J/ApJ/923/L8ivo://CDS.VizieR/J/ApJ/923/L8doi:10.26093/cds/vizier.19239008CDSJiang J.-A.Maeda K.Kawabata M.Doi M.Shigeyama T.Tanaka M.,Tominaga N.Nomoto K.Niino Y.Sako S.Ohsawa R.Schramm M.,Yamanaka M.Kobayashi N.Takahashi H.Nakaoka T.Kawabata K.S.,Isogai K.Aoki T.Kondo S.Mori Y.Arimatsu K.Kasuga T.,Okumura S.-I.Urakawa S.Reichart D.E.Taguchi K.Arima N.,Beniyama J.Uno K.Hamada T.2023-10-03T13:21:22Z2023-08-02T09:56:14ZCDS support team

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

cds-question@unistra.frsupernovaeinfrared-photometryvisible-astronomyWide-band photometryultraviolet-astronomyspectroscopyIn this Letter we report a discovery of a prominent flash of a peculiar overluminous Type Ia supernova, SN 2020hvf, in about 5hr of the supernova explosion by the first wide-field mosaic CMOS sensor imager, the Tomo-e Gozen Camera. The fast evolution of the early flash was captured by intensive intranight observations via the Tomo-e Gozen high-cadence survey. Numerical simulations show that such a prominent and fast early emission is most likely generated from an interaction between 0.01M_{sun}_ circumstellar material (CSM) extending to a distance of ~10^13^cm and supernova ejecta soon after the explosion, indicating a confined dense CSM formation at the final evolution stage of the progenitor of SN 2020hvf. Based on the CSM-ejecta interaction-induced early flash, the overluminous light curve, and the high ejecta velocity of SN 2020hvf, we suggest that the SN 2020hvf may originate from a thermonuclear explosion of a super-Chandrasekhar-mass white dwarf ("super-M_Ch_ WD"). Systematical investigations on explosion mechanisms and hydrodynamic simulations of the super-M_Ch_ WD explosion are required to further test the suggested scenario and understand the progenitor of this peculiar supernova.2021ApJ...923L...8Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/923/L8CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)J/ApJ/607/810 : Companions to isolated elliptical galaxies (Madore+, 2004)J/MNRAS/410/585 : SN 2009dc BVRI light curves (Silverman+, 2011)J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)J/AJ/146/86 : Cosmicflows-2 catalog (CF2) (Tully+, 2013)J/A+A/634/A37 : TURTLS Light curves of ^56^Ni distributions (Magee+, 2020)J/A+A/675/A195 : ZTF DR11 classif. in ZTF/4MOST sky (Sanchez-Saez+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/923/L8https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/923/L8http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/923/L8https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/923/L8https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/923/L8http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/923/L8GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap3.377399441402775e-19 1.2058628298368645e-18UVOpticalInfrareddefaultJ/ApJ/923/L8/table1Ground-based optical/NIR imaging observations of SN 2020hvfHmag[12.2/14.4]? H-band Vega magnitude (2)magphot.mag;em.IR.Hfloatnullablee_Hmag[0.03/0.3]? Uncertainty in Hmagmagstat.error;phot.magfloatnullableKsmag[11.8/14.7]? Ks-band Vega magnitude (2)magphot.mag;em.IR.Kfloatnullablee_Ksmag[0.02/0.4]? Uncertainty in Ksmagmagstat.error;phot.magfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObs[2020] UT Observation date, yearstime.epoch;obsPhase[-19.2/75.2] Phase, relative to 2020-May-9.8047 (G1)dtime.intervaldoubleTelTelescope code (1)meta.code;instr.telintCmag[13.26/17.65]? Tomo-e non-filter "Clear" AB magnitude (2)magphot.mag;em.optfloatnullablee_Cmag[0.03/0.3]? Uncertainty in Cmag (3)magstat.error;phot.magfloatnullableBmag[12.6/16.4]? B-band Vega magnitude (2)magphot.mag;em.opt.Bfloatnullablee_Bmag[0.02/0.2]? Uncertainty in Bmagmagstat.error;phot.magfloatnullableVmag[12.6/16.2]? V-band Vega magnitude (2)magphot.mag;em.opt.Vfloatnullablee_Vmag[0.02/0.1]? Uncertainty in Vmagmagstat.error;phot.magfloatnullableRmag[12.6/16]? R-band Vega magnitude (2)magphot.mag;em.opt.Rfloatnullablee_Rmag[0.03/0.07]? Uncertainty in Rmagmagstat.error;phot.magfloatnullableImag[12.8/16]? I-band Vega magnitude (2)magphot.mag;em.opt.Ifloatnullablee_Imag[0.04/0.08]? Uncertainty in Imagmagstat.error;phot.magfloatnullableJmag[12.2/14.82]? J-band Vega magnitude (2)magphot.mag;em.IR.Jfloatnullablee_Jmag[0.03/0.2]? Uncertainty in Jmagmagstat.error;phot.magfloatnullableJ/ApJ/923/L8/table2Swift/UVOT observations of SN 2020hvfrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObs[2020] UT Observation date, yearstime.epoch;obsPhase[-17.6/66] Phase, relative to 2020-May-9.8047 (G1)dtime.intervalfloatUVW2mag[13.6/17.7]? Swift/UVOT UVW2 Vega magnitudemagphot.mag;em.UVfloatnullablee_UVW2mag[0.05/0.2]? Uncertainty in UVW2magmagstat.error;phot.magfloatnullableUVM2mag[13.2/18]? Swift/UVOT UVM2 Vega magnitudemagphot.mag;em.UVfloatnullablee_UVM2mag[0.06/0.2]? Uncertainty in UVM2magmagstat.error;phot.magfloatnullableUVW1mag[12.5/17.2]? Swift/UVOT UVW1 Vega magnitudemagphot.mag;em.UVfloatnullablee_UVW1mag[0.05/0.3]? Uncertainty in UVW1magmagstat.error;phot.magfloatnullableUmag[11.9/16.6]? Swift/UVOT U-band Vega magnitudemagphot.mag;em.opt.Ufloatnullablee_Umag[0.04/0.1]? Uncertainty in Umagmagstat.error;phot.magfloatnullableBmag[12.68/17.2]? Swift/UVOT B-band Vega magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag[0.04/0.2]? Uncertainty in Bmagmagstat.error;phot.magfloatnullableVmag[12.6/16.8]? Swift/UVOT V-band Vega magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag[0.03/0.2]? Uncertainty in Vmagmagstat.error;phot.magfloatnullableJ/ApJ/923/L8/listList of spectra; table added by CDSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelTelescope/Instrumentmeta.notecharObs[2020] UT Observation date, yeartime.epoch;obsPhase[-16/10] Phase, relative to 2020-May-9.8 (G1)dtime.intervalintFileNameName of the ASCII file in subdirectory "sp"meta.id;meta.filecharspInteractive plot of the spectrummeta.ref.urlchar