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arxiv: 2108.07278 · v1 · pith:K27HUQ3S · submitted 2021-08-16 · astro-ph.SR · astro-ph.GA

SN 2021csp -- the explosion of a stripped envelope star within a H and He-poor circumstellar medium

Morgan Fraser , Maximilian D. Stritzinger , Sean J. Brennan , Andrea Pastorello , Yongzhi Cai , Anthony L. Piro , Chris Ashall , Peter Brown
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Christopher R. Burns Nancy Elias-Rosa Rubina Kotak Alexei V. Filippenko L. Galbany E. Y. Hsiao Saurabh W. Jha Andrea Reguitti Ju-jia Zhang Shane Moran Nidia Morrell B. J. Shappee Lina Tomasella J. P. Anderson Tyler Barna Paolo Ochner M. M. Phillips Michael Tucker Xiaofeng Wang E. Baron Stefano Benetti Melina C. Bersten Thomas G. Brink Yssavo Camacho-Neves Scott Davis Kyle G. Dettman Gaston Folatelli Claudia P. Gutierrez Peter Hoflich Thomas W.-S. Holoien Erkki Kankare Sahana Kumar Jing Lu Paolo Mazzali Stefan Taubenberger Samaporn Tinyanont Hanindyo Kuncarayakti Lindsey Kwok Melissa Shahbandeh Nicholas B. Suntzeff Shengyu Yan Yi Yang WeiKang Zheng
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keywords explosionodotcircumstellardisplayslinesstarstrippedassociate
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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$_\odot$.

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