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http://hdl.handle.net/20.500.12386/26793
Titolo: | The Progenitor and Early Evolution of the Type IIb SN 2016gkg | Autori: | Tartaglia, L. Fraser, M. Sand, D. J. Valenti, S. Smartt, S. J. McCully, C. Anderson, J. P. Arcavi, I. ELIAS DE LA ROSA, NANCY DEL CARMEN 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. TOMASELLA, Lina |
Data pubblicazione: | 2017 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 836 | Fascicolo: | 1 | Da pagina:: | L12 | 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 {}<SUB>☉ </SUB>, 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 {}<SUB>☉ </SUB>, smaller than that obtained from the analysis of the pre-explosion images (240{--}320 R {}<SUB>☉ </SUB>). | URI: | http://hdl.handle.net/20.500.12386/26793 | URL: | https://iopscience.iop.org/article/10.3847/2041-8213/aa5c7f | ISSN: | 0004-637X | DOI: | 10.3847/2041-8213/aa5c7f | Bibcode ADS: | 2017ApJ...836L..12T | Fulltext: | open |
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