Multi-planet systems reach local pairwise tidal equilibria with equal masses and regular spacing, matching observations but not a global energy minimum, and implying a steep surface density profile.
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Pairwise Tidal Equilibrium States and the Architecture of Extrasolar Planetary Systems
Multi-planet systems reach local pairwise tidal equilibria with equal masses and regular spacing, matching observations but not a global energy minimum, and implying a steep surface density profile.