J/ApJ/886/152ivo://CDS.VizieR/J/ApJ/886/152doi:10.26093/cds/vizier.18860152CDSYao Y.Miller A.A.Kulkarni S.R.Bulla M.Masci F.J.Goldstein D.A.,Goobar A.Nugent P.Dugas A.Blagorodnova N.Neill J.D.Rigault M.,Sollerman J.Nordin J.Bellm E.C.Cenko S.B.De K.Dhawan S.,Feindt U.Fremling C.Gatkine P.Graham M.J.Graham M.L.Ho A.Y.Q.,Hung T.Kasliwal M.M.Kupfer T.Laher R.R.Perley D.A.Rusholme B.,Shupe D.L.Soumagnac M.T.Taggart K.Walters R.Yan L.2022-05-19T07:06:19Z2021-05-12T09:32:33ZCDS support team

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

cds-question@unistra.frsupernovaephotometryvisible-astronomyextinctionEarly-time observations of Type Ia supernovae (SNe Ia) are essential to constrain the properties of their progenitors. In this paper, we present high-quality light curves of 127 SNe Ia discovered by the Zwicky Transient Facility (ZTF) in 2018. We describe our method to perform forced point-spread function photometry, which can be applied to other types of extragalactic transients. With a planned cadence of six observations per night (three g + three r), all of the 127 SNe Ia are detected in both g and r bands more than 10 days (in the rest frame) prior to the epoch of g-band maximum light. The redshifts of these objects range from z=0.0181 to 0.165; the median redshift is 0.074. Among the 127 SNe, 50 are detected at least 14 days prior to maximum light (in the rest frame), with a subset of nine objects being detected more than 17 days before g-band peak. This is the largest sample of young SNe Ia collected to date; it can be used to study the shape and color evolution of the rising light curves in unprecedented detail. We discuss six peculiar events in this sample: one 02cx-like event ZTF18abclfee (SN2018crl), one Ia-CSM SN ZTF18aaykjei (SN2018cxk), and four objects with possible super-Chandrasekhar mass progenitors: ZTF18abhpgje (SN2018eul), ZTF18abdpvnd (SN2018dvf), ZTF18aawpcel (SN2018cir), and ZTF18abddmrf (SN2018dsx).2019ApJ...886..152Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/886/152CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)J/AJ/137/3731 : ESSENCE high-redshift supernova (Foley+, 2009)J/ApJ/700/331 : Light curves of type Ia supernovae (CfA3) (Hicken+, 2009)J/ApJ/716/712 : HST light curves of six SNe and Union2 (Amanullah+, 2010)J/AJ/139/519 : Carnegie supernova project. SNe Ia (Contreras+, 2010)J/ApJS/190/418 : Light curves for 165 SNe (Ganeshalingam+, 2010)J/A+A/526/A28 : SDSS-II supernovae NTT and NOT spectroscopy (Oestman+, 2011)J/AJ/142/156 : The CSP (DR2): photometry of SNe Ia (Stritzinger+, 2011)J/AJ/143/126 : Spectroscopy of 462 nearby Type Ia SNe (Blondin+, 2012)J/ApJS/200/12 : CfA4: light curves for 94 type Ia SNe (Hicken+, 2012)J/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)J/A+A/568/A22 : Joint analysis of the SDSS-II & SNLS SNe Ia (Betoule+, 2014)J/MNRAS/446/3895 : The rising light curves of Type Ia supernovae (Firth+, 2015)J/ApJ/826/56 : HST/WFC3 obs. of Cepheids in SN Ia host gal. (Riess+, 2016)J/AJ/154/211 : The CSP (DR3): photometry of low-z SNIa (Krisciunas+, 2017)J/ApJ/870/L1 : K2 obs. of type Ia supernova SN 2018oh (Dimitriadis+, 2019)J/ApJ/870/13 : K2 LC alternative analysis of ASASSN-18bt (Shappee+, 2019)http://www.wis-tns.org/ : Transient Name Server (TNS) home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/886/152https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/886/152http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/886/152https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/886/152https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/886/152http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/886/152GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/886/152/sample (General information and photometric properties of 127 SNe Ia (Tables 2 and 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/886/152/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/886/152/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/886/152/sample?GETtext/xml+votable180.050000true214.202079758.48540860.0055555555555555566/2615 5622 9052 9067 9170 9178 9204-9205 9212 9223 9239 9268 9326 9361 9386 9424 9430 9470 9489 9520 9540 9564-9565 9608 9619 9639 9644 9678 9706 9726 9759 9768 9793 9808 9811 9824 9840 9971 10000 10004 10044 10060 10074-10075 10092 10112 10120 10154 10159 10175 10187 10200 10210 10595 10619 10637 10674 10710 10717 10728 10873 10944 11046 11109 11186 11199 11204 11222 11267 11269 11273 11297 11333 11385 11409 11451 11505 11534 11548 11551 11584 11614-11615 11619 11643 11668 11670 11685 11796 12037 12118 12124 12776 14526 14858 14874 14896 14973 15007 15018 15050 15054 15068 15070 15235 15258 15270-15271 15299 15308 15338 15349 15932 16060 16074 16079 16102 20223 32380 32486 32498 32520 32614 32670https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/886/152?format=asciiOpticaldefaultJ/ApJ/886/152/sampleGeneral information and photometric properties of 127 SNe Ia (Tables 2 and 3)n_zNote on z (3)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNpNumber of photometric measurements for this SNIa (link to Table 5)meta.numberintnullableZTFZTF Namemeta.id;meta.maincharprimaryRAJ2000[12.52/348.53] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[21.38/79.06] Declination (J2000)degpos.eq.dec;meta.mainNameSN IAU name from the Transient Name Server (TNS)meta.idcharTNSTNS Internal Name, indicating the discovery groupmeta.idcharTelFollowup telescope(s) (1)instr.telcharPhaseSpectroscopic phase(s) at followup (1)time.phasecharSubtypeIa Subtype ("SC"=super-Chandrasekhar)src.classcharu_Subtype[*] Uncertainty flag on Ia Subtype (2)meta.notecharz[0.018/0.17] Host galaxy redshiftsrc.redshiftfloatE(B-V)[0.006/0.12] Forground Galactic extinction from Schlafly & Finkbeiner (2011ApJ...737..103S)magphot.color.excessfloattgmax[58243.79/58396.52] Epoch of g-band maximum light, Modified Julian Date (4)dtime.epochdoublee_tgmax[0/1.5] Uncertainty in tgmaxdstat.errorfloatDelm15g[0.4/1.7]? Decline within 15d from maximum in g band (4)magsrc.var.amplitudefloatnullablee_Delm15g[0/0.1]? Uncertainty in Delm15gmagstat.errorfloatnullablex1[-2.6/4.2] Light curve shape parameter, x1, from SALT2 fitting (salt2x1)stat.fit.paramfloate_x1[0/1.1] Uncertainty in x1stat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharc[-0.2/0.7] Light curve color, c, from SALT2 fitting (salt2c)stat.fit.paramfloate_c[0/0.2] Uncertainty in cstat.errorfloatLCInteractive LC plotmeta.ref.urlcharJ/ApJ/886/152/table5P48 photometry of 127 SNe IaqID[1/4] Quadrant (CCD-amplifier) identifier (from 1 to 4) (2)meta.id;instrintFilt[1/2] Filter identifier (1=g_ZTF_, 2=r_ZTF_) (filterid) (2)meta.id;instr.filterintSeeing[1.19/4] Photometric seeing (FWHM) at the Palomar Observatory at the time of observationarcsecinstr.obsty.seeingfloatZP[22.63/28.64] Photometric zero-pointmagphot.mag;arith.zpdoublee_ZP[5.3e-7/0.018] ZP uncertainty (zp_unc)magstat.errordoubleFlux[-3728/19044] Forced PSF-fit flux for the difference image (DN units) (fmcmc) (3)phot.flux.densityfloate_Flux[11/710] Flux uncertainty (fmcmc_unc)stat.error;phot.fluxfloatC[-999/200.3] History offset in the baseline region (DN units) (4)instr.baseline;arith.difffloatChi2[-999/3.3] Square root of the reduced chi-square statistics (chi2_nu) (4)stat.fit.chi2floatJDJulian Datedtime.epochdoubleindexedZTFZTF name of the supernovameta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPID[1/3] Program identifier (programid) (1)meta.id;obsintField[584/1824] ZTF field identifier (fieldid) (2)meta.id;obs.fieldintCCD[1/16] CCD identifier (from 1 to 16) (ccdid) (2)meta.id;instr.detint