J/MNRAS/546/F228ivo://CDS.VizieR/J/MNRAS/546/F2281doi:10.26093/cds/vizier/bg-h2/qccibCDSHakobyan A.A.Gevorgyan M.H.Karapetyan A.G.Mamon G.A.Kunth D.,Adibekyan V.Barkhudaryan L.V.2026-03-02T20:04:24Z2026-02-24T07:03:49ZCDS support team

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

cds-question@unistra.frsupernovaePhotospheric and high-velocity features (PVFs and HVFs) of SiII {lambda}6355 and CaII IR3 lines in supernova Ia (SN Ia) spectra provide insights into ejecta structure, energetics, and circumstellar interaction, yet their interplay remains poorly understood. We analyse a representative sample of 145 nearby SNe Ia observed within +/-5d of B-band maximum light, including normal, 91T-, and 91bg-like events with measured light-curve decline rates ({Delta}m_15_) and SiII and CaII line properties from the literature. We model PVF and HVF velocity distributions using Gaussian Mixture Models, compare SiII and CaII PVF velocity distributions, assess CaII HVF properties, and test correlations between SiII PVF velocities and {Delta}m_15_, with emphasis on HVF effects. For the first time, we show that the CaII PVF velocity distribution, measured for the same events at the same phases as SiII, is predominantly unimodal, in contrast to the well-known bimodal SiII PVF distribution that supports the high-velocity/normal-velocity division. This contrast likely reflects a subclass-dependent formation depth of the CaII line, as supported by a positive correlation (>3.3{sigma}) between {Delta}m_15_ and the velocity offset between CaII and SiII PVFs, particularly in faster-declining SNe Ia. Importantly, HVFs do not significantly bias PVF velocity distributions. A significant negative correlation (>3.3{sigma}) between SiII PVF velocity and {Delta}m_15_ is found only for HVF-weak SNe Ia, consistent with more energetic explosions yielding faster ejecta, while this trend vanishes in HVF-strong events, likely due to circumstellar interaction. These results underscore the critical role of HVFs and SN Ia subclass in interpreting ejecta kinematics in both models and observations.2026MNRAS.546f2281Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/546/F2281CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/451/1973 : Type Ia supernovae high-velocity features (Silverman+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/546/F2281https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/546/F2281http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/546/F2281https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/546/F2281https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/546/F2281http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/546/F2281GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/546/F2281/suppl (Properties of 145 SNe Ia)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/546/F2281/suppl?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/546/F2281/suppl?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/546/F2281/suppl?GETtext/xml+votable180.050000true189.419666711.823750.0055555555555555566/50 224 248 611 626 697 1688 2142 2169 2227 2340 2347 2473 3415 4447 4577 4583 4684 4719 4993 4999 5100 5975 6062 6101 7104 7166 7369 7523 7564 7747 8064 8267 8526 9640 10144 10203 10206 10232 10377 10379 10391 10454 10563 10767 10978 11064 11071 11158 11246 11273 11434 11713 11886 11939 12103 12455 13313 13316 13350 13529 13536 14882 15954 16690 17239 17401 17500 17662 17741 17817 18016 18081 18206 18735 19084 19094 19116 19283 19321 19387 19506 19515 19560 19581 19619 19848 20014 20031 20206 20237 22826 23013 23023 23077 23294 23349 23828 24926 25565 25769-25770 25960 26117 26432 26563 26697 27367 27491 27728 27738 27761 27773 27914 28035 28089 28112 28126 28249 28353 28368 28498 28572 28619 30044 31218 31230 31293 31628 31685 32136 32187 32561 32602 34531 34534 36805 40252 40379 44915 45036https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/546/F2281?format=asciidefaultJ/MNRAS/546/F2281/supplProperties of 145 SNe IarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNnameSupernova (SN) namemeta.id;meta.maincharSNsubclassSN spectroscopic subclass (1)src.classcharr_SNsubclassSource of SN subclassmeta.ref;pos.framechardm15? SN light curve (LC) decline ratemagphot.mag;arith.difffloatnullablee_dm15? Error of SN LC decline ratemagstat.errorfloatnullabler_dm15? Source of SN LC decline ratemeta.ref;pos.framecharzRedshift of SNsrc.redshiftfloatSimbadNameSimbad 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.main