J/ApJ/881/22 BVI photometry of the TypeII SN KSP-SN-2016kf (Afsariardchi+, 2019)
KSP-SN-2016kf: a long-rising H-rich Type II supernova with unusually high 56Ni
mass discovered in the KMTNet Supernova Program.
Afsariardchi N., Moon D.-S., Drout M.R., Gonzalez-gaitan S., Ni Y.Q.,
Matzner C.D., Kim S.C., Lee Y., Park H.S., Gal-yam A., Pignata G.,
Koo B.-C., Ryder S., Cha S.-M., Lee Y.
<Astrophys. J., 881, 22-22 (2019)>
=2019ApJ...881...22A 2019ApJ...881...22A (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae; Photometry, UBVRI
Keywords: supernovae: general ; supernovae: individual
Abstract:
We present the discovery and the photometric and spectroscopic study
of H-rich Type II supernova (SN) KSP-SN-2016kf (SN2017it) observed in
the KMTNet Supernova Program in the outskirts of a small irregular
galaxy at z∼0.043 within a day of the explosion. Our high-cadence,
multi-color (BVI) light curves of the SN show that it has a very long
rise time (trise∼20days in the V band), a moderately luminous peak
(MV~-17.6mag), a notably luminous and flat plateau (MV~-17.4mag
and decay slope s∼0.53mag per 100 days), and an exceptionally bright
radioactive tail. Using the color-dependent bolometric correction to
the light curves, we estimate the 56Ni mass powering the observed
radioactive tail to be 0.10±0.01M☉, making it an H-rich Type
II SN with one of the largest 56Ni masses observed to date. The
results of our hydrodynamic simulations of the light curves constrain
the mass and radius of the progenitor at the explosion to be
∼15M☉ (evolved from a star with an initial mass of
∼18.8M☉) and ∼1040R☉, respectively, with the SN explosion
energy of ∼1.3x1051erg. The above-average mass of the KSP-SN-2016kf
progenitor, together with its low metallicity of Z/Z☉∼0.1--0.4
obtained from spectroscopic analysis, is indicative of a link between
the explosion of high-mass red supergiants and their low-metallicity
environment. The early part of the observed light curves shows the
presence of excess emission above what is predicted in model
calculations, suggesting there is interaction between the ejecta and
circumstellar material. We further discuss the implications of the
high initial mass of the progenitor and the low-metallicity
environment of KSP-SN-2016kf for our understanding of the origin of
Type II SNe.
Description:
KSP-SN-2016kf was first detected on 2016 December 24 as part of the
Korea Microlensing Telescope Network (KMTNet) Supernova Program (KSP).
The KMTNet is a network of three 1.6m telescopes located in Chile,
South Africa, and Australia, providing 24hr continuous sky coverage.
Each telescope of the KMTNet is equipped with a wide-field CCD camera
covering a 2°x2° field at 0.4"/pixel sampling. Between 2016
October and 2017 May, we obtained about 600 images per BVI band, with
a mean cadence of roughly 9hr per band, for a field around the nearby
galaxy NGC2188. All the images were obtained with 60s exposure time,
reaching limiting magnitudes of ∼20.5-22.5 depending on the filter and
observational conditions.
Objects:
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RA (2000) DE Designation(s)
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06 10 37.14 -34 08 27.7 KSP-SN-2016kf = SN 2017it
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 24 1422 KSP-SN-2016kf optical photometry
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See also:
J/ApJ/729/143 : Photometry of type IIn SN 2008am (Chatzopoulos+, 2011)
J/ApJ/731/120 : Intrinsic SN Ia light curves (Mandel+, 2011)
J/ApJ/736/159 : SN Ia candidates from the SDSS-II SN Survey (Sako+, 2011)
J/ApJ/742/L18 : Follow-up photometry of the SN IIb PTF 11eon (Arcavi+, 2011)
J/ApJ/781/42 : Optical photometry of SN 2010jl (Ofek+, 2014)
J/ApJ/789/104 : SNe IIn observations and properties (Ofek+, 2014)
J/ApJ/813/30 : UV-Optical light curves of the SNIa iPTF14bdn (Smitka+, 2015)
J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)
J/A+A/611/A25 : Updated Type II supernova Hubble diagram (Gall+, 2018)
J/ApJ/853/62 : Optical and NIR spectra and LCs of SN2016ija (Tartaglia+, 2018)
J/ApJ/873/L3 : NUV to NIR photometry of type IIP ASASSN-16at (Bose+, 2019)
J/A+A/637/A73 : Type IIn supernova photometry (Nyholm+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.3 d MJD [57737/57891] Observation Modified Julian Date
11 A1 --- Filt Filter used; B, V or I
13- 17 F5.2 mag mag [16.39/23.44] Observed magnitude in Filter (1)
19- 24 F6.2 mag e_mag [0.03/2.66]? Uncertainty in mag
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Note (1): Magnitudes are in the Vega system and not corrected for extinction
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 22-Dec-2020