  The orbital distribution of transneptunian objects (TNOs) in the distant
Kuiper Belt (with semimajor axes beyond the 2:1 resonance, roughly $a$=50-100
au) provides constraints on the dynamical history of the outer solar system.
Recent studies show two striking features of this region: 1) a very large
population of objects in distant mean-motion resonances with Neptune, and 2)
the existence of a substantial detached population (non-resonant objects
largely decoupled from Neptune). Neptune migration models are able to implant
some resonant and detached objects during the planet migration era, but many
fail to match a variety of aspects of the orbital distribution. In this work,
we report simulations carried out using an improved version of the GPU-based
code GLISSE, following 100,000 test particles per simulation in parallel while
handling their planetary close encounters. We demonstrate for the first time
that a 2 Earth-mass rogue planet temporarily present during planet formation
can abundantly populate both the distant resonances and the detached
populations, surprisingly even without planetary migration. We show how weak
encounters with the rogue greatly increase the efficiency of filling the
resonances, while also dislodging TNOs out of resonance once they reach high
perihelia. The rogue's secular gravitational influence simultaneously generates
numerous detached objects observed at all semimajor axes. These results suggest
that the early presence of additional planet(s) reproduces the observed TNO
orbital structure in the distant Kuiper Belt.
