J/ApJ/854/L14ivo://CDS.VizieR/J/ApJ/854/L14doi:10.26093/cds/vizier.18549014CDSKuncarayakti H.Maeda K.Ashall C.J.Prentice S.J.Mattila S.,Kankare E.Fransson C.Lundqvist P.Pastorello A.Leloudas G.,Anderson J.P.Benetti S.Bersten M.C.Cappellaro E.Cartier R.,Denneau L.Della Valle M.Elias-Rosa N.Folatelli G.Fraser M.,Galbany L.Gall C.Gal-Yam A.Gutierrez C.P.Hamanowicz A.Heinze A.,Inserra C.Kangas T.Mazzali P.Melandri A.Pignata G.Rest A.,Reynolds T.Roy R.Smartt S.J.Smith K.W.Sollerman J.Somero A.,Stalder B.Stritzinger M.Taddia F.Tomasella L.Tonry J.Weiland H.,Young D.R.2018-02-19T09:01:54Z2018-02-19T09:43:18ZCDS support team

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

cds-question@unistra.frsupernovaevisible-astronomysloan-photometryspectroscopySN 2017dio shows both spectral characteristics of a type-Ic supernova (SN) and signs of a hydrogen-rich circumstellar medium (CSM). Prominent, narrow emission lines of H and He are superposed on the continuum. Subsequent evolution revealed that the SN ejecta are interacting with the CSM. The initial SN Ic identification was confirmed by removing the CSM interaction component from the spectrum and comparing with known SNe Ic, and reversely, adding a CSM interaction component to the spectra of known SNe Ic and comparing them to SN 2017dio. Excellent agreement was obtained with both procedures, reinforcing the SN Ic classification. The light curve constrains the pre-interaction SN Ic peak absolute magnitude to be around Mg=-17.6mag. No evidence of significant extinction is found, ruling out a brighter luminosity required by a SN Ia classification. These pieces of evidence support the view that SN 2017dio is a SN Ic, and therefore the first firm case of a SN Ic with signatures of hydrogen-rich CSM in the early spectrum. The CSM is unlikely to have been shaped by steady-state stellar winds. The mass loss of the progenitor star must have been intense, dM/dt~0.02({epsilon}_Ha_/0.01)^-1^*(v_wind_/500km/s)* (v_shock_/10000km/s)^-3^M_{sun}_/yr, peaking at a few decades before the SN. Such a high mass loss rate might have been experienced by the progenitor through eruptions or binary stripping.2018ApJ...854L..14Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/854/L14CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/854/L14https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/854/L14http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/854/L14https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/854/L14https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/854/L14http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/854/L14GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap7.952274030004205e-20 6.090060298487514e-19OpticaldefaultJ/ApJ/854/L14/s170619Spectrum on 2017-06-19recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaSpectrum wavelength0.1nmem.wldoubleFluxSpectrum flux (in erg/cm^2^/s/{AA})0.01W.m**-2.nm**-1phot.fluxdoubleJ/ApJ/854/L14/ph17dioPhotometry in ugriz + JHKse_zmag? Error in SDSS z-band magnitudemagstat.error;phot.mag;em.opt.IfloatnullableTelTelescope used for observationinstr.setupcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of observationtime.epochnullableMJDMJD of observationdtime.epoch;obsdoubleumag? SDSS u-band magnitudemagphot.mag;em.opt.Ufloatnullablee_umag? Error in SDSS u-band magnitudemagstat.error;phot.mag;em.opt.Ufloatnullablegmag? SDSS g-band magnitudemagphot.mag;em.opt.Bfloatnullablee_gmag? Error in SDSS g-band magnitudemagstat.error;phot.mag;em.opt.Bfloatnullablermag? SDSS r-band magnitudemagphot.mag;em.opt.Rfloatnullablee_rmag? Error in SDSS r-band magnitudemagstat.error;phot.mag;em.opt.Rfloatnullableimag? SDSS i-band magnitudemagphot.mag;em.opt.Ifloatnullablee_imag? Error in SDSS i-band magnitudemagstat.error;phot.mag;em.opt.Ifloatnullablezmag? SDSS z-band magnitudemagphot.mag;em.opt.IfloatnullableJmag? J-band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Error in J-band magnitudemagstat.error;phot.mag;em.IR.JfloatnullableHmag? H-band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Error in H-band magnitudemagstat.error;phot.mag;em.IR.HfloatnullableKmag? Ks-band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? Error in Ks-band magnitudemagstat.error;phot.mag;em.IR.KfloatnullableJ/ApJ/854/L14/s170430Spectrum on 2017-04-30recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaSpectrum wavelength0.1nmem.wldoubleFluxSpectrum flux (in erg/cm^2^/s/{AA})0.01W.m**-2.nm**-1phot.fluxdoubleJ/ApJ/854/L14/s170501Spectrum on 2017-05-01lambdaSpectrum wavelength0.1nmem.wldoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFluxSpectrum flux (in erg/cm^2^/s/{AA})0.01W.m**-2.nm**-1phot.fluxdoubleJ/ApJ/854/L14/s170502Spectrum on 2017-05-02lambdaSpectrum wavelength0.1nmem.wldoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFluxSpectrum flux (in erg/cm^2^/s/{AA})0.01W.m**-2.nm**-1phot.fluxdoubleJ/ApJ/854/L14/s170513Spectrum on 2017-05-13recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaSpectrum wavelength0.1nmem.wldoubleFluxSpectrum flux (in erg/cm^2^/s/{AA})0.01W.m**-2.nm**-1phot.fluxdoubleJ/ApJ/854/L14/s170514Spectrum on 2017-05-14recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaSpectrum wavelength0.1nmem.wldoubleFluxSpectrum flux (in erg/cm^2^/s/{AA})0.01W.m**-2.nm**-1phot.fluxdoubleJ/ApJ/854/L14/s170523Spectrum on 2017-05-23recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaSpectrum wavelength0.1nmem.wldoubleFluxSpectrum flux (in erg/cm^2^/s/{AA})0.01W.m**-2.nm**-1phot.fluxdoubleJ/ApJ/854/L14/s170718Spectrum on 2017-07-18recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaSpectrum wavelength0.1nmem.wldoubleFluxSpectrum flux (in erg/cm^2^/s/{AA})0.01W.m**-2.nm**-1phot.fluxdoubleJ/ApJ/854/L14/s170601Spectrum on 2017-06-01recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaSpectrum wavelength0.1nmem.wldoubleFluxSpectrum flux (in erg/cm^2^/s/{AA})0.01W.m**-2.nm**-1phot.fluxdouble