The Progenitor and Early Evolution of the Type IIb SN 2016gkg
Tartaglia L; Fraser M; Sand DJ; Valenti S; Smartt SJ; McCully C; Anderson JP; Arcavi I; Elias-Rosa N; Galbany L; Gal-Yam A; Haislip JB; Hosseinzadeh G; Howell DA; Inserra C; Jha SW; Kankare E; Lundqvist P; Maguire K; Mattila S; Reichart D; Smith KW; Smith M; Stritzinger M; Sullivan M; Taddia F; Tomasella L; Tomasella L
The Progenitor and Early Evolution of the Type IIb SN 2016gkg
Tartaglia L
Fraser M
Sand DJ
Valenti S
Smartt SJ
McCully C
Anderson JP
Arcavi I
Elias-Rosa N
Galbany L
Gal-Yam A
Haislip JB
Hosseinzadeh G
Howell DA
Inserra C
Jha SW
Kankare E
Lundqvist P
Maguire K
Mattila S
Reichart D
Smith KW
Smith M
Stritzinger M
Sullivan M
Taddia F
Tomasella L
Tomasella L
IOP PUBLISHING LTD
Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021042716917
https://urn.fi/URN:NBN:fi-fe2021042716917
Tiivistelmä
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).
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