SN2012ca: a stripped envelope core-collapse SN interacting with dense circumstellar medium

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 SN2012ca with the Public ESO Spectroscopy Survey of Transient Objects (PESSTO), spread over one year since discovery. The supernova (SN) bears many similarities to SN1997cy 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 that two channels (both thermonuclear and stripped envelope core-collapse) may be responsible for these SN 1997cy-like events.
Original languageEnglish
Pages (from-to)L51-L55
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume437
Issue number1
Early online date29 Oct 2013
DOIs
Publication statusPublished - 01 Jan 2014

Keywords

  • supernovae: general
  • supernovae: individual: SN2012ca

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