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We study how close-in systems such as those detected by Kepler are affectedby the dynamics of bodies in the outer system. We consider two scenarios: outersystems of giant planets potentially unstable to planet--planet scattering, andwide binaries that may be capable of driving Kozai or other secular variationsof outer planets' eccentricities. Dynamical excitation of planets in the outersystem reduces the multiplicity of Kepler-detectable planets in the innersystem in $\sim20-25\%$ of our systems. Accounting for the occurrence rates ofwide-orbit planets and binary stars, $\approx18\%$ of close-in systems could bedestabilised by their outer companions in this way. This provides somecontribution to the apparent excess of systems with a single transiting planetcompared to multiple, however, it only contributes at most $25\%$ of theexcess. The effects of the outer dynamics can generate systems similar toKepler-56 (two coplanar planets significantly misaligned with the host star)and Kepler-108 (two significantly non-coplanar planets in a binary). We alsoidentify three pathways to the formation of eccentric warm Jupiters resultingfrom the interaction between outer and inner systems: direct inelasticcollision between an eccentric outer and an inner planet, secular eccentricityoscillations that may "freeze out" when scattering resolves in the outersystem; and scattering in the inner system followed by "uplift", where innerplanets are removed by interaction with the outer planets. In these scenarios,the formation of eccentric warm Jupiters is a signature of a past history ofviolent dynamics among massive planets beyond $\sim1$ au.

The effects of external planets on inner systems: multiplicities, inclinations, and pathways to eccentric warm Jupiters