides, we noticed that multiple high-velocity components may exist on the blue side of hydrogen lines of SN 2013ab, possibly suggesting that these features arise from complex line forming region. All our spectra can be found in WISeREP and Zenodo. |
| title | A spectral data release for 104 Type II Supernovae from the Tsinghua Supernova Group |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2401.05889 |