J/ApJ/915/121ivo://CDS.VizieR/J/ApJ/915/121doi:10.26093/cds/vizier.19150121CDSPritchard T.A.Bensch K.Modjaz M.Williamson M.Thone C.C.Vinko J.,Bianco F.B.Bostroem K.A.Burke J.Garcia-Benito R.Galbany L.,Hiramatsu D.Howell D.A.Izzo L.Kann D.A.McCully C.Pellegrino C.,de Ugarte Postigo A.Valenti S.Wang X.Wheeler J.C.Xiang D.,Sarneczky K.Bodi A.Cseh B.Tarczay-Nehez D.Kriskovics L.Ordasi A.,Pal A.Szakats R.Vida K.2023-03-20T14:15:39Z2023-01-19T08:50:29ZCDS support team

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

cds-question@unistra.frinfrared-photometryvisible-astronomybroad-band-photometryultraviolet-astronomyspectroscopysupernovaeIn the last decade a number of rapidly evolving transients have been discovered that are not easily explained by traditional supernova models. We present optical and UV data on one such object, SN 2018gep, that displayed a fast rise with a mostly featureless blue continuum around peak, and evolved to develop broad features typical of an SNIc-bl while retaining significant amounts of blue flux throughout its observations. This blue excess is most evident in its near-UV flux, which is over 4 mag brighter than other stripped-envelope supernovae, and is still visible in optical g-r colors. Its fast rise time of t_rise,V_=5.6+/-0.5days puts it squarely in the emerging class of Fast Evolving Luminous Transients, or Fast Blue Optical Transients. With a peak absolute magnitude of Mv=-19.53+/-0.23mag it is on the extreme end of both the rise time and peak magnitude distribution for SNe Ic-bl. These observations are consistent with a simple SN Ic-bl model that has an additional form of energy injection at early times that drives the observed rapid, blue rise. We show that SN 2018gep and the literature SN iPTF16asu have similar photometric and spectroscopic properties and that they overall share many similarities with both SNe Ic-bl and Fast Evolving Transients. Based on our SN 2018gep host galaxy data we derive a number of properties, and we show that the derived host galaxy properties for both SN 2018gep and iPTF16asu are consistent with the SNe Ic-bl and gamma-ray burst/supernova sample while being on the extreme edge of the observed Fast Evolving Transient sample.2021ApJ...915..121Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/915/121CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/617/240 : Oxygen abund. in the GOODS-North field (Kobulnicky+, 2004)J/ApJ/702/226 : Swift/UVOT panchromatic obs. of SN 2008D (Modjaz+, 2009)J/ApJ/747/L5 : R-band observations of PTF 10vgv (Corsi+, 2012)J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)J/A+A/559/A114 : Updated O3N2 and N2 abundance indicators (Marino+, 2013)J/ApJS/213/19 : Optical and near-IR light curves of 64 SNe (Bianco+, 2014)J/ApJ/794/23 : Pan-STARRS1 transients optical photometry (Drout+, 2014)J/AJ/147/99 : Spectroscopy of stripped core-collapse SNe (Modjaz+, 2014)J/A+A/576/A135 : CALIFA DR2 (Garcia-Benito+, 2015)J/A+A/574/A60 : Light curve templates of SNe Ib/c from SDSS (Taddia+, 2015)J/ApJ/819/35 : LCs of four transients from PTF & SNLS (Arcavi+, 2016)J/ApJ/827/90 : Spectroscopy of SNe Ib, IIb and Ic (Liu+, 2016)J/ApJ/832/108 : Spectral properties of Type Ic & Ic-bl SNe (Modjaz+, 2016)J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)J/ApJ/845/85 : Absorption vel. for 21 super-luminous SNe Ic (Liu+, 2017)J/ApJ/851/107 : iPTF 16asu photometry follow-up (Whitesides+, 2017)J/ApJ/860/100 : LCs of 26 hydrogen-poor superluminous SNe (De Cia+, 2018)J/ApJ/855/107 : PMAS Integral-field SN hosts COmpilation (Galbany+, 2018)J/ApJ/852/81 : 17 PS1 superluminous SNe LCs + classif. sp. (Lunnan+, 2018)J/MNRAS/481/894 : Rapidly evolving transients in the DES (Pursiainen+, 2018)J/ApJ/887/169 : UV-Opt light curves of the type Ic SN 2018gep (Ho+, 2019)J/ApJ/876/85 : HST observations for LMC Cepheids (Riess+, 2019)J/MNRAS/482/1545 : Berkeley sample of stripped-envelope SNe (Shivvers+, 2019)J/ApJ/902/86 : Type Ic SN 2020bvc UV to NIR LCs & opt. spectra (Ho+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/915/121https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/915/121http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/915/121https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/915/121https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/915/121http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/915/121GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVOpticalInfrareddefaultJ/ApJ/915/121/table1Photometry of SN 2018geprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[0/162] Internal index identifiermeta.idintMJD[58370.62/58420.56] Modified Julian Datedtime.epochdoubleFiltFilter usedinstr.setup;instr.filtercharmag[15.66/20.43] Observed magnitude in Filtermagphot.magfloate_mag[0.02/0.2] Uncertainty in magmagstat.error;phot.magfloatInstInstrument used (1)instr.setupcharJ/ApJ/915/121/table2Spectroscopic observations of SN2018gep and its host galaxyInstInstrument (2)meta.id;instrcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateYear of the observation (UT)stime.epochf_Dateb = No SN light, only host galaxymeta.codecharJD[2458372.8/2458520.14] Julian Datedtime.epochdoubletVmax[-3.7/144.6] Days with respect to V-band maximum (1)dtime.intervalfloatf_InstFlag on Inst (3)meta.codecharlam1Wavelength lower range in {AA}0.1nmem.wl;stat.minintlam2Wavelength upper range in {AA}0.1nmem.wl;stat.maxintPA[95.3/250]? Position angledegpos.posAngfloatnullableAirmass[1.3/2.2] Airmassobs.airMassfloatSlit[1/2]? Slitarcsecinstr.setupfloatnullableExpExposure timestime.duration;obs.exposurecharFileNameName of the FITS file in subdirectory "sp"; column added by CDSmeta.id;meta.fitscharSpInteractive spectrum plotmeta.ref.urlchar