J/ApJ/934/102ivo://CDS.VizieR/J/ApJ/934/102doi:10.26093/cds/vizier.19340102CDSDong Y.Valenti S.Polin A.Boyle A.Flors A.Vogl C.,Kerzendorf W.E.Sand D.J.Jha S.W.Wyrzykowski L.Bostroem K.A.,Pearson J.McCully C.Andrews J.E.Benetti S.Blondin S.Galbany L.,Gromadzki M.Hosseinzadeh G.Howell D.A.Inserra C.Jencson J.E.,Lundquist M.Lyman J.D.Magee M.Maguire K.Meza N.Srivastav S.,Taubenberger S.Terwel J.H.Wyatt S.Young D.R.2024-11-06T20:26:10Z2024-08-14T07:18:03ZCDS support team

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

cds-question@unistra.frsupernovaeinfrared-photometryvisible-astronomyphotometryspectroscopyinfrared-astronomyA thermonuclear explosion triggered by a He-shell detonation on a carbon-oxygen white-dwarf core has been predicted to have strong UV line blanketing at early times due to the iron-group elements produced during He-shell burning. We present the photometric and spectroscopic observations of SN 2016dsg, a subluminous peculiar Type I supernova consistent with a thermonuclear explosion involving a thick He shell. With a redshift of 0.04, the i-band peak absolute magnitude is derived to be around -17.5. The object is located far away from its host, an early-type galaxy, suggesting it originated from an old stellar population. The spectra collected after the peak are unusually red, show strong UV line blanketing and weak OI{lambda}7773 absorption lines, and do not evolve significantly over 30 days. An absorption line around 9700-10500{AA} is detected in the near-infrared spectrum and is likely from the unburnt He in the ejecta. The spectroscopic evolution is consistent with the thermonuclear explosion models for a sub-Chandrasekhar-mass white dwarf with a thick He shell, while the photometric evolution is not well described by existing models.2022ApJ...934..102Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/934/102CatalogResearchIsServedByTAP VizieR generic servicerelated-toVII/259 : 6dF galaxy survey final redshift release (Jones+, 2009)J/A+A/523/A48 : Gaia photometry (Jordi+, 2010)J/MNRAS/438/L101 : First month on SN 2013ej (Valenti+, 2014)J/A+A/579/A40 : PESSTO catalog (Smartt+, 2015)J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)J/A+A/630/A76 : SN2016hnk photometry and spectroscopy (Galbany+, 2019)J/ApJ/905/58 : The local universe. I. Ca-rich gap transients (De+, 2020)J/ApJ/896/165 : Optical light curves of SN 2016hnk (Jacobson-Galan+, 2020)J/ApJ/898/56 : UVOT, ZTF gri LCs & sp. of the SN Ia 2019yvq (Miller+, 2020)J/A+A/652/A76 : Gaia Photometric Science Alerts (Hodgkin+, 2021)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/934/102https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/934/102http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/934/102https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/934/102https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/934/102http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/934/102GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/934/102/table1Spectroscopic observations of SN 2016dsgspInteractive spectrum plotmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of observationtime.epoch;obsnullableJDJulian date of observationdtime.epochdoublePhase[4.7/54.2] Phase with respect to the discovery date (2016 February 21 = JD2457440.02)dtime.phasefloatTelTelescope (NTT, FTS or SALT)meta.id;instr.telcharInstInstrumentmeta.id;instrcharResResolution {lambda}/{Delta}{lambda}pos.angResolutioncharlambdaWavelength range in {AA}0.1nmem.wlcharFileName1Name of the original spectrum in subdirectory "sp"; column added by CDSmeta.id;meta.maincharFileName2Name of the flux-calibrated spectrum in subdirectory "sp"; column added by CDSmeta.idcharFileName3Name of the FITS spectrum in subdirectory "fits"; column added by CDSmeta.id;meta.fitscharJ/ApJ/934/102/tablea1Optical photometry of SN 2016dsgObs[2016] Observation date, yeartime.epoch;obsJDJulian Date of observationdtime.epochdoublePhase[4.69/58.5] Days since the discovery date (JD=2457440.02)dtime.phasedoubleomag[18.4/22.2] Apparent Magnitude in Filtermagphot.magfloate_omag[0.05/0.5] Error in omagmagstat.error;phot.magfloatFiltFilter (V, g, r or i)meta.id;instr.filtercharTelTelescope used to take the data (1)instr.setupcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint