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Astrophysics > Solar and Stellar Astrophysics

arXiv:1307.1791 (astro-ph)
[Submitted on 6 Jul 2013 (v1), last revised 3 Oct 2013 (this version, v2)]

Title:SN 2012ca: a stripped envelope core-collapse SN interacting with dense circumstellar medium

Authors:C. Inserra, S. J. Smartt, R. Scalzo, M. Fraser, A. Pastorello, M. Childress, G. Pignata, A. Jerkstrand, R. Kotak, S. Benetti, M. Della Valle, A. Gal-Yam, P. Mazzali, K. Smith, M. Sullivan, S. Valenti, O. Yaron, D. Young, D. Reichart
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Abstract:We report optical and near-infrared observations of SN 2012ca with the Public ESO Spectroscopy Survey of Transient Objects (PESSTO), spread over one year since discovery. The supernova (SN) bears many similarities to SN 1997cy and to other events classified as Type IIn but which have been suggested to have a thermonuclear origin with narrow hydrogen lines produced when the ejecta impact a hydrogen-rich circumstellar medium (CSM). Our analysis, especially in the nebular phase, reveals the presence of oxygen, magnesium and carbon features. This suggests a core collapse explanation for SN2012ca, in contrast to the thermonuclear interpretation proposed for some members of this group. We suggest that the data can be explained with a hydrogen and helium deficient SN ejecta (Type I) interacting with a hydrogen-rich CSM, but that the explosion was more likely a Type Ic core-collapse explosion than a Type Ia thermonuclear one. This suggests two channels (both thermonuclear and stripped envelope core-collapse) may be responsible for these SN 1997cy-like events.
Comments: 5 pages, 4 figures, accepted in MNRAS Letter
Subjects: Solar and Stellar Astrophysics (astro-ph.SR); Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cite as: arXiv:1307.1791 [astro-ph.SR]
  (or arXiv:1307.1791v2 [astro-ph.SR] for this version)
  https://doi.org/10.48550/arXiv.1307.1791
Related DOI: https://doi.org/10.1093/mnrasl/slt138

Submission history

From: Cosimo Inserra Cosimo Inserra [view email]
[v1] Sat, 6 Jul 2013 15:18:05 UTC (300 KB)
[v2] Thu, 3 Oct 2013 00:09:35 UTC (326 KB)
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