J/A+A/708/A267ivo://CDS.VizieR/J/A+A/708/A267CDSXiang D.Wang X.Zhang J.Yan S.Lin H.Rui L.Mo J.Zhang X.,Sai H.Miao C.Xi G.Chen Z.Guo F.Ma X.Li G.Zhang T.Chen L.,Liu J.Li W.Zhao X.Huang F.Cai Y.Lin W.Lin J.Wu C.Hu M.,Song C.Zhang J.Xia Q.Li Z.Li L.Zhang K.Zhai Q.Chen J.,Fan Z.Fu J.Qian S.Wu H.Wu X.-B.Yan J.Zhang H.Zhang J.,Zhang L.Zheng J.2026-05-04T07:43:19Z2026-04-14T09:56:10ZCDS support team

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

cds-question@unistra.frsupernovaespectroscopyThe extent of envelope stripping in the progenitor stars is directly reflected in the diversity of spectral features observed in stripped-envelope supernovae (SESNe). Through extensive spectral observation and analysis, we aim to clarify the statistical differences between the subclasses of SESNe. The Tsinghua Supernova group obtained 249 optical spectra of 62 SESNe during the years from 2010 to 2020, covering phases from -16 to over 190 days relative to maximum light. Most spectra were obtained during the photospheric phases after the supernova explosion. For each spectrum, the pseudo-equivalent widths (pEWs) and blueshift velocities of principal lines were measured. We further investigated the common spectral features by analysing their velocity and strength correlations across all subtypes. We identify the feature near 6200{AA} in SNe Ib as H{alpha} through comparison with SNe IIb and Ic, which resolves inconsistent literature interpretations. Our finding reveals prevalent residual hydrogen in SNe Ib, further supporting a continuous stripping sequence from SNe IIb to Ib. We observe a trend in increasing velocity among different subtypes of stripped-envelope SNe, with SNe IIb exhibiting the lowest line velocities, followed by Ib, Ic, and Ic-BL. Typically, the O~I lines in SNe Ic/Ic-BL are stronger than those seen in SNe IIb/Ib. In nebular phases, the [CaII] emission dominates over [OI] in SNe IIb/Ib while [OI] is stronger in SNe Ic, including the He-rich SN 2016coi. This spectral dichotomy implies that progenitors of SNe Ic (BL) have more massive CO cores and hence higher initial masses.2026A&A...708A.267Xhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/708/A267CatalogResearchIsServedByTAP 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/A267https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/708/A267http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/708/A267https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/708/A267https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/708/A267http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/708/A267GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/708/A267/tablea2 (Journal of spectroscopic observations of our SESNe sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/708/A267/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/708/A267/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/708/A267/tablea2?GETtext/xml+votable180.050000true35.8166667-7.08888890.0055555555555555566/908 1673 2132 2230 2452 2680 3073 3862 4498 4709 4839 5001 5124 5142 5244 5492 5642 5966 6030 7048 7137 7197 7874 8195 9096 9635 9648 10183 10290 10396 10481 10642 10739 11027 12641 13522 17278 17669 18326 18762 18846 20286 21815 22830 23437 25277 25336 25407 25763 26175 26395 26433 27255 27861 28035 30970 31426 32207 34694 43262 48665https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/708/A267?format=asciidefaultJ/A+A/708/A267/tablea2Journal of spectroscopic observations of our SESNe samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNSN namemeta.id;meta.maincharUT-dateUT date of observationtime.epoch;obsnullableJDJulian Date of observationdtime.epochdoublePhaseRestframe phase in days relative to maximum lightdtime;arith.difffloatTelName of the telescope (1)meta.id;instr.telcharwaveRangeWavelength Range in angtroms0.1nmem.wlcharSimbadNameSimbad column added by the CDSmeta.idcharnullable_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/708/A267/spearData behind Figs. 12,13recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeSN type (1)src.classcharParam1Parameter 1 of the correlationmeta.id;stat.fit.paramcharParam2Parameter 2 of the correlationmeta.id;stat.fit.paramcharrhoSpearman's rank correlation coefficientstat.fit.paramfloatpp-value of the correlationstat.correlationdoubleNNumber of data points in the correlationmeta.numberint