J/ApJ/926/L25ivo://CDS.VizieR/J/ApJ/926/L25doi:10.26093/cds/vizier.19269025CDSTucker M.A.Ashall C.Shappee B.J.Kochanek C.S.Stanek K.Z.,Garnavich P.2024-09-03T20:10:56Z2023-12-21T09:29:25ZCDS support team

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

cds-question@unistra.frsupernovaevisible-astronomyspectroscopyWe present three new spectra of the nearby Type Ia supernova (SNIa) 2011fe covering ~480-850days after maximum light and show that the ejecta undergoes a rapid ionization shift at ~500days after explosion. The prominent FeIII emission lines at ~4600{AA} are replaced with FeI+FeII blends at ~4400{AA} and ~5400{AA}. The ~7300{AA} feature, which is produced by [FeII]+[NiII] at <~400days after explosion, is replaced by broad (~+/-15000km/s) symmetric [CaII] emission. Models predict this ionization transition occurring ~100 days later than what is observed, which we attribute to clumping in the ejecta. Finally, we use the nebular-phase spectra to test several proposed progenitor scenarios for SN 2011fe. Nondetections of H and He exclude nearby nondegenerate companions, [OI] nondetections disfavor the violent merger of two white dwarfs, and the symmetric emission-line profiles favor a symmetric explosion.2022ApJ...926L..25Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/926/L25CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)J/ApJ/733/124 : Cepheids in M101 observed with HST (Shappee+, 2011)J/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)J/other/NewA/20.30 : BVRI light curves of 3 SN (Munari+, 2013)J/A+A/554/A27 : 2011fe spectrophotometric time series (Pereira+, 2013)J/MNRAS/446/3895 : The rising LCs of Type Ia supernovae (Firth+, 2015)J/ApJ/841/48 : UBVR and IR photometry of SN 2011fe (Ia) (Shappee+, 2017)J/A+A/630/A76 : SN2016hnk photometry and spectroscopy (Galbany+, 2019)J/MNRAS/491/2902 : Sub-Chandrasekhar progenitors for Ia SNe (Flors+, 2020)J/MNRAS/493/1044 : Nebular spectra of 111 Type Ia supernovae (Tucker+, 2020)J/ApJ/914/50 : Opt. phot. & GMOS & NIRES sp. of SN2019yvq (Tucker+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/926/L25https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/926/L25http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/926/L25https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/926/L25https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/926/L25http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/926/L25GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/926/L25/table1New LBT MODS spectroscopyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of observation (UT)time.epochnullablePhase[482.6/848.2] Phase relative to t_max_dtime.phasefloatExp[10800/14650] Exposure timestime.duration;obs.exposureintJDJulian Datedtime.epochdoubleFileName of the ASCII file in subdirectory "sp"meta.id;meta.filecharspInteractive MODS spectrum plotmeta.ref.urlcharJ/ApJ/926/L25/fig6Line luminosity limits for H-alpha, HeI5876A, and [OI]6300A (Data behind Figure 6)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPhase[229.6/1016] Phase, rest-frame daysdtime.phasefloatHa[0.59/20] Line luminosity limit, H-alpha, 10^+35^erg/s (1)1e-28Wphys.luminosity;em.line.HalphafloatHeI[0.6/27] Line luminosity limit, HeI5876{AA}, 10^+35^erg/s (1)1e-28Wphys.luminosity;spect.line;stat.maxfloatOI[0.7/13.6] Line luminosity limit, [OI]6300{AA}, 10^+35^erg/s (1)1e-28Wphys.luminosity;spect.line;stat.maxfloat