Tartaglia, L., Fraser, M., Sand, D. J., Valenti, S., Smartt, S. J., McCully, C., Anderson, J. P., Arcavi, I., Elias-Rosa, N., Galbany, L., Gal-Yam, A., Haislip, J. B., Hosseinzadeh, G., Howell, D. A., Inserra, C. ![]() ![]() |
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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 $15\mbox{--}20$ M ${}_{\odot }$, depending on the distance modulus adopted for NGC 613. Modeling the temperature evolution within $5\,\mathrm{days}$ of explosion, we obtain a progenitor radius of $\sim 48\mbox{--}124$ R ${}_{\odot }$, smaller than that obtained from the analysis of the pre-explosion images ($240\mbox{--}320$ R ${}_{\odot }$).
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Physics and Astronomy |
Publisher: | American Astronomical Society |
ISSN: | 2041-8205 |
Date of First Compliant Deposit: | 23 January 2019 |
Date of Acceptance: | 25 January 2017 |
Last Modified: | 06 May 2023 07:44 |
URI: | https://orca.cardiff.ac.uk/id/eprint/118668 |
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