Abstract
A considerable fraction of multi-planet systems discovered by the
observational surveys of extrasolar planets reside in mild proximity to
first-order mean motion resonances. However, the relative remoteness of such
systems from nominal resonant period ratios (e.g. 2:1, 3:2, 4:3) has been
interpreted as evidence for lack of resonant interactions. Here we show that a
slow divergence away from exact commensurability is a natural outcome of
dissipative evolution and demonstrate that libration of critical angles can be
maintained tens of percent away from nominal resonance. We construct an
analytical theory for the long-term dynamical evolution of dissipated resonant
planetary pairs and confirm our calculations numerically. Collectively, our
results suggest that a significant fraction of the near-commensurate extrasolar
planets are in fact resonant and have undergone significant dissipative
evolution.
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