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  • Fremling, ChristofferStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),California Institute of Technology, USA (author)

Oxygen and helium in stripped-envelope supernovae

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • 2018-10-11
  • EDP Sciences,2018
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-161966
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-161966URI
  • https://doi.org/10.1051/0004-6361/201731701DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • We 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 Type IIb SNe (SNe 45 Type Ib SNe (SNe IIb), 56 Type Ic SNe (SNe Ic), and 17 Type Ib/c SNe (SNe Ib/c). We have compared the SE SN subtypes via measurements of the pseudo-equivalent widths (pEWs) and velocities of the He I lambda lambda 5876, 7065 and O I lambda 7774 absorption lines. Consistent with previous work, we find that SNe Ic show higher pEWs and velocities in O I lambda 7774 compared to SNe IIb and Ib. The pEWs of the He I lambda lambda 5876, 7065 lines are similar in SNe Ib and IIb after maximum light. The He I lambda lambda 5876, 7065 velocities at maximum light are higher in SNe Ib compared to SNe IIb. We identify an anticorrelation between the He I lambda 7065 pEW and O I lambda 7774 velocity among SNe IIb and Ib. This can be interpreted as a continuum in the amount of He present at the time of explosion. It has been suggested that SNe Ib and Ic have similar amounts of He, and that lower mixing could be responsible for hiding He in SNe Ic. However, our data contradict this mixing hypothesis. The observed difference in the expansion rate of the ejecta around maximum light of SNe Ic (V-m root 2E(k)/M-ej approximate to 15 000 km s(-1)) and SNe Ib (V-m approximate to 9000 km s(-1)) would imply an average He mass difference of similar to 1.4 M-circle dot, if the other explosion parameters are assumed to be unchanged between the SE SN subtypes. We conclude that SNe Ic do not hide He but lose He due to envelope stripping.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Sollerman, JesperStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)solle (author)
  • Kasliwal, M. M. (author)
  • Kulkarni, S. R. (author)
  • Barbarino, CristinaStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)cbarb (author)
  • Ergon, MattiasStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)maer0651 (author)
  • Karamehmetoglu, EmirStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)emka6994 (author)
  • Taddia, FrancescoStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)ftadd (author)
  • Arcavi, I (author)
  • Cenko, S. B. (author)
  • Clubb, K. (author)
  • De Cia, A. (author)
  • Duggan, G. (author)
  • Filippenko, A. (author)
  • Gal-Yam, A. (author)
  • Graham, M. L. (author)
  • Horesh, A. (author)
  • Hosseinzadeh, G. (author)
  • Howell, D. A. (author)
  • Kuesters, D. (author)
  • Lunnan, RagnhildStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),California Institute of Technology, USA(Swepub:su)rlunn (author)
  • Matheson, T. (author)
  • Nugent, P. E. (author)
  • Perley, D. A. (author)
  • Quimby, R. M. (author)
  • Saunders, C. (author)
  • Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics: EDP Sciences6180004-63611432-0746

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