J/ApJ/895/31ivo://CDS.VizieR/J/ApJ/895/31doi:10.26093/cds/vizier.18950031CDSBostroem K.A.Valenti S.Sand D.J.Andrews J.E.Van Dyk S.D.,Galbany L.Pooley D.Amaro R.C.Smith N.Yang S.Anupama G.C.,Arcavi I.Baron E.Brown P.J.Burke J.Cartier R.Hiramatsu D.,Dastidar R.Derkacy J.M.Dong Y.Egami E.Ertel S.Filippenko A.V.,Fox O.D.Haislip J.Hosseinzadeh G.Howell D.A.Gangopadhyay A.,Jha S.W.Kouprianov V.Kumar B.Lundquist M.Milisavljevic D.,Mccully C.Milne P.Misra K.Reichart D.E.Sahu D.K.Sai H.Singh A.,Smith P.S.Vinko J.Wang X.Wang Y.Wheeler J.C.Williams G.G.,Wyatt S.Zhang J.Zhang X.2022-03-10T07:02:04Z2021-10-04T07:16:29ZCDS support team

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

cds-question@unistra.frsupernovaeinfrared-photometryvisible-astronomybroad-band-photometryWe present the discovery and high-cadence follow-up observations of SN2018ivc, an unusual SNeII that exploded in NGC1068 (D=10.1Mpc). The light curve of SN2018ivc declines piecewise-linearly, changing slope frequently, with four clear slope changes in the first 30days of evolution. This rapidly changing light curve indicates that interaction between the circumstellar material and ejecta plays a significant role in the evolution. Circumstellar interaction is further supported by a strong X-ray detection. The spectra are rapidly evolving and dominated by hydrogen, helium, and calcium emission lines. We identify a rare high-velocity emission-line feature blueshifted at ~7800km/s (in H{alpha}, H{beta}, P{beta}, P{gamma}, HeI, and CaII), which is visible from day 18 until at least day 78 and could be evidence of an asymmetric progenitor or explosion. From the overall similarity between SN2018ivc and SN1996al, the H{alpha} equivalent width of its parent HII region, and constraints from pre-explosion archival Hubble Space Telescope images, we find that the progenitor of SN2018ivc could be as massive as 52 M{odot} but is more likely <12M{odot}. SN2018ivc demonstrates the importance of the early discovery and rapid follow-up observations of nearby supernovae to study the physics and progenitors of these cosmic explosions.2020ApJ...895...31Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/895/31CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AZh/85/794 : UBVRHa photometry on 5 galaxies (Gusev+, 2008)J/ApJ/729/143 : Photometry of type IIn SN 2008am (Chatzopoulos+, 2011)J/ApJ/731/120 : Intrinsic SN Ia light curves (Mandel+, 2011)J/ApJ/736/159 : Photometry monitoring of the SN PTF10vdl (Gal-Yam+, 2011)J/ApJ/742/L18 : Follow-up photometry of the SN IIb PTF 11eon (Arcavi+, 2011)J/ApJ/749/18 : Swift/UVOT observations of 12 nearby SN-Ia (Brown+, 2012)J/ApJ/753/22 : Swift/UVOT observations of SN 2011fe (Brown+, 2012)J/ApJ/781/42 : Optical photometry of SN 2010jl (Ofek+, 2014)J/ApJ/787/29 : VOT photometry of Super-Chandrasekhar mass SNeIa (Brown+, 2014)J/ApJ/789/104 : SNe IIn observations and properties (Ofek+, 2014)J/ApJ/796/L18 : Type Ia supernova 2011de UVOT photometry (Brown, 2014)J/ApJ/805/74 : SN2014J Swift/UVOT light curves (Brown+, 2015)J/ApJ/813/30 : UV-Optical light curves of the SNIa iPTF14bdn (Smitka+, 2015)J/ApJ/821/57 : Photometry of the Type Ib/c SN2013ge (Drout+, 2016)J/ApJ/828/3 : Swift obs. of the superluminous SNI ASASSN-15lh (Brown+, 2016)J/ApJ/836/25 : Swift UVOT light curves of ASASSN-15lh (Margutti+, 2017)J/ApJ/836/232 : Swift-UVOT obs. analysis of 29 SNe Ia (Brown+, 2017)J/ApJ/853/62 : Optical and NIR spectra and LCs of SN2016ija (Tartaglia+, 2018)J/ApJ/860/100 : LCs of 26 hydrogen-poor superluminous SNe (De Cia+, 2018)J/ApJ/882/L15 : SN 2018hna photometry & spectroscopy obs. (Singh+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/895/31https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/895/31http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/895/31https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/895/31https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/895/31http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/895/31GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/895/31/table1Photometric observations of SN 2018ivcrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObs[2018/2019] Observation Date, UTtime.epoch;obsMJD[58435/58666] Modified Julian Date, JD-2400000.5dtime.epochdoublePhase[-9.2/221] Phase, days since eventdtime.phasefloatInstSource/Telescope (1)meta.id;instr.telcharFiltFilter (2)meta.id;instr.filtercharl_mag[<] Limit flag for magmeta.code.errorcharmag[14.2/20.4] Observed magnitude in Filter (2)magphot.magfloate_mag[0.01/1.6]? Uncertainty in mag (3)magstat.error;phot.magfloatnullable