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Get Free AccessWe present observations of SN 2021csp, a unique supernova (SN) which displays evidence for interaction with H- and He- poor circumstellar material (CSM) at early times. Using high-cadence spectroscopy taken over the first week after explosion, we show that the spectra of SN 2021csp are dominated by C III lines with a velocity of 1800 km s$^{-1}$. We associate this emission with CSM lost by the progenitor prior to explosion. Subsequently, the SN displays narrow He lines before metamorphosing into a broad-lined Type Ic SN. We model the bolometric light curve of SN 2021csp, and show that it is consistent with the energetic ($4\times10^{51}$ erg) explosion of a stripped star, producing 0.4 M$_\odot$ of 56Ni within a $\sim$1 M$_\odot$ shell of CSM extending out to 400 R$_\odot$.
M. Fraser, M. Stritzinger, S. Brennan, A. Pastorello, Yongzhi Cai, Anthony L. Piro, C. Ashall, P. J. Brown, C. R. Burns, N. Elias–Rosa, R. Kotak, Alexei V Filippenko, L. Galbany, E. Y. Hsiao, Saurabh W. Jha, A. Reguitti, Jujia Zhang, S. Moran, N. Morrell, B. J. Shappee, L. Tomasella, J. P. Anderson, Tyler Barna, P. Ochner, M. M. Phillips, M. A. Tucker, Xiaofeng Wang, E. Baron, S. Benetti, Melina C. Bersten, Thomas G. Brink, Yssavo Camacho-Neves, Scott Davis, K. Dettman, G. Folatelli, C. P. Gutiérrez, Peter Höflich, T. W. S. Holoien, E. Kankare, Sahana Kumar, Jing Lü, Paolo Mazzali, S. Taubenberger, Samaporn Tinyanont, H. Kuncarayakti, Lindsey A. Kwok, Melissa Shahbandeh, N. B. Suntzeff, Shengyu Yan, Yi Yang, WeiKang Zheng (2021). SN 2021csp -- the explosion of a stripped envelope star within a H and He-poor circumstellar medium. , DOI: https://doi.org/10.48550/arxiv.2108.07278.
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Type
Preprint
Year
2021
Authors
51
Datasets
0
Total Files
0
Language
en
DOI
https://doi.org/10.48550/arxiv.2108.07278
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