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

The Progenitor and Early Evolution of the Type IIb SN 2016gkg
The Progenitor and Early Evolution of the Type IIb SN 2016gkg
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 {}⊙ ).
supernovae: general, supernovae: individual: 2016gkg
2041-8205
Tartaglia, L.
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Sand, D. J.
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Smartt, S. J.
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Fraser, M.
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McCully, C.
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Anderson, J. P.
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Arcavi, I.
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Galbany, L.
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Gal-Yam, A.
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Hosseinzadeh, G.
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Howell, D. A.
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Inserra, C.
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Jha, S. W.
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Lundqvist, P.
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Maguire, K.
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Smith, M.
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Stritzinger, M.
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Sullivan, M.
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Tartaglia, L.
400f3eae-2f08-4609-9470-1bd17204e5db
Sand, D. J.
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Smartt, S. J.
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Fraser, M.
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McCully, C.
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Anderson, J. P.
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Arcavi, I.
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Galbany, L.
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Gal-Yam, A.
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Hosseinzadeh, G.
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Howell, D. A.
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Inserra, C.
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Jha, S. W.
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Lundqvist, P.
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Maguire, K.
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Smith, M.
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Stritzinger, M.
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Sullivan, M.
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Tartaglia, L., Sand, D. J., Smartt, S. J., Fraser, M., McCully, C., Anderson, J. P., Arcavi, I., Galbany, L., Gal-Yam, A., Hosseinzadeh, G., Howell, D. A., Inserra, C., Jha, S. W., Lundqvist, P., Maguire, K., Smith, M., Stritzinger, M. and Sullivan, M. (2017) The Progenitor and Early Evolution of the Type IIb SN 2016gkg. The Astrophysical Journal Letters, 836 (1). (doi:10.3847/2041-8213/aa5c7f).

Record type: Article

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 {}⊙ ).

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tartaglia_et_al_2016gkg_2 - Accepted Manuscript
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Accepted/In Press date: 25 January 2017
e-pub ahead of print date: 10 February 2017
Keywords: supernovae: general, supernovae: individual: 2016gkg

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Local EPrints ID: 413465
URI: https://eprints.soton.ac.uk/id/eprint/413465
ISSN: 2041-8205
PURE UUID: 775bdc38-ac50-4191-82b3-98283e7ee100
ORCID for C. Inserra: ORCID iD orcid.org/0000-0002-3968-4409
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 24 Aug 2017 16:30
Last modified: 14 Mar 2019 05:44

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Contributors

Author: L. Tartaglia
Author: D. J. Sand
Author: S. J. Smartt
Author: M. Fraser
Author: C. McCully
Author: J. P. Anderson
Author: I. Arcavi
Author: L. Galbany
Author: A. Gal-Yam
Author: G. Hosseinzadeh
Author: D. A. Howell
Author: C. Inserra ORCID iD
Author: S. W. Jha
Author: P. Lundqvist
Author: K. Maguire
Author: M. Smith
Author: M. Stritzinger
Author: M. Sullivan ORCID iD

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