The protoplanetary disc around HD 169142: circumstellar or circumbinary?

ABSTRACT Stellar binaries represent a substantial fraction of stellar systems, especially among young objects. Accordingly, play an important role in setting the architecture large number protoplanetary discs. Binaries coplanar and polar orientations with respect to circumbinary disc are stable configurations could induce non-axisymmetric structures dust gas distributions. In this work, we suggest that shown central region HD 169142 produced by presence inner binary (P-type) planet. We find companion mass ratio 0.1, semimajor axis 9.9 au, eccentricity 0.2, inclination 90°, together 2 MJ planet on circular orbit at 45 au reproduce innermost ring observed 1.3 mm shape spiral features scattered light observations. The model predicts changes disc’s structure, star’s astrometric parameters, which would allow testing its veracity monitoring system over next 20 yr.