J/MNRAS/446/3895ivo://CDS.VizieR/J/MNRAS/446/3895doi:10.26093/cds/vizier.74463895CDSFirth R.E.Sullivan M.Gal-Yam A.Howell D.A.Maguire K.Nugent P.,Piro A.L.Baltay C.Feindt U.Hadjiyksta E.McKinnon R.Ofek E.,Rabinowitz D.Walker E.S.2024-08-14T20:19:15Z2017-11-13T11:37:25ZCDS support team

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

cds-question@unistra.frsupernovaephotometryredshiftedWe present an analysis of the early, rising light curves of 18 Type Ia supernovae (SNe Ia) discovered by the Palomar Transient Factory and the La Silla-QUEST variability survey. We fit these early data flux using a simple power law (f(t)={alpha}xt^n^) to determine the time of first light (t_0_), and hence the rise time (t_rise_) from first light to peak luminosity, and the exponent of the power-law rise (n). We find a mean uncorrected rise time of 18.98+/-0.54 d, with individual supernova (SN) rise times ranging from 15.98 to 24.7 d. The exponent n shows significant departures from the simple `fireball model' of n=2 (or f(t){prop.to}t^2^) usually assumed in the literature. With a mean value of n=2.44+/-0.13, our data also show significant diversity from event to event. This deviation has implications for the distribution of ^56^Ni throughout the SN ejecta, with a higher index suggesting a lesser degree of ^56^Ni mixing. The range of n found also confirms that the ^56^Ni distribution is not standard throughout the population of SNe Ia, in agreement with earlier work measuring such abundances through spectral modelling. We also show that the duration of the very early light curve, before the luminosity has reached half of its maximal value, does not correlate with the light-curve shape or stretch used to standardize SNe Ia in cosmological applications. This has implications for the cosmological fitting of SN Ia light curves.2015MNRAS.446.3895Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/446/3895CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)II/313 : Palomar Transient Factory (PTF) photometric catalog 1.0J/MNRAS/444/3258 : Velocities and EW of PTF SNe Ia (Maguire+, 2014)J/ApJS/219/13 : SNe Ia light curves for the LSQ-CSP sample (Walker+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/446/3895https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/446/3895http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/446/3895https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/446/3895https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/446/3895http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/446/3895GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/446/3895/sn (List of SNe Ia in this catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/446/3895/sn?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/446/3895/sn?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/446/3895/sn?GETtext/xml+votable180.050000true53.3420833-4.99866670.0055555555555555566/2509 8300 9631 10379 10466 10838 11044 11434 18854 21010 23075 26791 27418 27929 35961 36225 36452 36682https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/446/3895?format=asciiOpticaldefaultJ/MNRAS/446/3895/snList of SNe Ia in this catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNSN identifier (PTF YYaaaa, LSQ YYaaa)meta.id;meta.maincharRAJ2000Simbad Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad Degree of Declination (J2000)pos.eq.dec;meta.mainFilterFilter used for the observationinstr.setup;instr.filtercharLCLight curvemeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/446/3895/table2Full SNe Ia datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNSN identifier (PTF YYaaaa, LSQ YYaaa)meta.id;meta.maincharFilterFilter used for the observationinstr.setup;instr.filtercharMJDModified Julian Date of observationdtime.epochdoubleCtsObserved countsctphot.count;em.X-raydoublee_CtsUncertainty in Ctsctstat.errorfloatZPmag[27.0] Zero-point AB magnitudemagphot.mag;arith.zpfloatzRedshiftsrc.redshiftdoublee_zUncertainty in zstat.error;src.redshiftfloat