Fig. 7
Timescales for tidal orbital circularisation τe, semi-major axis decay τa, and stellar spin evolution, τΩ,⋆. The contributions from the star and the brown dwarf as given by Eqs. (1)–(4) are shown, as well as the net effect, taking quality factors 
and 
. The diagonal line marks where the timescale at a given age is equal to the system’s age.
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