Recent ALMA observations of the protoplanetary disc around HD~169142 reveal a peculiar structure made of concentric dusty rings: a main ring at ∼20 au, a triple system of rings at ∼55−75 au in millimetric continuum emission and a perturbed gas surface density from the 12CO,13CO and C18O(J=2−1) surface brightness profile. In this Letter, we perform three-dimensional numerical simulations and radiative transfer modeling exploring the possibility that two giant planets interacting with the disc and orbiting in resonant locking can be responsible for the origin of the observed dust inner rings structure. We find that in this configuration the dust structure is actually long lived while the gas mass of the disc is accreted onto the star and the giant planets, emptying the inner region. In addition, we also find that the innermost planet is located at the inner edge of the dust ring, and can accrete mass from the disc, generating a signature in the dust ring shape that can be observed in mm ALMA observations.
@article{arxiv.1911.08580,
title = {Long lived dust rings around HD169142},
author = {Claudia Toci and Giuseppe Lodato and Davide Fedele and Leonardo Testi and Christophe Pinte},
journal= {arXiv preprint arXiv:1911.08580},
year = {2020}
}