J/PASP/122/1ivo://CDS.VizieR/J/PASP/122/1doi:10.26093/cds/vizier.61220001CDSZhang T.Wang X.Li W.Filippenko A.V.Wang L.Zhou X.Brown P.J.,Silverman J.M.Steele T.N.Ganeshalingam M.Li J.Deng J.Li T.,Qiu Y.Zhai M.Shang R.2025-09-09T14:13:43Z2010-05-06T12:48:12ZCDS support team

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

cds-question@unistra.frsupernovaeinfrared-photometryvisible-astronomybroad-band-photometryWe present optical photometry and spectra for the Type Ia supernova (SN Ia) 2007gi in the nearby galaxy NGC 4036. SN 2007gi is characterized by extremely high-velocity (HV) features of the intermediate-mass elements (Si, Ca, and S), with expansion velocities (v_exp_) approaching 15500km/s near-maximum brightness (compared to 10600km/s for SNe Ia with normal v_exp_). SN 2007gi reached a B-band peak magnitude of 13.25+/-0.04mag with a decline rate of {DELTA}m15(B)(true)=1.33+/-0.09mag. The B-band light curve of SN 2007gi demonstrated an interesting two-stage evolution during the nebular phase, with a decay rate of 1.16+/-0.05mag/(100days) during t=60-90days and 1.61+/-0.04mag/(100days) thereafter. Such behavior was also observed in the HV SN Ia 2006X, and might be caused by the interaction between supernova ejecta and circumstellar material (CSM) around HV SNe Ia. Based on a sample of a dozen well-observed R band (or unfiltered) light curves of SNe Ia, we confirm that the HV events may have a faster rise time to maximum than those with normal v_exp_.2010PASP..122....1Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/122/1CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/122/1https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/122/1http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/122/1https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/122/1https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/122/1http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/122/1GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/PASP/122/1/table1Magnitudes of photometric standards in the SN 2007gi fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar sequential numbermeta.recordintVmagJohnson V magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatB-VJohnson B-V colour indexmagphot.color;em.opt.B;em.opt.Vfloate_B-Vrms uncertainty on B-Vmagstat.error;phot.color;em.opt.BfloatU-BJohnson U-B colour indexmagphot.color;em.opt.U;em.opt.Bfloate_U-Brms uncertainty on U-Bmagstat.error;phot.color;em.opt.UfloatV-RcJohnson-Cousins V-Rc colour indexmagphot.color;em.opt.V;em.opt.Rfloate_V-Rcrms uncertainty on V-Rcmagstat.error;phot.color;em.opt.VfloatV-IcJohnson-Cousins V-Ic colour indexmagphot.color;em.opt.V;em.opt.Ifloate_V-Icrms uncertainty on V-Icmagstat.error;phot.color;em.opt.VfloatJ/PASP/122/1/table2Optical photometry of SN 2007girecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT Datetime.epochcharJDJulian datedtime.epochdoublePhasePhase, relative to the epoch of B-band maximum (JD 2454327.02)dtime.epochfloatBmagJohnson B magnitudemagphot.mag;em.opt.Bfloate_Bmagrms uncertainty on Bmagmagstat.error;phot.mag;em.opt.BfloatVmagJohnson V magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatRcmag? Cousins R magnitudemagphot.mag;em.opt.Rfloatnullablee_Rcmag? rms uncertainty on Rmagmagstat.error;phot.mag;em.opt.RfloatnullableIcmag? Cousins I magnitudemagphot.mag;em.opt.Ifloatnullablee_Icmag? rms uncertainty on Imagmagstat.error;phot.mag;em.opt.Ifloatnullable