TY - JOUR
T1 - SN2012ca
T2 - A stripped envelope core-collapse SN interacting with dense circumstellar medium
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, Valle, M.
AU - Gal-Yam, Avishay
AU - Mazzali, P.
AU - Smith, K.
AU - Sullivan, M.
AU - Valenti, S.
AU - Yaron, Ofer
AU - Young, D.
AU - Reichart, D.
N1 - European Research Council under the European Union's Seventh Framework Programme [291222]; PRIN-INAF; Millennium Center for Supernova Science [P10-064-F]Based on observations collected by PESSTO, and the Panchromatic Robotic Optical Monitoring and Polarimetry Telescope (PROMPT), Chile; the Australian National University 2.3 m Telescope and the Swift satellite. Funded by the European Research Council under the European Union's Seventh Framework Programme (FP7/20072013)/ERC Grant agreement no. [291222] (SJS). SB and AP acknowledge the PRIN-INAF 2011 project 'Transient Universe: from ESO Large to PESSTO'. GP acknowledges Millennium Center for Supernova Science (P10-064-F).
PY - 2013/12
Y1 - 2013/12
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
UR - https://www.scopus.com/pages/publications/84890144192
U2 - 10.1093/mnrasl/slt138
DO - 10.1093/mnrasl/slt138
M3 - مقالة
SN - 1745-3925
VL - 437
SP - L51-L55
JO - Monthly Notices of the Royal Astronomical Society: Letters
JF - Monthly Notices of the Royal Astronomical Society: Letters
IS - 1
M1 - slt138
ER -