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Table 1

Possible range and adopted values of the parameters.

Parameter Range Adopted

/M 10-4−10-2 10-2
td/yr 2.5 × 104−105 2.5 × 104
α 0.01−0.1 0.1
H/R 0.1−0.2 0.1
r in Eq. (10)
rout/AU 100−2000 500
μ/M 0.3

Notes. Md, td, α, H/R, rin and rout are the mass, the lifetime, the viscosity parameter, the thickness, the inner radius and the outer radius of the circumbinary disc, respectively (see also Fig. 2). μ is the reduced mass of the binary. See Sect. 4.1 for more details.

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