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|Title:||Signatures of an eruptive phase before the explosion of the peculiar core-collapse SN 2013gc||Authors:||REGUITTI, ANDREA
Morrell, N. I.
Olivares E., F.
Reichart, D. E.
Haislip, J. B.
Smartt, S. J.
|Issue Date:||2019||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||482||Issue:||2||First Page:||2750||Abstract:||We present photometric and spectroscopic analysis of the peculiar core-collapse supernova (SN) 2013gc, spanning 7 yr of observations. The light curve shows an early maximum followed by a fast decline and a phase of almost constant luminosity. At +200 d from maximum, a brightening of 1 mag is observed in all bands, followed by a steep linear luminosity decline after +300 d. In archival images taken between 1.5 and 2.5 yr before the explosion, a weak source is visible at the supernova location, with mag ≈20. The early supernova spectra show Balmer lines, with a narrow (∼560 km s<SUP>-1</SUP>) P-Cygni absorption superimposed on a broad (∼3400 km s<SUP>-1</SUP>) component, typical of Type IIn events. Through a comparison of colour curves, absolute light curves, and spectra of SN 2013gc with a sample of supernovae IIn, we conclude that SN 2013gc is a member of the so-called Type IId subgroup. The complex profile of the H α line suggests a composite circumstellar medium geometry, with a combination of lower velocity, spherically symmetric gas, and a more rapidly expanding bilobed feature. This circumstellar medium distribution has been likely formed through major mass-loss events that we directly observed from 3 yr before the explosion. The modest luminosity (M<SUB>I</SUB> ∼ -16.5 near maximum) of SN 2013gc at all phases, the very small amount of ejected <SUP>56</SUP>Ni (of the order of 10<SUP>-3</SUP> M<SUB>☉</SUB>), the major pre-supernova stellar activity, and the lack of prominent [O I] lines in the late-time spectra support a fall-back core-collapse scenario for the massive progenitor of SN 2013gc.||URI:||http://hdl.handle.net/20.500.12386/28955||URL:||https://academic.oup.com/mnras/article/482/2/2750/5142715||ISSN:||0035-8711||DOI:||10.1093/mnras/sty2870||Bibcode ADS:||2019MNRAS.482.2750R||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Jan 16, 2021
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