J/A+A/694/A9ivo://CDS.VizieR/J/A+A/694/A9doi:10.26093/cds/vizier.36940009CDSBurgaz U.Maguire K.Dimitriadis G.Harvey L.Senzel R.Sollerman J.,Nordin J.Galbany L.Rigault M.Smith M.Goobar A.Johansson J.,Rosnet P.Alburai A.Amenouche M.Deckers M.Dhawan S.Ginolin M.,Kim Y.-L.Miller A.A.Muller-Bravo T.E.Nugent P.E.Terwel J.H.,Dekany R.Drake A.Graham M.J.Groom S.L.Kasliwal M.M.Kulkarni S.R.,Nolan K.Nir G.Riddle R.L.Rusholme B.Sharma Y.2025-05-21T20:02:15Z2025-02-14T09:14:21ZCDS support team

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

cds-question@unistra.frsupernovaespectroscopyline-intensitiesvisible-astronomyMore than 3000 spectroscopically confirmed Type Ia supernovae (SNe Ia) are presented in the Zwicky Transient Facility SN Ia Data Release 2 (ZTF DR2). In this paper, we detail the spectral properties of 482 SNe Ia near maximum light, up to a redshift limit of z<0.06. We measure the velocities and pseudo-equivalent widths (pEW) of key spectral features (SiII 5972 and SiII 6355) and investigate the relation between the properties of the spectral features and the photometric properties from the SALT2 light-curve parameters as a function of spectroscopic sub-class. We discuss the non-negligible impact of host galaxy contamination on SN Ia spectral classifications, as well as investigate the accuracy of spectral template matching of the ZTF DR2 sample. We define a new subclass of underluminous SNe Ia ('04gs-like') that lie spectroscopically between normal SNe Ia and transitional 86G-like SNe Ia (stronger SiII 5972 than normal SNe Ia but significantly weaker TiII features than '86G-like' SNe). We model these '04gs-like' SN Ia spectra using the radiative-transfer spectral synthesis code tardis and show that cooler temperatures alone are unable to explain their spectra; some changes in elemental abundances are also required. However, the broad continuity in spectral properties seen from bright ('91T-like') to faint normal SN Ia, including the transitional and 91bg-like SNe Ia, suggests that variations within a single explosion model may be able to explain their behaviour.2025A&A...694A...9Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/694/A9CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/694/A10 : ZTF SN Ia DR2 (Dimitriadis+, 2025)J/A+A/694/A11 : SN 2020alm spectrum (Terwel+, 2025)J/A+A/694/A12 : ZTF SN Ia DR2. secondary maximum in Type Ia SN (Deckers+, 2025)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/694/A9https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/694/A9http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/694/A9https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/694/A9https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/694/A9http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/694/A9GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/694/A9/tablea1h (Measurements for d_DLR > 0.2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/694/A9/tablea1h?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/694/A9/tablea1h?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/694/A9/tablea1h?GETtext/xml+votable180.050000true183.846313927.62648810.005555555555555556Cone search capability for table J/A+A/694/A9/tablea1s (Measurements for d_DLR < 0.2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/694/A9/tablea1s?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/694/A9/tablea1s?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/694/A9/tablea1s?GETtext/xml+votable180.050000true237.5147542.08844440.0055555555555555566/24 73 176 192 248 255 551 580 635 969 991 1156 1174 1194 1563 1583 1642 1667 1672 1881 1888 1916 2053 2071 2128 2200 2286 2292 2308 2466 2616 2651 2694 2811 2815 2855 3074 3106 3573 3791 4225 4246 4376 4408 4796 4829 5129 5184 5204 5272 5359 5392 5424 5529 5603 5629 5668 5700 5716 5884 5920 5922 5983 6089 6104 6112 6121 6131 6220 6234 6276 6331 6473 6499 6551 6739 6743 6749 6852 6888 6990-6991 7012 7041 7066 7076 7156 7160 7247 7263 7275 7278 7280 7295 7345 7352 7523 7539 7572 7653 7674 7806 7959 8016 8050 8231 8242 8254 8273 8332 8346 8426 8443 8453 8512 8521 8526 8537 8543 8548 8550 8567 8586 8735 8757-8758 8764 8778 8789 8857 8926 8948 9005 9064 9098 9122 9180 9239 9246 9296 9327 9454 9470 9480 9543 9621 9644 9658 9666 9672 9695 9707 9746 9774 9812 9835 9841 9891 9925 9939 9984 10004 10058 10066 10124 10202 10207 10253 10280 10343 10379 10409 10520 10590 10593 10637 10670 10925 10968 11012 11056 11178 11181 11198 11414-11415 11433 11522 11551 11564 11568 11614 11643 11720 11820 11823 11826 11854 11908 11975 12008 12048 12188 12194 12209 12256 12267 12372 12477 12497 12507 12572 12579 12642 12714 12770 13100 13206 13326 13472 13631 13635 13677 13714 13737 13789 13917 13945 14020 14069 14103 14523 14558 14582-14583 14764 14768 14815 14829 14903 14925 14937 15007 15014 15054 15071 15154 15203 15211 15244 15299 15543 15592 15917 16111 16291 16296 16304 16605 16610 16693 16756 16767 16781 16885 17069 17109 17589 17598 17636 17658 17741 17745 17796 17810 17924 17956 17991 17994 18018 18066 18077 18123 18168 18175 18185-18186 18201 18315 18327 18375 18379 18429 18479 18510 18653 18680 18901 18935 18939-18940 18949 19034 19041 19206 19214 19224 19362 19379 19550 19729 19807 19830 19847 19903 19917 19927 20033 20127 20171 20270 20273 20359 20436 20715 21143 21181 21230 21377-21378 21791 21800 21817 21826 21865 21960 22357 22555 22557 22588 22696 22789 22850 22859 22921 23038 23078-23079 23087 23184 23213 23217 23229 23233 23242 23247 23271 23291 23420 23496 23705 23957 24070 24145 24166 24226 24388 24862 24910 24954 25040 25063 25465 25511 25726 25959 26078 26144 26155 26284 26355 26444 26580 26703 26723 26742 26796 26802 26950 27067 27183 27207 27541 27605 27645 27729 27872 28004 28075 28080 28146 28247 28276 28297 28313 28319 28374 28377 28414-28415 28426 28454 28460 28490 28531 28554 28612 28660 30074 30137 30394 30545 31055 31075 31373 31384 31515 31604 31674 31693 31787 31855 31955 31990 32131 32143 32196 32288 32380 32401 32426 32513 32602 32605 32760 35695 35743 35820 35828 36026 36106 36159 36625 36667 36712 36761 38862 40318 40327 40478 44487 44541 44645 44868 45049 48115 48374 48426 48430 48483 48563 48629 48688 49094https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/694/A9?format=asciiOpticaldefaultJ/A+A/694/A9/tablea1hMeasurements for d_DLR > 0.2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintZTFZTF namemeta.id;meta.maincharSNIAU namemeta.idcharPhasePhasetime.phasefloatSubtypeSub-typesrc.spTypecharWangTypeWang-typesrc.spTypecharBranchTypeBranch-typesrc.spTypecharvsi6355SiII 6355 Velocity10000km.s**-1spect.dopplerVelocfloate_vsi6355SiII 6355 Vel lower uncertainty10000km.s**-1stat.errorfloatE_vsi6355SiII 6355 Vel upper uncertainty10000km.s**-1stat.error;stat.maxfloatpEW6355SiII 6355 pEW0.1nmspect.line.eqWidthfloate_pEW6355SiII 6355 pEW lower uncertainty0.1nmstat.errorfloatE_pEW6355SiII 6355 pEW higher uncertainty0.1nmstat.error;stat.maxfloatvsi5972? SiII 5972 Velocity10000km.s**-1spect.dopplerVelocfloatnullablee_vsi5972? SiII 5972 Vel lower uncertainty10000km.s**-1stat.errorfloatnullableE_vsi5972? SiII 5972 Vel upper uncertainty10000km.s**-1stat.error;stat.maxfloatnullablepEW5972SiII 5972 pEW0.1nmspect.line.eqWidthfloatl_pEW5972[*] * for upper limit of pEW5972meta.code.errorchare_pEW5972? SiII 5972 pEW lower uncertainty0.1nmstat.errorfloatnullableE_pEW5972? SiII 5972 pEW higher uncertainty0.1nmstat.error;stat.maxfloatnullable_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/694/A9/tablea1sMeasurements for d_DLR < 0.2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPhasePhasetime.phasefloatWangTypeWang-typesrc.spTypecharBranchTypeBranch-typesrc.spTypecharvsi6355SiII 6355 Velocity10000km.s**-1spect.dopplerVelocfloate_vsi6355SiII 6355 Vel lower uncertainty10000km.s**-1stat.errorfloatE_vsi6355SiII 6355 Vel upper uncertainty10000km.s**-1stat.error;stat.maxfloatpEW6355SiII 6355 pEW0.1nmspect.line.eqWidthfloate_pEW6355SiII 6355 pEW lower uncertainty0.1nmstat.errorfloatE_pEW6355SiII 6355 pEW higher uncertainty0.1nmstat.error;stat.maxfloatvsi5972? SiII 5972 Velocity10000km.s**-1spect.dopplerVelocfloatnullablee_vsi5972? SiII 5972 Vel lower uncertainty10000km.s**-1stat.errorfloatnullableE_vsi5972? SiII 5972 Vel upper uncertainty10000km.s**-1stat.error;stat.maxfloatnullablepEW5972SiII 5972 pEW0.1nmspect.line.eqWidthfloatl_pEW5972[*] * for upper limit of pEW5972meta.code.errorchare_pEW5972? SiII 5972 pEW lower uncertainty0.1nmstat.errorfloatnullableE_pEW5972? SiII 5972 pEW higher uncertainty0.1nmstat.error;stat.maxfloatnullable_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.mainZTFZTF namemeta.id;meta.maincharSNIAU namemeta.idcharSubtypeSub-typesrc.spTypechar