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Table 5

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
0.83% 1.33% 1.85%
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% 0.440.67% 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 0.440.67%
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.


Assuming a binary fraction of fbin = 50%.


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.


This estimate does no longer depend on the assumed distribution of initial mass ratios.

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