We present five morphological and kinematic criteria to aid in asserting the binary nature of a protoplanetary disc, based on 3D hydrodynamical simulations of circumbinary discs post-processed with Monte Carlo radiative transfer. We find that circumbinary discs may be identified by i) a central cavity, ii) spiral arms both in and outside of their central cavities, iii) non-localised perturbations in their iso-velocity curves, iv) asymmetry between the lines of maximum speed of the blue and red-shifted wings and v) asymmetry between the area of the blue and red-shifted wings. We provide quantitative metrics for the last two criteria that can be used, in conjunction with the morphological criteria, to signal whether a protoplanetary disc is likely to be a circumbinary disc.
@article{arxiv.2306.07909,
title = {Observational Signatures of Circumbinary Discs I: Kinematics},
author = {Josh Calcino and Daniel J. Price and Christophe Pinte and Himanshi Garg and Brodie J. Norfolk and Valentin Christiaens and Hui Li and Richard Teague},
journal= {arXiv preprint arXiv:2306.07909},
year = {2023}
}