  The hypothesis of an additional planet in the outer Solar System has gained
new support as a result of the confinement noted in the angular orbital
elements of distant trans-Neptunian objects. Orbital parameters proposed for
the external perturber suggest semimajor axes between 500 and 1000 au,
perihelion distances between 200 and 400 au for masses between 10 and 20
$M_{\oplus}$. In this paper we study the possibility that lower perihelion
distances for the additional planet can lead to angular confinements as
observed in the population of objects with semimajor axes greater than 250 au
and perihelion distances higher than 40 au. We performed numerical integrations
of a set of particles subjected to the influence of the known planets and the
putative perturber during the age of the Solar System and compared our outputs
with the observed population through a statistical analysis. Our investigations
showed that lower perihelion distances from the outer planet usually lead to
more substantial confinements than higher ones, while retaining the Classical
Kuiper Belt as well as the ratio of the number of detached with perihelion
distances higher than 42 au to scattering objects in the range of semimajor
axes from 100 au to 200 au.
