J/ApJ/875/136ivo://CDS.VizieR/J/ApJ/875/136doi:10.26093/cds/vizier.18750136CDSVan Dyk S.D.Zheng W.Maund J.R.Brink T.G.Srinivasan S.,Andrews J.E.Smith N.Leonard D.C.Morozova V.Filippenko A.V.,Conner B.Milisavljevic D.de Jaeger T.Long K.S.Isaacson H.,Crossfield I.J.M.Kosiarek M.R.Howard A.W.Fox O.D.Kelly P.L.,Piro A.L.Littlefair S.P.Dhillon V.S.Wilson R.Butterley T.,Yunus S.Channa S.Jeffers B.T.Falcon E.Ross T.W.Hestenes J.C.,Stegman S.M.Zhang K.Kumar S.2021-03-29T09:03:35Z2020-10-12T09:37:06ZCDS support team

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

cds-question@unistra.frsupernovaeinfrared-photometryvisible-astronomyWide-band photometryspectroscopyWe present extensive optical photometric and spectroscopic observations, from 4 to 482 days after explosion, of the Type II-plateau (II-P) supernova (SN) 2017eaw in NGC 6946. SN 2017eaw is a normal SN II-P intermediate in properties between, for example, SN 1999em and SN 2012aw and the more luminous SN 2004et, also in NGC6946. We have determined that the extinction to SN 2017eaw is primarily due to the Galactic foreground and that the SN site metallicity is likely subsolar. We have also independently confirmed a tip-of-the-red-giant-branch (TRGB) distance to NGC 6946 of 7.73+/-0.78Mpc. The distances to the SN that we have also estimated via both the standardized candle method and expanding photosphere method corroborate the TRGB distance. We confirm the SN progenitor identity in pre-explosion archival Hubble Space Telescope (HST) and Spitzer Space Telescope images, via imaging of the SN through our HST Target of Opportunity program. Detailed modeling of the progenitor's spectral energy distribution indicates that the star was a dusty, luminous red supergiant consistent with an initial mass of ~15M_{sun}_.2019ApJ...875..136Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/875/136CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)B/hst : HST Archived Exposures Catalog (STScI, 2007)J/A+A/442/281 : Late-type giants BVRIJHKL & Teff (Kucinskas+, 2005)J/MNRAS/372/1315 : UBVRI photometry of SN 2004et (Sahu+, 2006)J/MNRAS/395/1409 : Type II-P SN progenitor constraints (Smartt+, 2009)J/ApJ/705/1364 : MIR catalog of point sources in M33 (Thompson+, 2009)J/ApJS/190/418 : Light curves for 165 SNe (Ganeshalingam+, 2010)J/MNRAS/412/1441 : SNe luminosity functions (Li+, 2011)J/A+A/532/A54 : GRAMS carbon-star model grid (Srinivasan+, 2011)J/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)J/MNRAS/433/1871 : UBVRI griz light curves of SN 2012aw (Bose+, 2013)J/A+A/553/A24 : Models for rotating stars (Georgy+, 2013)J/MNRAS/442/844 : BVRI light curves of type II-P supernovae (Faran+, 2014)J/ApJ/791/105 : SNe progenitor masses (Williams+, 2014)J/ApJ/799/215 : 26 type II-Plateau supernovae parameters (Pejcha+, 2015)J/MNRAS/449/1876 : Photometric observations of SN PTF11iqb (Smith+, 2015)J/ApJ/826/56 : HST/WFC3 obs. of Cepheids in SN Ia host gal. (Riess+, 2016)J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)J/ApJ/859/73 : Variability of RSGs in M31 from iPTF (Soraisam+, 2018)J/ApJ/860/39 : HST obs. of nearby core-collapse SNe (Williams+, 2018)J/MNRAS/487/832 : BVRI photometry of the Type II-P SN 2017eaw (Buta+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/875/136https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/875/136http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/875/136https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/875/136https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/875/136http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/875/136GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap3.9193497546148093e-20 6.185923063528282e-20OpticalInfrareddefaultJ/ApJ/875/136/table2Log of optical spectroscopy of SN 2017eawrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT of the observation datestime.epoch;obsnullableMJD[57890.9/58367.9] Modified Julian Datedtime.epochdoubleAge[5.2/482.1] SN Age in days (1)dtime.agefloatInstSpectrograph used for the observationmeta.id;instrcharlambdaSpectral wavelength range in Angstroms0.1nminstr.bandwidth;em.wlcharResSpectral resolution in Angstroms0.1nmspect.resolutioncharSpInteractive plot of spectrummeta.ref.urlcharJ/ApJ/875/136/table3Log of Spitzer data covering the SN 2017eaw siterecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT of the observation datetime.epoch;obsnullableAORKEYUnique Spitzer observation identifiermeta.id;obs.param;obsintDataSpitzer instruments and channels (1)meta.id;instrcharJ/ApJ/875/136/table5Photometry of the SN 2017eaw progenitorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInstHST or Spitzer camera or Instrument (1)meta.notecharBandFilter band (HST) or Instrument channelinstr.bandpass;instr.filtercharDate1UT observation date (2)time.epoch;obsnullableDate2UT observation date (2)time.epoch;obsnullablel_magLimit flag on magmeta.code.errorcharmag[10.39/26.4] Observed brightness in Bandmagphot.magfloate_mag[0.01/0.05]? Uncertainty in magmagstat.error;phot.magfloatnullableJ/ApJ/875/136/fig2The BVRI and unfiltered light curves of SN 2017eawDateUT Datestime.epochnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian datedtime.epochdoubleBmag[13.13/18.19]? Apparent B band magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag[0.01/0.3]? The 1{sigma} uncertainty in Bmagmagstat.error;phot.magfloatnullableVmag[12.84/16.71]? Apparent V band magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag[0.01/0.16]? The 1{sigma} uncertainty in Vmagmagstat.error;phot.magfloatnullablemag[12.49/15.59]? Apparent KAIT unfiltered magnitudemagphot.mag;em.optfloatnullablee_mag[0.01/0.06]? The 1{sigma} uncertainty in Unfiltmagmagstat.error;phot.magfloatnullableRmag[12.44/15.46]? Apparent R band magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag[0.01/0.06]? The 1{sigma} uncertainty in Rmagmagstat.error;phot.magfloatnullableImag[12.19/14.79]? Apparent I band magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag[0.01/0.08]? The 1{sigma} uncertainty in Imagmagstat.error;phot.magfloatnullableTelTelescope on which observation was obtained (1)meta.id;instr.telcharJ/ApJ/875/136/fig3Sequence of Kast, MMT, and Bok spectra of SN 2017eaw (36 observation dates)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of observation (from 2017-05-17.402 to 2018-09-06.316)stime.epoch;obsnullableInstInstrument (MMT, Kast or Bok) (1)meta.id;instrcharFilt[RV] Recalibration filter (2)meta.notecharlambda[3245/10720] Rest Wavelength in Angstroms0.1nmem.wldoubleFlux[6.78e-22/4.51e-14]? Flux in erg/cm2/s/Angstrom (2)cW.m**-2.nm**-1phot.fluxdoublenullableJ/ApJ/875/136/fig15*Expansion velocity evolution of SN 2017eawrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAge[5.2/149.9] Age of SN 2017eawdtime.agefloatvHa[5220/12988] H-alpha expansion velocity absorption featurekm/sphys.veloc.expansion;spect.lineinte_vHa[71/1090] Uncertainty in vHalphakm/sstat.errorintvHeI[10297/10320]? HeI 5876{AA} expansion velocity absorption linekm/sphys.veloc.expansion;spect.lineintnullablee_vHeI[20/58]? Uncertainty in vHeIkm/sstat.errorintnullablevFeII4924[2404/5221]? FeII 4924{AA} expansion velocity absorption linekm/sphys.veloc.expansion;spect.lineintnullablee_vFeII4924[49/216]? Uncertainty in the vFeII4924km/sstat.errorintnullablevFeII5018[2770/7943]? FeII 5018{AA} expansion velocity absorption linekm/sphys.veloc.expansion;spect.lineintnullablee_vFeII5018[38/196]? Uncertainty in the vFeII5018km/sstat.errorintnullablevFeII5169[2289/7973]? FeII 5169{AA} expansion velocity absorption linekm/sphys.veloc.expansion;spect.lineintnullablee_vFeII5169[47/200]? Uncertainty in the vFeII5169km/sstat.errorintnullableJ/ApJ/875/136/fig21Apparent brightness of the SN 2017eaw progenitor in the Spitzer 3.6{mu}m and 4.5{mu}m bands over ~12.9yr prior to explosionMJDModified Julian Datedtime.epochcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintYear[0.1/12.93] Years before SN 2017eaw explosion (JD 2457885.7)yrtime.intervalfloat3.6magP[17.75/18.26]? Magnitude of Progenitor in Spitzer/IRAC Ch1 (3.6um)magphot.mag;em.IR.3-4umfloatnullablee_3.6magP[0.03/0.08]? Uncertainty in 3.6magP (1)magstat.errorfloatnullable4.5magP[17.55/18.08]? Magnitude of Progenitor in Spitzer/IRAC Ch2 (4.5um)magphot.mag;em.IR.4-8umfloatnullablee_4.5magP[0.04/0.15]? Uncertainty in 4.5magP (1)magstat.errorfloatnullable3.6magO1[17.35/18.09]? Object 1 Spitzer/IRAC Ch1 magnitude (3.6um) (2)magphot.mag;em.IR.3-4umfloatnullablee_3.6magO1[0.03/0.07]? Uncertainty in 3.6magO1 (1)magstat.errorfloatnullable4.5magO1[17.68/18.38]? Object 1 Spitzer/IRAC Ch2 magnitude (4.5um) (2)magphot.mag;em.IR.4-8umfloatnullablee_4.5magO1[0.05/0.17]? Uncertainty in 4.5mag01 (1)magstat.errorfloatnullable3.6magO2[17.21/19.06]? Object 2 Spitzer/IRAC Ch1 magnitude (3.6um) (2)magphot.mag;em.IR.3-4umfloatnullablee_3.6magO2[0.03/0.14]? Uncertainty in 3.6magO2 (1)magstat.errorfloatnullable4.5magO2[17.35/18.8]? Object 2 Spitzer/IRAC Ch2 magnitude (4.5um) (2)magphot.mag;em.IR.4-8umfloatnullablee_4.5magO2[0.04/0.14]? Uncertainty in 4.5mag02 (1)magstat.errorfloatnullableComm? Comments on Detection of Progenitormeta.note;instr.saturationcharJ/ApJ/875/136/table1Photometric sequence around SN 2017eawrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarPhotometric sequence star in Figure 1 (1)meta.bib.figcharBmag[14.78/18.49] The B band magnitude (2)magphot.mag;em.opt.BfloatVmag[14.13/17.39] The V band magnitude (2)magphot.mag;em.opt.VfloatRmag[13.75/16.76] The R band magnitude (2)magphot.mag;em.opt.RfloatImag[13.33/16.12] The I band magnitude (2)magphot.mag;em.opt.Ifloat