J/ApJ/900/140ivo://CDS.VizieR/J/ApJ/900/140doi:10.26093/cds/vizier.19000140CDSHsiao E.Y.Hoeflich P.Ashall C.Lu J.Contreras C.Burns C.R.,Phillips M.M.Galbany L.Anderson J.P.Baltay C.Baron E.Castellon S.,Davis S.Freedman W.L.Gall C.Gonzalez C.Graham M.L.Hamuy M.,Holoien T.W.-S.Karamehmetoglu E.Krisciunas K.Kumar S.,Kuncarayakti H.Morrell N.Moriya T.J.Nugent P.E.Perlmutter S.,Persson S.E.Piro A.L.Rabinowitz D.Roth M.Shahbandeh M.,Shappee B.J.Stritzinger M.D.Suntzeff N.B.Taddia F.Uddin S.A.2022-05-18T13:09:28Z2022-02-02T11:46:02ZCDS support team

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

cds-question@unistra.frsupernovaevisible-astronomyspectroscopyinfrared-photometrybroad-band-photometryThe Type Ia supernova (SN Ia) LSQ14fmg exhibits exaggerated properties that may help to reveal the origin of the "super-Chandrasekhar" (or 03fg-like) group. The optical spectrum is typical of a 03fg-like SNIa, but the light curves are unlike those of any SNe Ia observed. The light curves of LSQ14fmg rise extremely slowly. At -23 rest-frame days relative to B-band maximum, LSQ14fmg is already brighter than M_V_=-19mag before host extinction correction. The observed color curves show a flat evolution from the earliest observation to approximately 1 week after maximum. The near-infrared light curves peak brighter than -20.5mag in the J and H bands, far more luminous than any 03fg-like SNe Ia with near-infrared observations. At 1 month past maximum, the optical light curves decline rapidly. The early, slow rise and flat color evolution are interpreted to result from an additional excess flux from a power source other than the radioactive decay of the synthesized 56Ni. The excess flux matches the interaction with a typical superwind of an asymptotic giant branch (AGB) star in density structure, mass-loss rate, and duration. The rapid decline starting at around 1 month past B-band maximum may be an indication of rapid cooling by active carbon monoxide (CO) formation, which requires a low-temperature and high-density environment. These peculiarities point to an AGB progenitor near the end of its evolution and the core degenerate scenario as the likely explosion mechanism for LSQ14fmg.2020ApJ...900..140Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/900/140CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/96/269 : Stellar Models from 0.8 to 120 Msolar (Schaller+, 1992)J/A+AS/98/523 : Grids of stellar models. II. (Schaerer+ 1993)J/A+AS/101/415 : Grids of stellar models III. (Charbonnel+ 1993)J/A+AS/141/371 : Low-mass stars evolutionary tracks (Girardi+, 2000)J/AJ/139/120 : Low-redshift Type-Ia supernovae (Folatelli+, 2010)J/AJ/139/519 : Carnegie supernova project. SNe Ia (Contreras+, 2010)J/MNRAS/404/1639 : MILES base models & new line index system (Vazdekis+, 2010)J/MNRAS/410/585 : SN 2009dc BVRI light curves (Silverman+, 2011)J/ApJS/200/12 : CfA4: light curves for 94 type Ia SNe (Hicken+, 2012)J/ApJ/773/53 : Type Ia SNe spectroscopy by the CSP (Folatelli+, 2013)J/A+A/554/A27 : 2011fe spectrophotometric time series (Pereira+, 2013)J/A+A/559/A114 : Updated O3N2 and N2 abundance indicators (Marino+, 2013)J/ApJ/787/29 : UVOT phot. of Super-Chandrasekhar mass SNe Ia (Brown+, 2014)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/ApJ/795/142 : Defining phot. peculiar SNe Ia (Gonzalez-Gaitan+, 2014)J/AJ/154/211 : The CSP (DR3): phot. of low-z SNe Ia (Krisciunas+, 2017)J/A+A/602/A85 : SN 1998bw MUSE datacube (Kruehler+, 2017)J/ApJ/855/107 : PMAS Integral-field SN hosts COmpilation (Galbany+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/900/140https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/900/140http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/900/140https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/900/140https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/900/140http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/900/140GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapAssociated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/ApJ/900/140OpticalInfrareddefaultJ/ApJ/900/140/table1Swope+e2v photometry of LSQ14fmg in the natural systemrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[56925.15/56996.1] Modified Julian Datedtime.epochdoubleBmag[17.5/21]? B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag[0.008/0.08]? Uncertainty on the Bmagmagstat.error;phot.magfloatnullableVmag[17.3/20.2]? V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag[0.008/0.05]? Uncertainty on the Vmagmagstat.error;phot.magfloatnullablermag[17.25/19.5]? r-band magnitudemagphot.mag;em.opt.Rfloatnullablee_rmag[0.008/0.025]? Uncertainty on the rmagmagstat.error;phot.magfloatnullableimag[17.2/20.1]? i-band magnitudemagphot.mag;em.opt.Ifloatnullablee_imag[0.01/0.2]? Uncertainty on the imagmagstat.error;phot.magfloatnullableJ/ApJ/900/140/table4Journal of spectroscopic observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation date (UT)time.epoch;obsnullableMJD[56924.9/56943.1] Modified Julian Datedtime.epochdoubleInstTelescope+InstrumentinstrchartmaxB[-13.4/3.6] Rest-frame days relative to B-band maximumdtime.epochfloatFileNameName of the FITS file in subdirectory "sp/"; column added by CDSmeta.id;meta.fitscharfitsDownload the FITS filemeta.ref.urlcharSpInteractive spectrum plotmeta.ref.urlchar