Fig. 11.

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Radius (left) and effective temperature (right) of the primary stars at core collapse as a function of their envelope mass, for models that undergo stable mass transfer and that are not fully stripped (filled markers). Different colors are defined as in Fig. 2, and different symbols indicate their mass transfer history (crosses for models not undergoing mass transfer, diamonds for Case C models, squares for Case BC and circles for Case B). Grey arrows indicate models with values outside of the bounds of the plot. The total mass of hydrogen in the models is displayed as a secondary axis on top. Estimated progenitor properties of several observed Type IIb SNe are also shown (cf. Table 2) with error bars. Solid-line error bars refer to several references (see Table 2) while those in dotted lines are taken from Gilkis & Arcavi (2022). The progenitor radius estimates from light-curve fitting are shown as shaded boxes.
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