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The Equilibrium Tide: an updated prescription for population synthesis codes

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Preece,  Holly P.
MPI for Astrophysics, Max Planck Society;

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Hamers,  Adrian S.
High Energy Astrophysics, MPI for Astrophysics, Max Planck Society;

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Neunteufel,  Patrick G.
High Energy Astrophysics, MPI for Astrophysics, Max Planck Society;

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Schaefer,  Adam L.
Galaxy Formation, Cosmology, MPI for Astrophysics, Max Planck Society;

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Citation

Preece, H. P., Hamers, A. S., Neunteufel, P. G., Schaefer, A. L., & Tout, C. A. (2022). The Equilibrium Tide: an updated prescription for population synthesis codes. The Astrophysical Journal, 933(1): 25. doi:10.3847/1538-4357/ac6fe3.


Cite as: https://hdl.handle.net/21.11116/0000-000B-58AD-0
Abstract
We present an updated prescription for the equilibrium tides suitable for population synthesis codes. A grid of 1D evolutionary models was created and the viscous timescale was calculated for each detailed model. A metallicity-dependent power-law relation was fitted to both the convective cores and convective envelopes of the models. The prescription was implemented into the population synthesis code Binary Star Evolution and predicts a 16.5% reduction in the overall number of merges, with those involving main-sequence stars most affected. The new prescription also reduces the overall supernova rate by 3.6% with individual channels being differently affected. The single degenerate Ia supernova occurrence is reduced by 12.8%. The merging of two carbon oxygen white dwarfs to cause a Ia supernova occurs 16% less frequently. The number of subsynchronously rotating stars in close binaries is substantially increased with our prescription, as is the number of noncircularized systems at the start of common-envelope evolution.