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The Progenitor and Early Evolution of the Type IIb SN 2016gkg
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Number of Authors: 27
2017 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 836, no 1, L12Article in journal (Refereed) Published
Abstract [en]

We report initial observations and analysis on the Type IIb SN 2016gkg in the nearby galaxy NGC 613. SN. 2016gkg exhibited a clear double-peaked light curve during its early evolution, as evidenced by our intensive photometric follow-up campaign. SN. 2016gkg shows strong similarities with other Type IIb SNe, in particular, with respect to the He I. emission features observed in both the optical and near-infrared. SN. 2016gkg evolved faster than the prototypical Type. IIb SN. 1993J, with a decline similar to that of SN. 2011dh after the first peak. The analysis of archival Hubble Space Telescope images indicate a pre-explosion source at SN. 2016gkg's position, suggesting a progenitor star with a similar to mid-F spectral type and initial mass 15-20 M-circle dot, depending on the distance modulus adopted for NGC. 613. Modeling the temperature evolution within 5 days of explosion, we obtain a progenitor radius of similar to 48-124 R-circle dot, smaller than that obtained from the analysis of the pre-explosion images (240-320 R-circle dot).

Place, publisher, year, edition, pages
2017. Vol. 836, no 1, L12
Keyword [en]
supernovae: general, supernovae: individual (2016gkg)
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-144589DOI: 10.3847/2041-8213/aa5c7fISI: 000401605400001OAI: oai:DiVA.org:su-144589DiVA: diva2:1127923
Available from: 2017-07-20 Created: 2017-07-20 Last updated: 2017-07-20Bibliographically approved

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Lundqvist, PeterTaddia, Francesco
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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