J/A+A/614/A134ivo://CDS.VizieR/J/A+A/614/A134doi:10.26093/cds/vizier.36140134CDSBalland C.Cellier-Holzem F.Lidman C.Astier P.Betoule M.,Carlberg R.G.Conley A.Ellis R.S.Guy J.Hardin D.Hook I.M.,Howell D.A.Pain R.Pritchet C.J.Regnault N.Sullivan M.,Arsenijevic V.Baumont S.El-Hage P.Fabbro S.Fouchez D.Mitra A.,Moeller A.Mourao A.M.Neveu J.Roman M.Ruhlmann-Kleider V.2020-04-06T11:15:38Z2018-09-06T14:13:05ZCDS support team

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

cds-question@unistra.frsurveyssupernovaevisible-astronomyspectroscopystellar-spectral-typesWe aim to present 70 spectra of 68 new high-redshift type Ia supernovae (SNe Ia) measured at ESO's VLT during the final two years of operation (2006-2008) of the Supernova Legacy Survey (SNLS). This new sample complements the VLT three year spectral set. Altogether, these two data sets form the five year sample of SNLS SN Ia spectra measured at the VLT on which the final SNLS cosmological analysis will partly be based. In the redshift range considered, this sample is unique in terms of homogeneity and number of spectra. We use it to investigate the possibility of a spectral evolution of SNe Ia populations with redshift as well as SNe Ia spectral properties as a function of lightcurve fit parameters and the mass of the host-galaxy. Reduction and extraction are based on both IRAF standard tasks and our own reduction pipeline. Redshifts are estimated from host-galaxy lines whenever possible or alternatively from supernova features. We used the spectro-photometric SN Ia model SALT2 combined with a set of galaxy templates that model the host-galaxy contamination to assess the type Ia nature of the candidates. We identify 68 new SNe Ia with redshift ranging from z=0.207 to z=0.98 for an average redshift of z=0.62. Each spectrum is presented individually along with its best-fit SALT2 model. Adding this new sample to the three year VLT sample of SNLS, the final dataset contains 209 spectra corresponding to 192 SNe Ia identified at the VLT. We also publish the redshifts of other candidates (host galaxies or other transients) whose spectra were obtained at the same time as the spectra of live SNe Ia. This list provides a new redshift catalog useful for upcoming galaxy surveys. Using the full VLT SNe Ia sample, we build composite spectra around maximum light with cuts in color, the lightcurve shape parameter ("stretch"), host-galaxy mass and redshift. We find that high-z SNe Ia are bluer, brighter and have weaker intermediate mass element absorption lines than their low-z counterparts at a level consistent with what is expected from selection effects. We also find a flux excess in the range [3000-3400]{AA} for SNe Ia in low mass host-galaxies (M<10^10^M_{sun}_) or with locally blue U-V colors, and suggest that the UV flux (or local color) may be used in future cosmological studies as a third standardization parameter in addition to stretch and color.2018A&A...614A.134Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/614/A134CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://supernovae.in2p3.fr/Snls5VltRelease : Snls5Vlt Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/614/A134https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/614/A134http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/614/A134https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/614/A134https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/614/A134http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/614/A134GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/614/A134/tablea3 (Catalog of redshifts and identifications of the non-SN Ia objects measured in MOS mode at the VLT during the SNLS survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/614/A134/tablea3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/614/A134/tablea3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/614/A134/tablea3?GETtext/xml+votable180.050000true36.4625417-4.64405560.005555555555555556Cone search capability for table J/A+A/614/A134/tablea12 (Observing log (table A1) and spectral properties (table A2) of the VLT SNe Ia of the last two years of SNLS Simbad)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/614/A134/tablea12?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/614/A134/tablea12?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/614/A134/tablea12?GETtext/xml+votable180.050000true36.9458333-4.03252780.0055555555555555565/6814 6/17683 17686 17689 17692 48478-48479 48500-48501https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/614/A134?format=asciiOpticaldefaultJ/A+A/614/A134/tablea3Catalog of redshifts and identifications of the non-SN Ia objects measured in MOS mode at the VLT during the SNLS surveyzRedshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSNLS SN name (when relevant)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainn_z[*] * for redshift obtained from a single identified linemeta.notecharIDIdentification (1)meta.notecharJ/A+A/614/A134/tablea12Observing log (table A1) and spectral properties (table A2) of the VLT SNe Ia of the last two years of SNLS SimbadphiPhasetime.phasefloate_zrms uncertainty on zstat.error;src.redshiftfloatr_z[HS] Source of xmeta.ref;pos.framecharModelHHost modelmeta.id;stat.fitcharFracHHost fractionphys.luminosity;arith.ratiofloatExpTimeExposure timestime.duration;obs.exposurecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSNLS SN namemeta.id;meta.maincharn_NameNote on Name (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainObs.dateSpectrum observation date (UTC)time.epoch;obsnullableSeeing? Seeingarcsecinstr.obsty.seeingfloatnullablen_Seeing[f] f: Seeing not available for this objectmeta.notecharAirmassAir massobs.airMassfloatimagMagnitude at observation time (iM)magphot.mag;em.opt.Ifloatn_imag[e] e: Value obtained from online logsmeta.notecharTypeSN type (1)src.classcharzRedshfit, not corrected to the heliocentric reference frame, computed in 5{AA} binssrc.redshiftfloat<S/N>Mean signal-to-noise ratio, computed in 5{AA} binsstat.snr;stat.meanfloatspShow the spectrummeta.ref.urlcharFileNameName of the spectrum file in subdirectory spmeta.id;meta.filecharSimbadSimbad column added by the CDSmeta.ref.urlchar