SN 2021csp -- the explosion of a stripped envelope star within a H and He-poor circumstellar medium
: Fraser Morgan, Stritzinger Maximilian D., Brennan Sean J., Pastorello Andrea, Cai Yongzhi, Piro Anthony L., Ashall Chris, Brown Peter, Burns Christopher R., Elias-Rosa Nancy, Kotak Rubina, Filippenko Alexei V., Galbany L., Hsiao E. Y., Jha Saurabh W., Reguitti Andrea, Zhang Ju-jia, Moran Shane, Morrell Nidia, Shappee B. J., Tomasella Lina, Anderson J. P., Barna Tyler, Ochner Paolo, Phillips M. M., Tucker Michael, Wang Xiaofeng, Baron E., Benetti Stefano, Bersten Melina C., Brink Thomas G., Camacho-Neves Yssavo, Davis Scott, Dettman Kyle G., Folatelli Gaston, Gutierrez Claudia P., Hoflich Peter, Holoien Thomas W. -S., Kankare Erkki, Kumar Sahana, Lu Jing, Mazzali Paolo, Taubenberger Stefan, Tinyanont Samaporn, Kuncarayakti Hanindyo, Kwok Lindsey, Shahbandeh Melissa, Suntzeff Nicholas B., Yan Shengyu, Yang Yi, Zheng WeiKang
Publisher: Arxiv
: 2021
: arXiv.org
: https://arxiv.org/abs/2108.07278
: https://arxiv.org/abs/2108.07278
We 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$_\odot$....
