Fig. 2
Evolution (past and future) of the eccentricity (top) and semi-major axis (bottom) of a planet undergoing tidal dissipation with a power law ė ∝−ea−13∕2 (i.e. α = 13∕2). The timescale τ0 is the currently observed instantaneous damping timescale (in this example at a = a0, e = e0 =0.1). However,the shape of the curve is always the same and does not depend on e0.
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