Oxygen and helium in stripped-envelope supernovae

Abstract

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 IIb), 45 Type Ib SNe (SNe Ib), 56 Type Ic SNe (SNe Ic), and 17 Type Ib/c SNe (SNe Ib/c). We compare 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 have identified 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 ($V_{\mathrm{m}}=\sqrt{2E_{\mathrm{k}}/M_{\mathrm{ej}}}\approx 15,000$ km s${}^{-1}$) and SNe Ib ($V_{\mathrm{m}}\approx 9000$ km s${}^{-1}$) would imply an average He mass difference of $\sim 1.4$ $M_{\odot }$, 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.

arXiv comment18 pages, 6 figures, accepted for publication in Astronomy and Astrophysics

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