Disentangle model and parameter-space origins of differing efficiency predictions

Determine whether the differences between the mass-transfer-efficiency distributions predicted by the present disc-mediated angular-momentum model and the disc model of Xing arise from differences in the underlying physical prescriptions or from differences in the sampled parameter spaces.

Background

The paper finds that its predicted mass-transfer-efficiency distribution differs from that obtained by Xing, despite both models incorporating disc-mediated angular-momentum transport and both broadly matching observed sdOB+Be systems. The present model produces an approximately flat distribution, whereas the comparison model favours efficiencies near 50 percent. The source of this discrepancy is not resolved.

References

However, it remains unclear whether such differences arise due to differing models or differences in sampled parameter space.

— Disc-mediated angular momentum transport resolves the mass-gain problem in rotating binaries  (2609.30230 - Ljung et al., 24 Sep 2026) in Section 4.1, Implications for mass-transfer efficiency models