J/ApJ/930/127ivo://CDS.VizieR/J/ApJ/930/127doi:10.26093/cds/vizier.19300127CDSGangopadhyay A.Misra K.Hosseinzadeh G.Arcavi I.Pellegrino C.,Wang X.Andrew Howell D.Burke J.Zhang J.Kawabata K.Singh M.,Dastidar R.Hiramatsu D.McCully C.Mo J.Chen Z.Xiang D.2024-11-06T20:25:17Z2024-05-06T12:18:22ZCDS support team

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

cds-question@unistra.frsupernovaevisible-astronomyspectroscopyWe present a high-cadence short term photometric and spectroscopic monitoring campaign of a type Ibn SN 2019wep, which is one of the rare SN Ibn after SNe 2010al and 2019uo to display signatures of flash ionization (HeII, CIII, NIII). We compare the decline rates and rise time of SN 2019wep with other SNe Ibn and fast transients. The post-peak decline in all bands (0.1mag/day) are consistent with SNe Ibn but less than the fast transients. On the other hand, the {Delta}m_15_ values are slightly lower than the average values for SNe Ibn but consistent with the fast transients. The rise time is typically shorter than SNe Ibn but longer than fast transients. SN2019wep lies at the fainter end of SNe Ibn but possesses an average luminosity among the fast transients sample. The peculiar color evolution places it between SNe Ib and the most extreme SNe Ibn. The bolometric light-curve modeling shows resemblance with SN 2019uo with ejecta masses consistent with SNe Ib. SN 2019wep belongs to the P cygni subclass of SNe Ibn and shows faster evolution in line velocities as compared to the emission subclass. The post-maximum spectra show close resemblance with ASASSN-15ed hinting it to be of SNIb nature. The low HeI CSM velocities and residual H{alpha} further justifies it and provide evidence of an intermittent progenitor between Wolf-Rayet and LBV stars.2022ApJ...930..127Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/930/127CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/416/3138 : SN 2009jf light curves (Valenti+, 2011)J/ApJ/769/39 : SN Ibn PS1-12sk optical & NIR light curves (Sanders+, 2013)J/A+A/555/A10 : Light curves of 5 type IIn supernovae (Taddia+, 2013)J/ApJ/794/23 : Pan-STARRS1 transients optical photometry (Drout+, 2014)J/AJ/147/99 : Spectroscopy of stripped core-collapse SNe (Modjaz+, 2014)J/MNRAS/438/L101 : First month on SN 2013ej (Valenti+, 2014)J/MNRAS/449/1921 : UV/opt/NIR photometry for Type Ibn SNe (Pastorello+, 2015)J/MNRAS/453/3649 : Photometric data for ASASSN-15ed (Pastorello+, 2015)J/MNRAS/449/1941 : Opt/NIR photometry of OGLE-2012-SN-006 (Pastorello+, 2015)J/ApJ/819/35 : LCs of four transients from PTF & SNLS (Arcavi+, 2016)J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)J/MNRAS/481/894 : Rapidly evolving transients in the DES (Pursiainen+, 2018)J/A+A/637/A73 : Type IIn supernova photometry (Nyholm+, 2020)J/ApJ/918/63 : Fast-transients confirmed by ZTFReST & LCs (Andreoni+, 2021)J/ApJ/907/99 : Pre-explosion light curve of supernovae (Strotjohann+, 2021)J/ApJ/917/97 : Spectroscopic obs. of type Ibn ASASSN-14ms (Wang+, 2021)J/ApJ/910/42 : LCs and spectroscopic obs. of AT2018cow (Xiang+, 2021)J/other/Nat/601.201 : Photometry of SN 2019hgp (Gal-Yam+, 2022)J/ApJ/926/125 : Fast-evolving SNIbn with LCO & FLOYDS (Pellegrino+, 2022)J/ApJ/927/180 : Type Icn SN2021csp photometry & spectra (Perley+, 2022)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/930/127https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/930/127http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/930/127https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/930/127https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/930/127http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/930/127GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/930/127/table2Log of spectroscopic observations of SN 2019weprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPhase[-2.9/18.3] Phase, measured with respect to V-max (MJD_max_=58828.5)time.phasefloatTelTelescope code (G1)meta.code;instr.telcharInstInstrumentmeta.id;instrcharRangeWavelength range in Angstroms0.1nminstr.bandwidthcharDateObservation date (UT) as in fig6.dat; column added by CDStime.epoch;obs;meta.mainnullableprimaryNfNumber of flux measurements at this date (link to Fig 6)meta.numberintnullablespInteractive spectrum plotmeta.ref.urlcharJ/ApJ/930/127/fig6Spectra of SN 2019weprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation date (UT)time.epoch;obs;meta.mainnullableprimaryindexedTelTelescope code (G1)meta.code;instr.telcharlambda[3411.18/9757.13] Wavelength; Angstroms0.1nmem.wldoubleFlux[-1.2e-15/7.7e-15] Flux; erg/s/cm^2^/AngstromcW.m**-2.nm**-1phot.fluxdouble