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Fig. 7


[O I]λλ6300,6364/[Ca II]λλ7291,7324 line ratio of several core-collapse SNe of similar ages during the nebular phase. Red symbols indicate SN Type-II, orange Type-IIb, green Type-Ib, blue Type-Ic, and purple broad-lined Type-Ic. The SN phases with respect to the time of maximum light are shown next to the each data point and the dashed vertical line indicates iPTF13bvn. The light-grey shaded region indicates the single star progenitors and the dark-grey shaded region indicates the binary progenitors for Type-Ib/c SNe. The exact border between these two regions is unknown, thus arbitrarily taken at [O I]/[Ca II] = 1.5 in this plot for the purpose of indicating the two distinct populations. References for the spectra of individual SNe: 1987A (Pun et al. 1995); 1992H (Clocchiatti et al. 1996); 1997D (Benetti et al. 2001); 1998A (Pastorello et al. 2005); 1998bw (Patat et al. 2001); 1999em (Leonard et al. 2002); 2004et (Sahu et al. 2006); 2004gq (Maeda et al. 2008); 2005bf (Maeda et al. 2007b); 2006bp (Quimby et al. 2007); 1996cb, 2002ap, 2004fe, 2004gk, 2008ax, 2009jf (Modjaz et al. 2008, 2014).

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