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Nebular spectroscopy of SN 2014J: Detection of stable nickel in near-infrared spectra
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). European Southern Observatory, Germany.
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Number of Authors: 82018 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 619, article id A102Article in journal (Refereed) Published
Abstract [en]

We present near-infrared (NIR) spectroscopy of the nearby supernova 2014J obtained similar to 450 d after explosion. We detect the [Ni II] 1.939 mu m line in the spectra indicating the presence of stable Ni-58 in the ejecta. The stable nickel is not centrally concentrated but rather distributed as the iron. The spectra are dominated by forbidden [Fe II] and [Co II] lines. We used lines, in the NIR spectra, arising from the same upper energy levels to place constraints on the extinction from host galaxy dust. We find that that our data are in agreement with the high A(v) and low R-v found in earlier studies from data near maximum light. Using a Ni-56 mass prior from near maximum light gamma-ray observations, we find 0.053 +/- 0.018 M-circle dot of stable nickel to be present in the ejecta. We find that the iron group features are redshifted from the host galaxy rest frame by similar to 600 km s(-1).

Place, publisher, year, edition, pages
2018. Vol. 619, article id A102
Keywords [en]
supernovae: individual: SN 2014J, supernovae: general
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-162852DOI: 10.1051/0004-6361/201833274ISI: 000449726900001OAI: oai:DiVA.org:su-162852DiVA, id: diva2:1274226
Available from: 2018-12-28 Created: 2018-12-28 Last updated: 2018-12-28Bibliographically approved

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Dhawan, Suhail
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