J/MNRAS/389/955ivo://CDS.VizieR/J/MNRAS/389/955doi:10.26093/cds/vizier.73890955CDSPastorello A.Kasliwal M.M.Crockett R.M.Valenti S.Arbour R.,Itagaki K.Kaspi S.Gal-Yam A.Smartt S.J.Griffith R.Maguire K.,Ofek E.O.Seymour N.Stern D.Wiethoff W.2024-07-07T20:16:58Z2010-03-26T13:33:59ZCDS support team

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

cds-question@unistra.frsupernovaevisible-astronomybroad-band-photometrysloan-photometryWe present spectroscopy and photometry of the He-rich supernova (SN) 2008ax. The early-time spectra show prominent P-Cygni H lines, which decrease with time and disappear completely about 2 months after the explosion. In the same period HeI lines become the most prominent spectral features. SN 2008ax displays the ordinary spectral evolution of a Type IIb supernova. A stringent pre-discovery limit constrains the time of the shock breakout of SN 2008ax to within only a few hours. Its light curve, which peaks in the B band about 20d after the explosion, strongly resembles that of other He-rich core-collapse supernovae. The observed evolution of SN 2008ax is consistent with the explosion of a young Wolf-Rayet (of WNL type) star, which had retained a thin, low-mass shell of its original H envelope. The overall characteristics of SN 2008ax are reminiscent of those of SN 1993J, except for a likely smaller H mass. This may account for the findings that the progenitor of SN 2008ax was a WNL star and not a K supergiant as in the case of SN 1993J, that a prominent early-time peak is missing in the light curve of SN 2008ax, and that H{alpha} is observed at higher velocities in SN 2008ax than in SN 1993J.2008MNRAS.389..955Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/389/955CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/389/955https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/389/955http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/389/955https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/389/955https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/389/955http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/389/955GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.040811542443644e-19 6.090060298487514e-19OpticaldefaultJ/MNRAS/389/955/table1Optical photometry of SN 2008axrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation datetime.epoch;obsnullableJDJulian datedtime.epochdoubleu'mag? SDSS u' magnitudemagphot.mag;em.opt.Ufloatnullablee_u'mag? rms uncertainty on u'magmagstat.error;phot.magfloatnullableBmag? Johnson B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? rms uncertainty on Bmagmagstat.error;phot.mag;em.opt.BfloatnullableVmag? Johnson V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatnullableg'mag? SDSS g' magnitudemagphot.mag;em.opt.Bfloatnullablee_g'mag? rms uncertainty on g'magmagstat.error;phot.mag;em.opt.Bfloatnullabler'mag? SDSS r' magnitudemagphot.mag;em.opt.Rfloatnullablee_r'mag? rms uncertainty on r'magmagstat.error;phot.mag;em.opt.Rfloatnullablei'mag? SDSS i' magnitudemagphot.mag;em.opt.Ifloatnullablee_i'mag? rms uncertainty on i'magmagstat.error;phot.mag;em.opt.Ifloatnullablez'mag? SDSS z' magnitudemagphot.mag;em.opt.Ifloatnullablee_z'mag? rms uncertainty on z'magmagstat.error;phot.mag;em.opt.IfloatnullableInstInstrument (1)meta.id;instrcharJ/MNRAS/389/955/table2Unfiltered photometry of SN 2008ax from amateur astronomers, rescaled to the Johnson-Bessell V and/or Sloan r' bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation datetime.epoch;obsnullableJDJulian datedtime.epochdoublel_CVmaglimit flag on CVmagmeta.code.errorcharCVmag? Rescaled Johnson V magnitudemagphot.mag;em.opt.Vfloatnullablee_CVmag? rms uncertainty on CVmagmagstat.error;phot.magfloatnullablel_Cr'maglimit flag on Cr'magmeta.code.errorcharCr'mag? Rescaled SDSS r' magnitudemagphot.mag;em.opt.Rfloatnullablee_Cr'mag? rms uncertainty on Cr'magmagstat.error;phot.magfloatnullableInstInstrument and observer (1)obs.observerchar