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

doi:10.1093/mnrasl/slt138

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 language	English
Pages (from-to)	L51-L55
Number of pages	5
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Volume	437
Issue number	1
Early online date	29 Oct 2013
DOIs	https://doi.org/10.1093/mnrasl/slt138
Publication status	Published - 01 Jan 2014

Keywords

supernovae: general
supernovae: individual: SN2012ca

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10.1093/mnrasl/slt138

SN2012ca: a stripped envelope core-collapse SN interacting with dense circumstellar medium
© 2013 The Authors This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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Inserra, C., Smartt, S. J., Scalzo, R., Fraser, M., Pastorello, A., Childress, M., Pignata, G., Jerkstrand, A., Kotak, R., Benetti, S., Della Valle, M., Gal-Yam, A., Mazzali, P., Smith, K., Sullivan, M., Valenti, S., Yaron, O., Young, D., & Reichart, D. (2014). SN2012ca: a stripped envelope core-collapse SN interacting with dense circumstellar medium. Monthly Notices of the Royal Astronomical Society: Letters, 437(1), L51-L55. https://doi.org/10.1093/mnrasl/slt138

Inserra, C. ; Smartt, S. J. ; Scalzo, R. ; Fraser, M. ; Pastorello, A. ; Childress, M. ; Pignata, G. ; Jerkstrand, A. ; Kotak, R. ; Benetti, S. ; Della Valle, M. ; Gal-Yam, A. ; Mazzali, P. ; Smith, K. ; Sullivan, M. ; Valenti, S. ; Yaron, O. ; Young, D. ; Reichart, D. / SN2012ca: a stripped envelope core-collapse SN interacting with dense circumstellar medium. In: Monthly Notices of the Royal Astronomical Society: Letters. 2014 ; Vol. 437, No. 1. pp. L51-L55.

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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.",

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author = "C. Inserra and Smartt, {S. J.} and R. Scalzo and M. Fraser and A. Pastorello and M. Childress and G. Pignata and A. Jerkstrand and R. Kotak and S. Benetti and {Della Valle}, M. and A. Gal-Yam and P. Mazzali and K. Smith and M. Sullivan and S. Valenti and O. Yaron and D. Young and D. Reichart",

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Inserra, C, Smartt, SJ, Scalzo, R, Fraser, M, Pastorello, A, Childress, M, Pignata, G, Jerkstrand, A, Kotak, R, Benetti, S, Della Valle, M, Gal-Yam, A, Mazzali, P, Smith, K, Sullivan, M, Valenti, S, Yaron, O, Young, D & Reichart, D 2014, 'SN2012ca: a stripped envelope core-collapse SN interacting with dense circumstellar medium', Monthly Notices of the Royal Astronomical Society: Letters, vol. 437, no. 1, pp. L51-L55. https://doi.org/10.1093/mnrasl/slt138

SN2012ca: a stripped envelope core-collapse SN interacting with dense circumstellar medium. / Inserra, C.; Smartt, S. J.; Scalzo, R.; Fraser, M.; Pastorello, A.; Childress, M.; Pignata, G.; Jerkstrand, A.; Kotak, R.; Benetti, S.; Della Valle, M.; Gal-Yam, A.; Mazzali, P.; Smith, K.; Sullivan, M.; Valenti, S.; Yaron, O.; Young, D.; Reichart, D.

In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 437, No. 1, 01.01.2014, p. L51-L55.

Research output: Contribution to journal › Article › peer-review

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AU - Inserra, C.

AU - Smartt, S. J.

AU - Scalzo, R.

AU - Fraser, M.

AU - Pastorello, A.

AU - Childress, M.

AU - Pignata, G.

AU - Jerkstrand, A.

AU - Kotak, R.

AU - Benetti, S.

AU - Della Valle, M.

AU - Gal-Yam, A.

AU - Mazzali, P.

AU - Smith, K.

AU - Sullivan, M.

AU - Valenti, S.

AU - Yaron, O.

AU - Young, D.

AU - Reichart, D.

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N2 - 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.

AB - 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.

KW - supernovae: general

KW - supernovae: individual: SN2012ca

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DO - 10.1093/mnrasl/slt138

M3 - Article

VL - 437

SP - L51-L55

JO - Monthly Notices of the Royal Astronomical Society: Letters, Volume 437, Issue 1, p.L51-L55

JF - Monthly Notices of the Royal Astronomical Society: Letters, Volume 437, Issue 1, p.L51-L55

SN - 1745-3933

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