J/ApJ/923/167ivo://CDS.VizieR/J/ApJ/923/167doi:10.26093/cds/vizier.19230167CDSWang Q.Rest A.Zenati Y.Ridden-Harper R.Dimitriadis G.Narayan G.,Villar V.A.Magee M.R.Foley R.J.Shaya E.J.Garnavich P.Wang L.,Hu L.Bodi A.Armstrong P.Auchettl K.Barclay T.Barentsen G.,Bognar Z.Brimacombe J.Bulger J.Burke J.Challis P.Chambers K.,Coulter D.A.Csornyei G.Cseh B.Deckers M.Dotson J.L.Galbany L.,Gonzalez-Gaitan S.Gromadzki M.Gully-Santiago M.Hanyecz O.,Hedges C.Hiramatsu D.Hosseinzadeh G.Howell D.A.Howell S.B.,Huber M.E.Jha S.W.Jones D.O.Konyves-Toth R.Kalup C.,Kilpatrick C.D.Kriskovics L.Li W.Lowe T.B.Margheim S.McCully C.,Mitra A.Munoz J.A.Nicholl M.Nordin J.Pal A.Pan Y.-C.Piro A.L.,Rest S.Rino-Silvestre J.Rojas-Bravo C.Sarneczky K.Siebert M.R.,Smartt S.J.Smith K.Sodor A.Stritzinger M.D.Szabo R.Szakats R.,Tucker B.E.Vinko J.Wang X.Wheeler J.C.Young D.R.Zenteno A.,Zhang K.Zsidi G.2023-11-03T12:30:16Z2023-07-24T08:55:46ZCDS support team

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

cds-question@unistra.frsupernovaevisible-astronomyspectroscopyultraviolet-astronomyinfrared-photometryWe present the 30 minutes cadence Kepler/K2 light curve of the Type Ia supernova (SN Ia) SN 2018agk, covering approximately one week before explosion, the full rise phase, and the decline until 40 days after peak. We additionally present ground-based observations in multiple bands within the same time range, including the 1 day cadence DECam observations within the first ~5 days after the first light. The Kepler early light curve is fully consistent with a single power-law rise, without evidence of any bump feature. We compare SN 2018agk with a sample of other SNe Ia without early excess flux from the literature. We find that SNe Ia without excess flux have slowly evolving early colors in a narrow range (g-i~-0.20+/-0.20mag) within the first ~10 days. On the other hand, among SNe Ia detected with excess, SN 2017cbv and SN 2018oh tend to be bluer, while iPTF16abc's evolution is similar to normal SNe Ia without excess in g-i. We further compare the Kepler light curve of SN 2018agk with companion- interaction models, and rule out the existence of a typical nondegenerate companion undergoing Roche lobe overflow at viewing angles smaller than 45{deg}.2021ApJ...923..167Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/923/167CatalogResearchIsServedByTAP VizieR generic servicerelated-toIV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)J/ApJ/699/L139 : Spectral parameters of SNe Ia (Wang+, 2009)J/ApJ/749/18 : Swift/UVOT observations of 12 nearby SN-Ia (Brown+, 2012)J/AJ/143/126 : Spectroscopy of 462 nearby Type Ia supernovae (Blondin+, 2012)J/A+A/554/A27 : 2011fe spectrophotometric time series (Pereira+, 2013)J/MNRAS/438/L101 : First month on SN 2013ej (Valenti+, 2014)J/ApJ/795/44 : PS1 SNe Ia (0.02<z<0.7) griz light curves (Rest+, 2014)J/A+A/579/A40 : PESSTO catalog (Smartt+, 2015)J/ApJ/826/56 : HST/WFC3 obs. of Cepheids in SN Ia host gal. (Riess+, 2016)J/ApJ/859/101 : The supernovae Ia Pantheon sample (Scolnic+, 2018)J/ApJ/870/13 : K2 LC alternative analysis of ASASSN-18bt (Shappee+, 2019)J/ApJ/870/L1 : K2 obs. of type Ia supernova SN 2018oh (Dimitriadis+, 2019)J/ApJ/876/85 : HST observations for LMC Cepheids (Riess+, 2019)J/A+A/634/A37 : TURTLS Light curves of ^56^Ni distributions (Magee+, 2020)J/ApJ/902/46 : LCO network light curves of SN Ia 2018gv (Yang+, 2020)J/ApJ/902/47 : ZTF early obs. of type Ia SNe. II. Rise time (Miller+, 2020)J/ApJ/902/48 : ZTF early obs. of type Ia supernovae. III. (Bulla+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/923/167https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/923/167http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/923/167https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/923/167https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/923/167http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/923/167GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVOpticalInfrareddefaultJ/ApJ/923/167/table3Log of spectroscopic observations of SN 2018agkrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[58193.3/58310.3] Modified Julian Datetime.epochdoubleFileNameName of the ASCII file; column added by CDSmeta.id;meta.filecharPhase[-10.6/103.4] Phase (G1)dtime.phasefloatTelTelescopemeta.id;instr.telcharInstInstrumentmeta.id;instrcharExpExposure time(s)stime.duration;obs.exposurecharGrismGrism / Gratinginstr.setupcharWave1[1570/6000] Lower range of wavelength in {AA}0.1nmem.wlintWave2[3180/10885] Upper range of wavelength in {AA}0.1nmem.wlintUnitFlux density unit of the spectrum; column added by CDSmeta.unit;phot.flux.densitycharSpInteractive spectrum plotmeta.ref.urlcharJ/ApJ/923/167/table4Ground-based optical photometry of SN 2018agkrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[58185.5/58272.2] Modified Julian Date of observation (JD-2400000.5)dtime.epochdoublePhase[-18.18/66.25] Phase (G1)dtime.phasefloatBmag[17/20.22]? B-band magnitudemagphot.mag;em.opt.BfloatnullableVmag[16.89/19.3]? V-band magnitudemagphot.mag;em.opt.VfloatnullableRmag[16.6/18]? R-band magnitudemagphot.mag;em.opt.RfloatnullableImag[16.7/18]? I-band magnitudemagphot.mag;em.opt.Ifloatnullablegmag[16.9/22.64]? g-band magnitudemagphot.mag;em.opt.Bfloatnullablermag[16.7/24]? r-band magnitudemagphot.mag;em.opt.Rfloatnullableimag[17/22.6]? i-band magnitudemagphot.mag;em.opt.Ifloatnullablee_Bmag[0.008/0.12]? Uncertainty in Bmagmagstat.error;phot.magfloatnullablee_Vmag[0.009/0.08]? Uncertainty in Vmagmagstat.error;phot.magfloatnullablee_Rmag[0.04/0.12]? Uncertainty in Rmagmagstat.error;phot.magfloatnullablee_Imag[0.06/0.13]? Uncertainty in Imagmagstat.error;phot.magfloatnullablee_gmag[0.002/0.3]? Uncertainty in gmagmagstat.error;phot.magfloatnullablee_rmag[0.007/2.6]? Uncertainty in rmagmagstat.error;phot.magfloatnullablee_imag[0.002/5]? Uncertainty in imagmagstat.error;phot.magfloatnullableTelTelescope/Instrument used (1)instr.setupcharJ/ApJ/923/167/table5Ground-based infrared photometry of SN 2018agkrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[58204.2/58251.02] Modified Julian Date of observation (JD-2400000.5)dtime.epochdoublePhase[0.02/45.65] Phase (G1)dtime.phasefloatHmag[17.2/18.1] H-band magnitudemagphot.mag;em.IR.Hfloate_Hmag[0.06/0.3] Uncertainty in Hmagmagstat.error;phot.magfloatJmag[16.8/18.2] J-band magnitudemagphot.mag;em.IR.Jfloate_Jmag[0.06/0.3] Uncertainty in Jmagmagstat.error;phot.magfloatKmag[16.3/17.6]? K-band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag[0.06/0.2]? Uncertainty in Kmagmagstat.error;phot.magfloatnullableInstInstrument used (SMARTS - "ANDICAM" or NTT - "SOFI")instr.setupcharJ/ApJ/923/167/fig2K2 light curve of SN 2018agkNet[8986.2/11678.4]? Net Countsctphot.count;src.netdoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[3346.53/3413.6]? Time of K2 mid-observation, MJD-50000dtime.epochdoublenullableRaw[6894.4/12975.4]? Raw Countsctphot.countdoublenullableSky[0/12472] Sky Countsctinstr.skyLeveldoublee_Net[14.6/17]? Error in Net countsctstat.error;src.netdoublenullable