Investigating the properties of stripped-envelope supernovae; what are the implications for their progenitors?

C. Ashall, P. A. James, L. Short, P. A. Mazzali, D. Bersier, P. A. Crowther, C. Barbarino, T. W. Chen, C. M. Copperwheat, M. J. Darnley, L. Denneau, N. Elias-Rosa, M. Fraser, L. Galbany, A. Gal-Yam, J. Harmanen, D. A. Howell, G. Hosseinzadeh, C. Inserra, E. KankareE. Karamehmetoglu, G. P. Lamb, M. Limongi, C. McCully, F. Olivares, A. S. Piascik, G. Pignata, D. E. Reichart, A. Rest, T. Reynolds, Rodríguez, J. L.O. Saario, S. Schulze, S. J. Smartt, J. Sollerman, B. Stalder, M. Sullivan, F. Taddia, S. Valenti, S. D. Vergani, D. R. Young

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Abstract

We present observations and analysis of 18 stripped-envelope supernovae observed during 2013–2018. This sample consists of five H/He-rich SNe, six H-poor/He-rich SNe, three narrow lined SNe Ic, and four broad lined SNe Ic. The peak luminosity and characteristic time-scales of the bolometric light curves are calculated, and the light curves modelled to derive 56 Ni and ejecta masses (M Ni and M ej ). Additionally, the temperature evolution and spectral line velocity curves of each SN are examined. Analysis of the [O I] line in the nebular phase of eight SNe suggests their progenitors had initial masses <20 M. The bolometric light curve properties are examined in combination with those of other SE events from the literature. The resulting data set gives the M ej distribution for 80 SE–SNe, the largest such sample in the literature to date, and shows that SNe Ib have the lowest median M ej , followed by narrow-lined SNe Ic, H/He-rich SNe, broad-lined SNe Ic, and finally gamma-ray burst SNe. SNe Ic-6/7 show the largest spread of M ej ranging from ∼1.2–11 M, considerably greater than any other subtype. For all SE–SNe <M ej > = 2.8 ± 1.5 M which further strengthens the evidence that SE–SNe arise from low-mass progenitors which are typically <5 M at the time of explosion, again suggesting M ZAMS <25 M. The low <M ej > and lack of clear bimodality in the distribution implies <30 M progenitors and that envelope stripping via binary interaction is the dominant evolutionary pathway of these SNe.

Original languageEnglish
Pages (from-to)1559-1578
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Volume485
Issue number2
DOIs
Publication statusPublished - May 2019

Keywords

  • Supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Ashall, C., James, P. A., Short, L., Mazzali, P. A., Bersier, D., Crowther, P. A., Barbarino, C., Chen, T. W., Copperwheat, C. M., Darnley, M. J., Denneau, L., Elias-Rosa, N., Fraser, M., Galbany, L., Gal-Yam, A., Harmanen, J., Howell, D. A., Hosseinzadeh, G., Inserra, C., ... Young, D. R. (2019). Investigating the properties of stripped-envelope supernovae; what are the implications for their progenitors? Monthly Notices of the Royal Astronomical Society, 485(2), 1559-1578. https://doi.org/10.1093/mnras/sty3399