J/A+A/700/A156ivo://CDS.VizieR/J/A+A/700/A156doi:10.26093/cds/vizier/bc-nw/lbfgCDSWang Z.-Y.Pastorello A.Cai Y.-Z.Fraser M.Reguitti A.Lin W.-L,Tartaglia L.Andrew Howell D.Benetti S.Cappellaro E.Chen Z.-H.,Elias-Rosa N.Farah J.Fiore A.Hiramatsu D.Kankare E.Li Z.-T.,Lundqvist P.Mazzali P.A.McCully C.Mo J.Moran S.Newsome M.,Padilla Gonzalez E.Pellegrino C.Peng Z.-H.Smartt S.J.Srivastav S.,Stritzinger M.D.Terreran G.Tomasella L.Valerin G.Wang G.-J.,Wang X.-F.de Boer T.Chambers K.C.Gao H.Guo F.-Z.Gutierrez C.P.,Kangas T.Karamehmetoglu E.Li G.-C.Lin C.-C.Lowe T.B.Ma X.-R.,Magnier E.A.Minguez P.Pei S.-P.Reynolds T.M.Wainscoat R.J.Wang B.,Williams S.Wu C.-Y.Yan S.-Y.Zhang J.-J.Zhang X.-H.Zhu X.-J.2026-08-28T12:42:11Z2025-08-22T08:17:45ZCDS support team

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

cds-question@unistra.frsupernovaevisible-astronomybroad-band-photometrysloan-photometryultraviolet-photometryapparent-magnitudeWe present the photometric and spectroscopic analysis of five Type Ibn supernovae (SNe): SN 2020nxt, SN 2020taz, SN 2021bbv, SN 2023utc, and SN 2024aej. These events share key observational features and belong to a family of objects similar to the prototypical Type Ibn SN 2006jc. The SNe exhibit rise times of approximately 10 days and peak absolute magnitudes ranging from -16.5 to -19mag. Notably, SN 2023utc is the faintest Type Ibn supernova discovered to date, with an exceptionally low r-band absolute magnitude of -16.4mag. The pseudo-bolometric light curves peak at (1-10)x10^42^erg/s, with total radiated energies on the order of (1-10)x10^48^erg. Spectroscopically, these SNe display relatively slow spectral evolution; the early spectra are characterised by a hot blue continuum and prominent HeI emission lines. Early spectra show blackbody temperatures exceeding 10000K, with a subsequent decline in temperature during later phases. Narrow HeI lines, indicative of unshocked circumstellar material (CSM), show velocities of approximately 1000km/s. The spectra suggest that the progenitors of these SNe underwent significant mass loss prior to the explosion, resulting in a He-rich CSM. Light curve modelling yields estimates for the ejecta mass (M_ej_) in the range 1-3M_{sun}_, with kinetic energies (E_Kin_) of (0.1-1)x10^50^erg. The inferred CSM mass ranges from 0.2 to 1M_{sun}_. These findings are consistent with expectations for core-collapse events arising from relatively massive, envelope-stripped progenitors.2025A&A...700A.156Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/700/A156CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/700/A156https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/700/A156http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/700/A156https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/700/A156https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/700/A156http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/700/A156GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/700/A156/table1 (Basic information for the five Ibn SN host galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/700/A156/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/700/A156/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/700/A156/table1?GETtext/xml+votable180.050000true339.400979235.00213330.0055555555555555566/2442 7267 13528 19394 27812https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/700/A156?format=asciiUVOpticaldefaultJ/A+A/700/A156/table1Basic information for the five Ibn SN host galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLCVelocity Plotmeta.ref.urlcharSNSN name (YYYYaaa)meta.id;meta.maincharHostHost Galaxymeta.id.parentcharzRedshiftsrc.redshiftfloate_zRedshift errorstat.error;src.redshiftfloatDistDistanceMpcpos.distancefloate_DistDistance errorMpcstat.errorfloatMODDistance modulusmagphot.mag.distModfloate_MODDistance modulus errormagstat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlcharRDistRadial distancekpcpos.distancefloate_RDistRadial distance errorkpcstat.errorfloatE(B-V)MWReddeningmagphot.color.excessfloatFileNameName of the light curve filemeta.id;meta.filechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/700/A156/2020nxtLight curves of SN 2020nxtrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of observation (YYYY/MM/DD)time.epochnullableMJDModified Julian Datedtime.epochdoubleFilterFilter (1)meta.id;instr.filtercharmagTypeAB or Vegameta.notecharl_magLimit flag on magmeta.code.errorcharmagApparent magnitude in Filtermagphot.magfloate_mag? Error on apparent magnitude in Filtermagstat.error;phot.magfloatnullableInstInstrument or Sourcemeta.id;instrcharJ/A+A/700/A156/2020tazLight curves of SN 2020tazrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of observation (YYYY/MM/DD)time.epochnullableMJDModified Julian Datedtime.epochdoubleFilterFilter (1)meta.id;instr.filtercharmagTypeAB or Vegameta.notecharl_magLimit flag on magmeta.code.errorcharmagApparent magnitude in Filtermagphot.magfloate_mag? Error on apparent magnitude in Filtermagstat.error;phot.magfloatnullableInstInstrument or Sourcemeta.id;instrcharJ/A+A/700/A156/2021bbvLight curves of SN 2021bbvmagApparent magnitude in Filtermagphot.magfloate_mag? Error on apparent magnitude in Filtermagstat.error;phot.magfloatnullableInstInstrument or Sourcemeta.id;instrcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of observation (YYYY/MM/DD)time.epochnullableMJDModified Julian Datedtime.epochdoubleFilterFilter (1)meta.id;instr.filtercharmagTypeAB or Vegameta.notecharl_magLimit flag on magmeta.code.errorcharJ/A+A/700/A156/2023utcLight curves of SN 2023utcrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of observation (YYYY/MM/DD)time.epochnullableMJDModified Julian Datedtime.epochdoubleFilterFilter (1)meta.id;instr.filtercharmagTypeAB or Vegameta.notecharl_magLimit flag on magmeta.code.errorcharmagApparent magnitude in Filtermagphot.magfloate_mag? Error on apparent magnitude in Filtermagstat.error;phot.magfloatnullableInstInstrument or Sourcemeta.id;instrcharJ/A+A/700/A156/2024aejLight curves of SN 2024aejrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of observation (YYYY/MM/DD)time.epochnullableMJDModified Julian Datedtime.epochdoubleFilterFilter (1)meta.id;instr.filtercharmagTypeAB or Vegameta.notecharl_magLimit flag on magmeta.code.errorcharmagApparent magnitude in Filtermagphot.magfloate_mag? Error on apparent magnitude in Filtermagstat.error;phot.magfloatnullableInstInstrument or Sourcemeta.id;instrchar