J/A+A/618/A37ivo://CDS.VizieR/J/A+A/618/A37doi:10.26093/cds/vizier.36180037CDSFremling C.Sollerman J.Kasliwal M.M.Kulkarni S.R.Barbarino C.,Ergon M.Karamehmetoglu E.Taddia F.Arcavi I.Cenko S.B.Clubb K.,De Cia A.Duggan G.Filippenko A.V.Gal-Yam A.Graham M.L.Horesh A.,Hosseinzadeh G.Howell D.A.Kuesters D.Lunnan R.Matheson T.,Nugent P.E.Perley D.A.Quimby R.M.Saunders C.2019-03-25T13:40:00Z2019-03-14T09:31:18ZCDS support team

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

cds-question@unistra.frsupernovaeWe present an analysis of 507 spectra of 173 stripped-envelope (SE) supernovae (SNe) discovered by the untargeted Palomar Transient Factory (PTF) and intermediate PTF (iPTF) surveys. Our sample contains 55 TypeIIb SNe (SNeIIb), 45 TypeIb SNe (SNeIb), 56 TypeIc SNe (SNeIc), and 17 TypeIb/c SNe (SNeIb/c). We have compared the SE SN subtypes via measurements of the pseudo-equivalent widths (pEWs) and velocities of the HeI{lambda}{lambda}5876, 7065 and OI{lambda}7774 absorption lines. Consistent with previous work, we find that SNeIc show higher pEWs and velocities in OI{lambda}7774 compared to SNeIIb andIb. The pEWs of the HeI{lambda}{lambda}5876, 7065 lines are similar in SNeIb andIIb after maximum light. The HeI{lambda}{lambda}5876, 7065 velocities at maximum light are higher in SNeIb compared to SNeIIb. We identify an anticorrelation between the HeI{lambda}7065 pEW and OI{lambda}7774 velocity among SNeIIb andIb. This can be interpreted as a continuum in the amount of He present at the time of explosion.It has been suggested that SNeIb andIc have similar amounts of He, and that lower mixing could be responsible for hiding He in SNeIc. However, our data contradict this mixing hypothesis. The observed difference in the expansion rate of the ejecta around maximum light of SNeIc (V_m_=sqrt(2)E_k_/M_ej_~=15000km/s) and SNeIb (V_m_~=9000km/s) would imply an average He mass difference of ~1.4M_{sun}_, if the other explosion parameters are assumed to be unchanged between the SE SN subtypes. We conclude that SNeIc do not hide He but lose He due to envelope stripping.2018A&A...618A..37Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/618/A37CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/618/A37https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/618/A37http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/618/A37https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/618/A37https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/618/A37http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/618/A37GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/618/A37/tablea1 (Spectral log for the (i)PTF stripped-envelope SN sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/618/A37/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/618/A37/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/618/A37/tablea1?GETtext/xml+votable180.050000true204.484833322.9180.0055555555555555566/539 543 2261 2333 2346 2382 2649 5244 6265 6561 7234 7766 8195 8306 8477 8568 8754 9381 9620 9678 10158 10258 10263 10397 10437 10539 10544 10574 10638 11027 11044 11156 11310 11385 11737 13570 17351 17525 18144 18630 18939 19035 19201 19331 19432 19619 19979 20000 20005 20009 20013 20021 20116 20154 25951 26297 27729 27803 27913 28039 28538 36131 36298https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/618/A37?format=asciidefaultJ/A+A/618/A37/tablea1Spectral log for the (i)PTF stripped-envelope SN sampleSimbadNameSimbad column added by the CDSmeta.idcharzRedshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNSN name NNaaaameta.id;meta.maincharTypeSN typesrc.classcharNote[*] Note (1)meta.notecharPhasePhase (rest-frame days from peak) (2)time.phasecharE(B-V)Milky Way E(B-V) colour excessmagphot.color.excessfloat_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullable