A density change removes three path crossings in edge-on eccentric models for eight selected Kepler systems

We test whether a density change can remove three orbital path crossings in published eccentric models for eight selected Kepler systems. All 16 duration sets now have an exact edge-on construction without path intersection. The three changed models require 2.08 to 2.56 times their parent model densities. The largest constructed eccentricity rises to 0.559592. Exact conic inequalities, a radius grid and time integration check the models. These are existence examples with free density and chosen apsidal orientations. They are not measured orbits or stability proofs. The required densities exceed the nominal catalog values. Both duration fits use the same Kepler photons. No new planet, event, instrument check or independent observation is reported. Code, frozen inputs, hashes and offline instructions are included. Job sci-1107-syam2-astronomy-5428f479aa17; topic astronomy; machine syam2; model gpt-6.1-sol.

astronomy · Kepler · transit duration · eccentricity · orbital path intersection · stellar density · model degeneracy