J/ApJ/904/156ivo://CDS.VizieR/J/ApJ/904/156doi:10.26093/cds/vizier.19040156CDSPerrefort D.Zhang Y.Galbany L.Wood-Vasey W.M.Gonzalez-Gaitan S.2022-09-02T12:51:15Z2022-04-04T06:52:58ZCDS support team

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

cds-question@unistra.frsupernovaeinfrared-photometryvisible-astronomybroad-band-photometryredshiftedThe use of SNe Ia to measure cosmological parameters has grown significantly over the past two decades. However, there exists a significant diversity in the SN Ia population that is not well understood. Overluminous SN1991T-like and subluminous SN1991bg-like objects are two characteristic examples of peculiar SNe. The identification and classification of such objects is an important step in studying what makes them unique from the remaining SN population. With the upcoming Vera C. Rubin Observatory promising on the order of a million new SNe over a 10 year survey, spectroscopic classifications will be possible for only a small subset of observed targets. As such, photometric classification has become an increasingly important concern in preparing for the next generation of astronomical surveys. Using observations from the Sloan Digital Sky Survey II (SDSS-II) SN Survey, we apply here an empirically based classification technique targeted at the identification of SN1991bg-like SNe in photometric data sets. By performing dedicated fits to photometric data in the rest-frame redder and bluer bandpasses, we classify 16 previously unidentified 91bg-like SNe. Using SDSS-II host galaxy measurements, we find that these SNe are preferentially found in host galaxies with an older average stellar age than the hosts of normal SNe Ia. We also find that these SNe are found at a further physical distance from the center of their host galaxies. We find no statistically significant bias in host galaxy mass or specific star formation rate for these targets.2020ApJ...904..156Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/904/156CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/333 : Sloan Digital Sky Survey-II Supernova Survey (Sako+, 2018)J/AJ/134/973 : SDSS Stripe 82 star catalogs (Ivezic+, 2007)J/AJ/136/2306 : SDSS-II Supernova survey, 2005 (Holtzman+, 2008)J/AJ/135/348 : SDSS-II SNe survey: search and follow-up (Sako+, 2008)J/AJ/135/1766 : Sloan Digital Sky Survey-II supernova survey (Zheng+, 2008)J/AJ/137/4517 : UVOT light curves of supernovae (Brown+, 2009)J/AJ/139/519 : Carnegie supernova project. SNe Ia (Contreras+, 2010)J/ApJS/190/418 : Light curves for 165 SNe (Ganeshalingam+, 2010)J/MNRAS/412/1441 : SNe luminosity functions (Li+, 2011)J/ApJ/738/162 : SN Ia candidates from the SDSS-II SN Survey (Sako+, 2011)J/AJ/142/156 : The CSP (DR2): photometry of SNe Ia (Stritzinger+, 2011)J/ApJ/755/125 : Sample of SNe Ia with z<0.25 from SDSS (Galbany+, 2012)J/AJ/144/17 : SDSS and CSP ugri photo. 9 type Ia supernova (Mosher+, 2012)J/ApJS/203/32 : Machine-learned ASAS Classification Cat. (Richards+, 2012)J/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)J/A+A/552/A124 : SNLS-SDSS SN surveys photometric calibration (Betoule+, 2013)J/ApJ/773/53 : Type Ia SNe spectroscopy by the CSP (Folatelli+, 2013)J/A+A/568/A22 : Joint analysis of the SDSS-II and SNLS SNe Ia (Betoule+, 2014)J/ApJ/795/142 : Defining photometric peculiar SNe Ia (Gonzalez-Gaitan+, 2014)J/ApJ/795/44 : PS1 SNe Ia (0.02<z<0.7) griz light curves (Rest+, 2014)J/AJ/151/33 : UBVRIz light curves of 51 Type II supernovae (Galbany+, 2016)J/AJ/154/211 : The CSP (DR3): photometry of low-z SNe Ia (Krisciunas+, 2017)J/AJ/156/18 : APOGEE DR14:Binary comp. evolved stars (Price-Whelan+, 2018)J/ApJ/859/101 : The supernovae Ia Pantheon sample (Scolnic+, 2018)J/A+A/630/A76 : SN2016hnk photometry and spectroscopy (Galbany+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/904/156https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/904/156http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/904/156https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/904/156https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/904/156http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/904/156GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/904/156/table3 (Parameters listed for fit results of the Salt 2.4 model to SDSS SNe.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/904/156/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/904/156/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/904/156/table3?GETtext/xml+votable180.050000true327.43497805560.65756888890.0055555555555555565/4437-4438 4441-4442 4453-4454 4456-4458 4460 4499 4501-4502 4504-4506 4517-4518 4521-4522 4693-4694 4696-4698 4708-4710 4713-4714 4716 4720 4756-4758 4761-4762 4773-4774 4777-4778 5786 5797-5798 5800-5802 7509-7510 7513-7514 9215 6/0-2 12288-12290 17405-17407 17661-17663 17725-17727 17741-17743 17745-17747 17756-17758 17761-17763 17772-17774 17776-17778 17805-17807 17809-17811 17820-17822 17836-17838 17856-17858 17860 17981-17983 18001-18003 18012-18014 18028-18030 18032-18034 18061-18063 18065-18067 18076-18078 18081-18083 18092-18094 18096-18098 18112-18114 18176-18178 18685-18687 18749-18751 18759 18763 18765-18767 18769-18771 18780-18782 18796-18798 18800-18802 18829-18831 18844-18846 18849-18851 18860-18862 19005-19007 19021-19023 19036-19038 19041-19043 19052-19054 19056-19058 19085-19087 19089-19091 19100-19102 19105-19107 19116-19118 19120-19122 19136-19138 19200-19202 19456-19458 23101-23103 23138-23139 23142 23150 23181-23183 23185-23187 23196-23198 23212-23214 23216-23218 23232-23234 30013-30015 30029-30031 30033-30035 30044-30046 30049-30051 30060-30062 30064-30066 30098-30102 30105 30108-30109 30144-30146 49149-49151https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/904/156?format=asciiOpticalInfrareddefaultJ/ApJ/904/156/table3Parameters listed for fit results of the Salt 2.4 model to SDSS SNe.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCID[679/22284] Object Identifier, Sako+, 2018, II/333meta.id;meta.mainintprimaryz[0/2.16]? Redshift (1)src.redshiftfloatnullablee_z[0/0.9]? Uncertainty in z (1)stat.error;src.redshiftfloatnullablet0[53606/54444]? time of B-band maximum, MJDdtime.epochdoublenullablee_t0[0/20]? Uncertainty in t0dstat.errorfloatnullablec[-0.5/0.5]? color parameter (1)phot.color.reddFreefloatnullablee_c[0/1]? Uncertainty in cstat.errorfloatnullablex1[-5/5]? stretch parameter (1)stat.fit.paramfloatnullablee_x1[0/10]? Uncertainty in x1stat.errorfloatnullableE(B-V)[0.01/0.36]? Milky Way extinction (2)magphot.color.excessfloatnullablechisq[7.78/6209152]? Reduced {chi}^2stat.fit.chi2doublenullablendof[8/230]? Number, degrees of freedomstat.fit.dof;phys.atmol.numberfloatnullableBmax[-25.99/21.02]? B-band maximum magnitudemagphot.mag;em.opt.B;stat.maxfloatnullableDMB15[0.17/3.26]? Light-curve parameter stretchmagstat.fit.paramfloatnullableFitFitted parameters (table2)meta.numberintnullable_RAPosition from Sako et al., 2018, II/333 (right ascension part)degpos.eq.ra;meta.mainnullable_DEPosition from Sako et al., 2018, II/333 (declination part)degpos.eq.dec;meta.mainnullableJ/ApJ/904/156/table2Fitted parameters listed for combination of models and band-pass collectionsCID[679/22284] Object Identifier, Sako+, 2018, II/333meta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintbandFitting band (1)instr.bandpasscharmodelModel fit (2)meta.id;stat.fitcharz[0/0.99]? Redshift (3)src.redshiftfloatnullablee_z[0/0.4]? Uncertainty in z (3)stat.error;src.redshiftfloatnullablet0[53606/54444]? time of B-band maximum, MJDdtime.epochdoublenullablee_t0[0/20]? Uncertainty in t0dstat.errorfloatnullablec[0/1]? color parameter (4)phot.color.reddFreefloatnullablee_c[0/1]? Uncertainty in cstat.errorfloatnullablex1[-0.5/1.25]? stretch parameter (5)stat.fit.paramfloatnullablee_x1[0/1]? Uncertainty in x1stat.errorfloatnullableE(B-V)[0.01/0.36]? Milky Way extinction (6)magphot.color.excessfloatnullablechisq[0.0/1732708.82]? Reduced {chi}^2stat.fit.chi2doublenullablendof[-2.0/240.0]? Number, degrees of freedomstat.fit.dof;phys.atmol.numberfloatnullableBmax[-35.97/43.23]? B-band maximum magnitudemagphot.mag;em.opt.B;stat.maxfloatnullableDMB15[0.52/2.49]? Light-curve parameter stretchmagstat.fit.paramfloatnullableJ/ApJ/904/156/table1Objects identified in the SDSS SN Survey as being potentially peculiar objectsCID[4524/20208] Object Identifier, Sako+, 2018, II/333meta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClassSimilar supernovae classificationsrc.classcharJ/ApJ/904/156/table4*Classification coordinatesCID[2778/21898] Object Identifier, Sako+, 2018, II/333meta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintxBand[-20/12.3]? Photometric bandpass similarity SN91gbinstr.bandpassfloatnullableyBand[-33.3/15.9]? Photometric bandpass similarity SN91gbinstr.bandpassfloatnullablexColl[3.25/33.7] collective red/blue set similarity SN91gbstat.fit.paramfloatyColl[0.2/138] collective red/blue set similarity to SN91gbstat.fit.paramfloatJ/ApJ/904/156/table5Comparison of objects classified as anomaliesNdata[1/8] Number of datasetsmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCID[1706/20266] Object Identifier, Sako+, 2018, II/33Ameta.id;meta.mainintPSNIDCandidate PSNID type, Sako+, 2018, II/333meta.idcharx[-47.91/2.16] similarity coordinatepos.framefloaty[-27.26/0.97] similarity coordinatepos.framefloatClassClass (1)src.classchar