J/ApJ/881/22ivo://CDS.VizieR/J/ApJ/881/22doi:10.26093/cds/vizier.18810022CDSAfsariardchi 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.2021-12-07T01:03:20Z2021-01-07T12:25:15ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsupernovaeinfrared-photometryvisible-astronomybroad-band-photometryWe 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 (t_rise_~20days in the V band), a moderately luminous peak (M_V_~-17.6mag), a notably luminous and flat plateau (M_V_~-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 ^56^Ni mass powering the observed radioactive tail to be 0.10{+/-}0.01M_{sun}_, making it an H-rich Type II SN with one of the largest ^56^Ni 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_{sun}_ (evolved from a star with an initial mass of ~18.8M_{sun}_) and ~1040R_{sun}_, respectively, with the SN explosion energy of ~1.3x10^51^erg. The above-average mass of the KSP-SN-2016kf progenitor, together with its low metallicity of Z/Z_{sun}_~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.2019ApJ...881...22Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/881/22CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/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)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/881/22https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/881/22http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/881/22https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/881/22https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/881/22http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/881/22GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/881/22/table1KSP-SN-2016kf optical photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[57737/57891] Observation Modified Julian Datedtime.epochdoubleFiltFilter used; B, V or Iinstr.setupcharmag[16.39/23.44] Observed magnitude in Filter (1)magphot.mag;em.optfloate_mag[0.03/2.66]? Uncertainty in magmagstat.error;phot.magfloatnullable