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The Progenitor and Early Evolution of the Type IIb SN 2016gkg

Journal
Date Issued
2017
Author(s)
•
Fraser, M.
•
Sand, D. J.
•
Valenti, S.
•
Smartt, S. J.
•
McCully, C.
•
Anderson, J. P.
•
Arcavi, I.
•
•
Galbany, L.
•
Gal-Yam, A.
•
Haislip, J. B.
•
Hosseinzadeh, G.
•
Howell, D. A.
•
Inserra, C.
•
Jha, S. W.
•
Kankare, E.
•
Lundqvist, P.
•
Maguire, K.
•
Mattila, S.
•
Reichart, D.
•
Smith, K. W.
•
Smith, M.
•
Stritzinger, M.
•
Sullivan, M.
•
Taddia, F.
•
DOI
Abstract
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 ∼mid-F spectral type and initial mass 15{--}20 M {}☉ , depending on the distance modulus adopted for NGC 613. Modeling the temperature evolution within 5 {days} of explosion, we obtain a progenitor radius of ∼ 48{--}124 R {}☉ , smaller than that obtained from the analysis of the pre-explosion images (240{--}320 R {}☉ ).
Volume
836
Issue
1
Start page
L12
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2017ApJ...836L..12T
Rights
open.access
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