Predicted rates for type IIb supernovae from stable mass transfer in binaries and its dependence on different input assumptions.
|Mass ratio distr.||Fav. extreme ratios||Flat||Fav. equal masses|
|(x = −1)||(x = 0)||(x = 1)|
|Fraction of binaries producing type IIb SNe via stable mass transfer|
|Number of type IIb relative to the number of all core collapse SNe|
|(assuming that the companion does – does not produce a core collapse SNe)|
|fbin = 25%||0.17–0.21%||0.27–0.33%||0.37–0.46%|
|fbin = 50%||0.28–0.42%||0.44–0.67%||0.62–0.93%|
|fbin = 100%||0.42–0.83%||0.67–1.33%||0.93–1.85%|
|Estimates of the rates assuming lower accretion efficiencies β1|
|β = 1.0||0.44–0.67%|
|β = 0.75||0.60–0.92 %2|
|β = 0.5||0.69–1.06%2|
|β = 0.25||0.71–1.09%2|
|Assuming that all systems with orbital periods between 1000 and 2000 days produce IIb’s13|
Notes. See Sect. 6 for details. The rate predicted based on our standard assumptions is marked in boldface.
The estimates for lower accretion efficiencies are based on just a few test models and should only be taken as indicative. A more extended grid of non-conservative models is required for a proper evaluation of these rates.
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