J/ApJ/946/30ivo://CDS.VizieR/J/ApJ/946/30CDSBen-Ami T.Arcavi I.Newsome M.Farah J.Pellegrino C.Terreran G.,Burke J.Hosseinzadeh G.McCully C.Hiramatsu D.Gonzalez E.P.,Howell D.A.2025-06-02T07:05:25Z2025-04-07T13:51:04ZCDS support team

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

cds-question@unistra.frsupernovaephotometryvisible-astronomyspectroscopyType Ibn supernovae (SNe) are a rare class of stellar explosions whose progenitor systems are not yet well determined. We present and analyze observations of the Type Ibn SN 2019kbj, and model its light curve in order to constrain its progenitor and explosion parameters. SN 2019kbj shows roughly constant temperature during the first month after peak, indicating a power source (likely circumstellar material interaction) that keeps the continuum emission hot at ~15000K. Indeed, we find that the radioactive decay of 56Ni is disfavored as the sole power source of the bolometric light curve. A radioactive decay + circumstellar material (CSM) interaction model, on the other hand, does reproduce the bolometric emission well. The fits prefer a uniform-density CSM shell rather than CSM due to a steady mass-loss wind, similar to what is seen in other Type Ibn SNe. The uniform-density CSM shell model requires ~0.1M_{sun}_ of ^56^Ni and ~1M_{sun}_ total ejecta mass to reproduce the light curve. SN 2019kbj differs in this manner from another Type Ibn SN with derived physical parameters, SN 2019uo, for which an order of magnitude lower ^56^Ni mass and larger ejecta mass were derived. This points toward a possible diversity in SN Ibn progenitor systems and explosions.2023ApJ...946...30Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/946/30CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/383/1485 : BVRI light curves of SN 2003jd (Valenti+, 2008)J/AJ/137/4517 : UVOT light curves of supernovae (Brown+, 2009)J/ApJ/769/39 : SNIbn PS1-12sk optical and NIR light curves (Sanders+, 2013)J/MNRAS/438/L101 : First month on SN 2013ej (Valenti+, 2014)J/MNRAS/449/1921 : UV/opt/NIR photometry for Type Ibn SNe (Pastorello+, 2015)J/MNRAS/449/1941 : Opt/NIR photometry of OGLE-2012-SN-006 (Pastorello+, 2015)J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)J/A+A/602/A93 : SN type Ibn OGLE-2014-SN-131 LCs (Karamehmetoglu+, 2017)J/A+A/605/A6 : Photometry of supernova iPTF13z (Nyholm+, 2017)J/ApJ/917/97 : Spectroscopic obs. of type Ibn ASASSN-14ms (Wang+, 2021)J/ApJ/926/125 : SNIbn with LCO LCs & FLOYDS sp. (Pellegrino+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/946/30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/946/30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/946/30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/946/30https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/946/30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/946/30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/946/30/table1Photometry of SN2019kbjrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[58663.49/58715.41] Modified Julian date of observation (JD-2400000.5)dtime.epochdoubleFiltFiltermeta.id;instr.filtercharl_omagLimit flag on omagmeta.code.errorcharomag[16.13/20.8] Magnitude in Filtmagphot.magdoublee_omag[0.006/0.31]? Uncertainty in omagmagstat.error;phot.magdoublenullableSource[2/10] Source for observation (1)meta.bibintJ/ApJ/946/30/table2Log of spectroscopic observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of observation (UT)time.epochnullableMJD[58666.68/59722.52] Modified Julian Datedtime.epochdoublePhase[-2.42/35.43]? Phasedtime.intervalfloatnullableTelTelescopemeta.id;instr.telcharFileName of the ASCII file in subdirectory "sp"; column added by CDSmeta.id;meta.filecharHostHost?meta.notecharspInteractive spectrum plotmeta.ref.urlcharJ/ApJ/946/30/table4Results of blackbody fits to the photometry of SN 2019kbjrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[58665.5/58705.4] Modified Julian date of fit (JD-2400000.5)dtime.epochfloatPhase[-3.61/36.3] Phase since 2019 July 1 UTdtime.intervalfloatTemp[9946/19587] TemperatureKphys.temperatureinte_Temp[80/3247] Lower uncertainty on TempKstat.error;stat.min;phys.temperatureintE_Temp[89/5326] Upper uncertainty on TempKstat.error;stat.max;phys.temperatureintRad[2.88/13.1] Radius, 10+14cm1e+12mphys.size.radiusfloate_Rad[0.09/1] Lower uncertainty on Rad1e+12mstat.error;stat.min;phys.size.radiusfloatE_Rad[0.09/1.32] Upper uncertainty on Rad1e+12mstat.error;stat.max;phys.size.radiusfloatLum[0.18/4.5] Luminosity, 10+43erg/s1e+36Wphys.luminosityfloate_Lum[0.05/0.71] Lower uncertainty on Lum1e+36Wstat.error;stat.min;phys.luminosityfloatE_Lum[0.05/0.9] Upper uncertainty on Lum1e+36Wstat.error;stat.max;phys.luminosityfloat