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Drastic changes in protoplanets' orbits could occur in the early stages ofplanetary systems through interactions with other planets and their surroundingprotoplanetary or debris discs. The resulting planetary system could exhibitorbits with moderate to high eccentricities and/or inclinations, causingplanets to perturb one another as well as the disc significantly. The presentwork studies the evolution of systems composed of an initially inclined planetand a debris disc. We perform N-body simulations of a narrow, self-gravitatingdebris disc and a single interior Neptune-like planet. We simulate systems withvarious initial planetary inclinations, from coplanar to polar configurationsconsidering different separations between the planet and the disc. We find thatexcept when the planet is initially on a polar orbit, the planet-disc systemtends to reach a quasi-coplanar configuration with low vertical dispersion inthe disc. When present, the Zeipel--Kozai--Lidov oscillations induced by thedisc pump the planet's eccentricity and, in turn, affect the disc structure. Wealso find that the resulting disc morphology in most of the simulations looksvery similar in both radial and vertical directions once the simulations areconverged. This contrasts strongly with massless disc simulations, wherevertical disc dispersion is set by the initial disc-planet inclination and canbe high for initially highly inclined planets. The results suggest caution ininterpreting an unseen planet's dynamical history based only on the disc'sappearance.

Self-gravity of debris discs can strongly change the outcomes of interactions with inclined planets