J/A+A/708/A270ivo://CDS.VizieR/J/A+A/708/A270CDSFarias D.Gall C.Villar V.A.Auchettl K.de Soto K.M.Gagliano A.,Hoogendam W.B.Narayan G.Sedgewick A.Yadavalli S.K.Zenati Y.,Angus C.R.Davis K.W.Hjorth J.Jacobson-Galan W.V.Jones D.O.,Kilpatrick C.D.Bustamante Rosell M.J.Coulter D.A.Dimitriadis G.,Foley R.J.Gangopadhyay A.Gao H.Huber M.E.Izzo L.Johnson J.L.,Piro A.L.Rest A.Rojas-Bravo C.Siebert M.R.Taggart K.Tinyanont S.2026-04-15T17:56:12Z2026-04-15T08:41:21ZCDS support team

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

cds-question@unistra.frsupernovaephotometryvisible-astronomyultraviolet-astronomyspectroscopyType Ibn supernovae (SNe) are characterized by narrow helium (He i) lines from photons produced by the unshocked circumstellar material (CSM). About 80 SNe Ibn have been discovered to date, and only a handful have extensive observational records. Thus, many open questions regarding the progenitor system and the origin of the CSM remain. Here we investigate potential correlations between the spectral features of the prominent HeI {lambda}5876{AA} line and the optical and X-ray light curve properties of SNe Ibn. We compile the largest sample of 61 SNe Ibn to date, of which 24 SNe have photometric and spectroscopic data from the Young Supernova Experiment and 37 SNe have archival data sets. We fit 24 SNe Ibn with sufficient photometric coverage (B to z bands) using semi-analytical models from MOSFiT. We demonstrate that the light curves of SNe Ibn are more diverse than previous analyses suggest, with absolute r-band peak magnitudes (rmax) of -19.4+/-0.6mag and rise (from ~10 days to peak, {gamma}_-10_) and decay-rates (from peak to +10 days; {gamma}_+10_) of -0.08+/-0.06 and 0.08+/-0.03mag/day, respectively. We find that the majority of SNe Ibn in the sub-sample are consistent with a low-energy explosion (<10^51^erg) of a star with a compact envelope surrounded by ~0.1M_{sun}_ of helium-rich CSM. The inferred ejecta masses are small (M_ej_~1M_{sun}_) and expand with a velocity of ~5000km/s. Our spectroscopic analysis shows that the mean velocity of the narrow component of the HeI lines, associated to the CSM, peaks at ~1100km/s. The mean CSM and ejecta masses inferred for a sub-sample of SNe Ibn indicate that their progenitors are not massive (~10M_{sun}_), single stars at the moment of explosion, but are likely binary systems. This agrees with the detection of potential companion stars of SNe Ibn progenitors, and the inferred CSM properties from stellar evolution models.2026A&A...708A.270Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/708/A270CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/708/A270https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/708/A270http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/708/A270https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/708/A270https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/708/A270http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/708/A270GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/708/A270/tabled3 (Summary of type Ibn SNe in the F25 sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/708/A270/tabled3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/708/A270/tabled3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/708/A270/tabled3?GETtext/xml+votable180.050000true103.69625-59.5030.0055555555555555566/3437 4586 7267 8725 9720 11615 12333 12393 13528 15915 18060 18891 19394 20206 20720 21262 22717 25974 26306 27228 28042 38940 43995 48487https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/708/A270?format=asciiUVOpticaldefaultJ/A+A/708/A270/tabled3Summary of type Ibn SNe in the F25 samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLClight curvesmeta.ref.urlcharNameName of the supernovameta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainHostHost Galaxymeta.id.parentcharzRedshiftsrc.redshiftfloatMJDNodified Julain datedtime.epochdoubleE(B-V)MWMean value of E(B-V) from Schlafly & Finkbeiner (2011ApJ...737..103S)magphot.color.excessfloatE(B-V)host? Host E(B-V) (1)magphot.color.excessfloatnullableE_E(B-V)host? Host E(B-V) upper errormagstat.error;stat.maxfloatnullablee_E(B-V)host? Host E(B-V) lower errormagstat.errorfloatnullableX-ray[Yes No] SN was observed in X-ray ?meta.codecharMOSFiT[Yes No] SN has been modeled using MOSFiT ?meta.codecharJ/A+A/708/A270/spec_tabLog of spectroscopic observations of Type Ibn SNe in the F25 (table D2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the supernovameta.id;meta.maincharDateObservation datetime.epoch;obsnullablePhasePhase (1)dtime.phaseintRangeWavelength range of the spectrograph in {AA}0.1nminstr.dispersion;em.wlcharDispDispersion of the spectrograph0.1nminstr.dispersionfloatInstName of the instrumentmeta.id;instrcharn_Inst[+] Note on Inst (2)meta.notecharAnalysis[VX] Analysis (3)meta.codecharJ/A+A/708/A270/spec_proMinimum and maximum velocity of the narrow and broad components of He I 5876{A}A line of 59 SNe Ibn (table D7)SimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the supernovameta.id;meta.maincharl_Vnarrow[~] Limit flag on Vnarrowmeta.code.errorcharVnarrow? Velocity of the narrow component of HeI 5876{AA}km/sspect.dopplerVelocintnullableE_Vnarrow? 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