J/MNRAS/491/2902ivo://CDS.VizieR/J/MNRAS/491/2902doi:10.26093/cds/vizier.74912902CDSFlors A.Spyromilio J.Taubenberger S.Blondin S.Cartier R.,Leibundgut B.Dessart L.Dhawan S.Hillebrandt W.2024-08-20T20:14:37Z2023-04-27T15:28:40ZCDS support team

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

cds-question@unistra.frsupernovaevisible-astronomyspectroscopyinfrared-astronomychemically-peculiar-starsA non-local-thermodynamic-equilibrium level population model of the first and second ionization stages of iron, nickel, and cobalt is used to fit a sample of XShooter optical + near-infrared (NIR) spectra of Type Ia supernovae (SNe Ia). From the ratio of the NIR lines to the optical lines limits can be placed on the temperature and density of the emission region. We find a similar evolution of these parameters across our sample. Using the evolution of the FeII 12570-7155{AA} line as a prior in fits of spectra covering only the optical wavelengths we show that the 7200{AA} feature is fully explained by [FeII] and [NiII] alone. This approach allows us to determine the abundance of NiII/FeII for a large sample of 130 optical spectra of 58 SNe Ia with uncertainties small enough to distinguish between Chandrasekhar mass (M_Ch_) and sub-Chandrasekhar mass (sub-M_Ch_) explosion models. We conclude that the majority (85 per cent) of normal SNe Ia have a Ni/Fe abundance that is in agreement with predictions of sub-M_Ch_ explosion simulations of ~Z_{sun}_ progenitors. Only a small fraction (11 per cent) of objects in the sample have a Ni/Fe abundance in agreement with M_Ch_ explosion models.2020MNRAS.491.2902Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/491/2902CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/491/2902https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/491/2902http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/491/2902https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/491/2902https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/491/2902http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/491/2902GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/491/2902/tableb1 (Overview of spectra observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/491/2902/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/491/2902/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/491/2902/tableb1?GETtext/xml+votable180.050000true190.736166713.25650.0055555555555555566/611 4149 4447 4719 5975 7606 11434 11496 12455 13907 15056 17340 17741 17761 18011 18325 18854 21300 22650 23077 23349 24920 24926 25344 25353 25571 25770 25960 26309 26336 27367 27426 27512 27738 27918 28035 28294 28299 31158 31230 34493 34531 34534 35885 36045 36391 37429 38655 38664 38956 40424 43339 44000 44915 46104 46399 48665https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/491/2902?format=asciiOpticalInfrareddefaultJ/MNRAS/491/2902/tableb1Overview of spectra observationsSimbadNameSimbad column added by the CDSmeta.idcharnullablezRedshiftsrc.redshiftdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSupernova namemeta.id;meta.maincharSubtypeSupernova subtype (Ia-norm or 91T-like)src.spTypecharE(B-V)B-V colour excessmagphot.color.excessfloatDatemaxDate of B-band maximumtime.epochcharEpochEpoch of the observationdtime.epochfloatTelTelescope used for the observationinstr.setupcharInstInstrument used for the observationinstr.setupcharRefspReference for the spectrameta.bibcharRefext? Other referencemeta.bibcharNi/FeinfNi/Fe mass ratio in the limit t->{infty}phys.mass;arith.ratiofloatE_Ni/FeinfUpper error on Ni/Feinfstat.error;stat.maxfloate_Ni/FeinfLower error on Ni/Feinfstat.errorfloat_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/MNRAS/491/2902/refsReferences for Table B1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.notecharBibCodeBibCodemeta.bib.bibcodecharAuthorAuthor's namemeta.bib.authorcharCommentsCommentsmeta.notechar