Binary progenitor models of type IIb supernovae | Astronomy & Astrophysics (A&A)

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Volume 528 (April 2011)

A&A, 528 (2011) A131

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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)
f_bin = 25%	0.17–0.21%	0.27–0.33%	0.37–0.46%
f_bin = 50%	0.28–0.42%	0.44–0.67%	0.62–0.93%
f_bin = 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
	–	2.3–3.5%	–

Notes. See Sect. 6 for details. The rate predicted based on our standard assumptions is marked in boldface.

⁽¹⁾

Assuming a binary fraction of f_bin = 50%.

⁽²⁾

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.

⁽³⁾

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

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