J/MNRAS/410/585ivo://CDS.VizieR/J/MNRAS/410/585doi:10.26093/cds/vizier.74100585CDSSilverman J.M.Ganeshalingam M.Li W.Filippenko A.V.Miller A.A.,Poznanski D.2024-07-12T20:15:11Z2011-09-15T09:13:11ZCDS support team

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

cds-question@unistra.frsupernovaephotometryIn this paper, we present and analyse optical photometry and spectra of the extremely luminous and slowly evolving Type Ia supernova (SN Ia) 2009dc, and offer evidence that it is a super-Chandrasekhar mass (SC) SN Ia and thus has a SC white dwarf (WD) progenitor. Optical spectra of SN 2007if, a similar object, are also shown. SN 2009dc had one of the most slowly evolving light curves ever observed for a SN Ia, with a rise time of ~23d and {DELTA}m_15_(B)=0.72mag. We calculate a lower limit to the peak bolometric luminosity of ~2.4x10^43^erg/s, though the actual value is likely almost 40 per cent larger. Optical spectra of SN 2009dc and SN 2007if obtained near maximum brightness exhibit strong CII features (indicative of a significant amount of unburned material), and the post-maximum spectra are dominated by iron-group elements (IGEs). All of our spectra of SN 2009dc and SN 2007if also show low expansion velocities. However, we see no strong evidence in SN 2009dc for a velocity `plateau' near maximum light like the one seen in SN 2007if. The high luminosity and low expansion velocities of SN 2009dc lead us to derive a possible WD progenitor mass of more than 2M_{sun}_ and a 56Ni mass of about 1.4-1.7M_{sun}_.2011MNRAS.410..585Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/410/585CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/410/585https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/410/585http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/410/585https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/410/585https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/410/585http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/410/585GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.367228618189496e-19 4.920466254354166e-19OpticaldefaultJ/MNRAS/410/585/table2Early-time BVRI photometry of SN 2009dcVmag? Johnson V magnitudemagphot.mag;em.opt.VfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBmag? Johnson B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? rms uncertainty on Bmagmagstat.error;phot.mag;em.opt.Bfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatnullableRcmag? Cousins R magnitudemagphot.mag;em.opt.Rfloatnullablee_Rcmag? rms uncertainty on Rcmagmagstat.error;phot.mag;em.opt.RfloatnullableIcmag? Cousins I magnitudemagphot.mag;em.opt.Ifloatnullablee_Icmag? rms uncertainty on Icmagmagstat.error;phot.mag;em.opt.IfloatnullableTelTelescope usedinstr.setupcharJDJulian datedtime.epochdoubleJ/MNRAS/410/585/table4UVOT (aboard Swift) photometry of SN 2009dcJDJulian datedtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFilt[UVM2 UVW1 UVW2 UBV] Filter (1)meta.id;instr.filtercharmagMagnitude in Filtermagphot.magfloate_magrms uncertainty on magmagstat.error;phot.magfloat