Optical And Near-infrared Observations Of Sn 2014ck: An Outlier Among The Type Iax Supernovae

Tomasella, L.; Cappellaro, E.; Benetti, S.; Pastorello, A.; Hsiao, E. Y.; Sand, D. J.; Stritzinger, M.; Valenti, S.; McCully, C.; Arcavi, I.; Elias-Rosa, N.; Harmanen, J.; Harutyunyan, A.; Hosseinzadeh, G.; Howell, D. A.; Kankare, E.; Morales-Garoffolo, A.; Taddia, F.; Tartaglia, L.; Terreran, G.; Turatto, M.

Tomasella, L., Cappellaro, E., Benetti, S., Pastorello, A., Hsiao, E. Y., Sand, D. J., … Turatto, M. (2016). Optical And Near-infrared Observations Of Sn 2014ck: An Outlier Among The Type Iax Supernovae. Monthly Notices Of The Royal Astronomical Society. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000376386600076

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Optical And Near-infrared Observations Of Sn 2014ck: An Outlier Among The Type Iax Supernovae

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Date Issued

2016-06-11

Abstract

We present a comprehensive set of optical and near-infrared (NIR) photometric and spectroscopic observations for SN 2014ck, extending from pre-maximum to six months later. These data indicate that SN 2014ck is photometrically nearly identical to SN 2002cx, which is the prototype of the class of peculiar transients named SNe Iax. Similar to SN 2002cx, SN 2014ck reached a peak brightness M-B = -17.37 +/- 0.15 mag, with a post-maximum decline rate Delta m(15)(B) = 1.76 +/- 0.15 mag. However, the spectroscopic sequence shows similarities with SN 2008ha, which was three magnitudes fainter and faster declining. In particular, SN 2014ck exhibits extremely low ejecta velocities, similar to 3000 km s(-1) at maximum, which are close to the value measured for SN 2008ha and half the value inferred for SN 2002cx. The bolometric light curve of SN 2014ck is consistent with the production of 0.10(-0.03)(+0.04) M-circle dot of Ni-56. The spectral identification of several iron-peak features, in particular Co II lines in the NIR, provides a clear link to SNe Ia. Also, the detection of narrow Si, S and C features in the pre-maximum spectra suggests a thermonuclear explosion mechanism. The late-phase spectra show a complex overlap of both permitted and forbidden Fe, Ca and Co lines. The appearance of strong [Ca II] lambda lambda 7292, 7324 again mirrors the late-time spectra of SN 2008ha and SN 2002cx. The photometric resemblance to SN 2002cx and the spectral similarities to SN 2008ha highlight the peculiarity of SN 2014ck, and the complexity and heterogeneity of the SNe Iax class.

Publication Note

The publisher’s version of record is available at https://doi.org/10.1093/mnras/stw696

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2-parameter luminosity correction, AP, SB, NER, LTar, GT and MT are partially supported by the PRIN-INAF 2014 with the project 'Transient Universe: unveiling new types of stellar explosions with PESSTO'. NER acknowledge the support from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 267251 'Astronomy Fellowships in Italy' (AstroFIt). AMG acknowledges financial support by the Spanish Ministerio de Economia y Competitividad (MINECO), grant ESP2013-41268-R. MS and EYH acknowledge support provided by the Danish Agency for Science and Technology and Innovation through a Sapere Aude Level 2 grant., dust extinction, early phases, explosion, galaxies: individual: UGC 12182, GN-2014A-Q-8 and GN-2014B-Q-41. Gemini is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (USA), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministerio da Ciencia, Tecnologia e Inovacao (Brazil) and Ministerio de Ciencia, Tecnologia e Innovacion Productiva (Argentina). Also based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555., hubble-space-telescope, IRAF packages, distributed by the National Optical Astronomy Observatory, operated by the Associated Universities for Research in Astronomy, Inc. under cooperative agreement with the National Science Foundation, light curves, progenitor, rise-time, spectra, supernovae: general, supernovae: individual: SN 2006fp, supernovae: individual: SN 2014ck, the SDSS-III DR12 (APOGEE-1, BOSS, MARVELS, SEGUE-2) managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration, see the web site www.sdss.org., This research has made use of: the NED which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration, white-dwarfs

DOI URL

https://doi.org/10.1093/mnras/stw696

Identifier

FSU_libsubv1_wos_000376386600076
10.1093/mnras/stw696

Language

English

Tomasella, L., Cappellaro, E., Benetti, S., Pastorello, A., Hsiao, E. Y., Sand, D. J., … Turatto, M. (2016). Optical And Near-infrared Observations Of Sn 2014ck: An Outlier Among The Type Iax Supernovae. Monthly Notices Of The Royal Astronomical Society. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000376386600076

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Optical and near-infrared observations of SN 2014ck

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