J/ApJ/960/88ivo://CDS.VizieR/J/ApJ/960/88CDSSiebert M.R.Kwok L.A.Johansson J.Jha S.W.Blondin S.Dessart L.,Foley R.J.Hillier D.J.Larison C.Pakmor R.Temim T.Andrews J.E.,Auchettl K.Badenes C.Barna B.Bostroem K.A.Brenner Newman M.J.,Brink T.G.Bustamante-Rosell M.J.Camacho-Neves Y.Clocchiatti A.,Coulter D.A.Davis K.W.Deckers M.Dimitriadis G.Dong Y.Farah J.,Filippenko A.V.Flors A.Fox O.D.Garnavich P.Padilla Gonzalez E.,Graur OrHambsch F.-J.Hosseinzadeh G.Howell D.A.Hughes J.P.,Kerzendorf W.E.Le Saux X.K.Maeda K.Maguire K.McCully C.,Mihalenko C.Newsome M.O'Brien J.T.Pearson J.Pellegrino C.,Pierel J.D.R.Polin A.Rest A.Rojas-Bravo C.Sand D.J.Schwab M.,Shahbandeh M.Shrestha M.Smith N.Strolger L.-G.Szalai T.,Taggart K.Terreran G.Terwel J.H.Tinyanont S.Valenti S.Vinko J.,Wheeler J.C.Yang YiZheng W.Ashall C.DerKacy J.M.Galbany L.,Hoeflich P.Hsiao E.de Jaeger T.Lu J.Maund J.Medler K.,Morrell N.Shappee B.J.Stritzinger M.Suntzeff N.Tucker M.Wang L.2026-04-14T13:35:35Z2026-04-14T13:29:24ZCDS support team

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

cds-question@unistra.frsupernovaephotometryvisible-astronomyspectroscopyinfrared-astronomyNebular-phase observations of peculiar Type Ia supernovae (SNe Ia) provide important constraints on progenitor scenarios and explosion dynamics for both these rare SNe and the more common, cosmologically useful SNe Ia. We present observations from an extensive ground- and space-based follow-up campaign to characterize SN 2022pul, a super-Chandrasekhar mass SN Ia (alternatively "03fg-like" SN), from before peak brightness to well into the nebular phase across optical to mid-infrared (MIR) wavelengths. The early rise of the light curve is atypical, exhibiting two distinct components, consistent with SN Ia ejecta interacting with dense carbon-oxygen (C/O)-rich circumstellar material (CSM). In the optical, SN 2022pul is most similar to SN2012dn, having a low estimated peak luminosity (M_B_=-18.9mag) and high photospheric velocity relative to other 03fg-like SNe. In the nebular phase, SN 2022pul adds to the increasing diversity of the 03fg-like subclass. From 168 to 336 days after peak B-band brightness, SN 2022pul exhibits asymmetric and narrow emission from [OI]{lambda}{lambda}6300,6364 (FWHM~2000km/s), strong, broad emission from [CaII]{lambda}{lambda}7291,7323 (FWHM~7300km/s), and a rapid FeIII to FeII ionization change. Finally, we present the first ever optical-to-MIR nebular spectrum of an 03fg-like SN Ia using data from JWST. In the MIR, strong lines of neon and argon, weak emission from stable nickel, and strong thermal dust emission (with T~500K), combined with prominent [OI] in the optical, suggest that SN 2022pul was produced by a white dwarf merger within C/O-rich CSM.2024ApJ...960...88Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/960/88CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/282 : The SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)J/MNRAS/410/585 : SN 2009dc BVRI light curves (Silverman+, 2011)J/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)J/AJ/146/86 : Cosmicflows-2 catalog (Tully+, 2013)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)J/A+A/621/A60 : Bright nearby elliptical gal. Xshooter sp. (Francois+, 2019)J/ApJ/900/140 : CSP-II: sp. of the 03fg-like SN Ia LSQ14fmg (Hsiao+, 2020)J/ApJ/896/165 : Optical light curves of SN 2016hnk (Jacobson-Galan+, 2020)J/MNRAS/494/4426 : Effect of host galaxies on SN luminosity (Smith+, 2020)J/ApJ/923/L8 : Follow-up phot. & sp. of SNIa 2020hvf (Jiang+, 2021)J/ApJ/927/78 : Follow-up of type Ia SN2020esm (Dimitriadis+, 2022)J/ApJ/938/L22 : UV & opt. phot. & spectra of Type Ia SN2011aa (Dutta+, 2022)J/ApJ/926/L25 : New LBT/MODS spectra of type Ia SN 2011fe (Tucker+, 2022)J/ApJ/958/173 : Kast and LRIS spectra of SNIa SN 2020hvf (Siebert+, 2023)J/ApJ/943/L20 : Phot. obs. of SN 2022ilv and SN 2020hvf (Srivastav+, 2023)http://www.wiserep.org/ : WISeREP homepagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/960/88https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/960/88http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/960/88https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/960/88https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/960/88http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/960/88GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/960/88/table2Log of ground-based photometry of SN 2022pulrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceData source identifier (1)meta.idcharMJD[59786.7/60133.1] Modified Julian Datedtime.epochdoubleFiltFilter used (B,V,R,I,g,r,i,c or o)instr.setup;instr.filtercharmag[11.9/19.91] Apparent magnitude in Filtermagphot.magfloate_mag[0/0.2] Uncertainty in magmagstat.error;phot.magfloatJ/ApJ/960/88/table3Log of spectroscopic observations of SN 2022pulrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelTelescopemeta.id;instr.telcharInstInstrumentmeta.id;instrcharMJD[59790.4/60144.2] Modified Julian Datedtime.epochfloatPhase[-17/336] Phasedtime.phaseintlam1Wavelength lower range in Angstrom0.1nmem.wl;stat.minintlam2Wavelength upper range in Angstrom0.1nmem.wl;stat.maxintFileName of the spectrum in subdirectory "sp"; column added by CDSmeta.id;meta.filecharspInteractive spectrum plotmeta.ref.urlchar