2021/03/31 by Francesco Bollati, Giuseppe Lodato, Daniel J. Price +1 · 1 citation
Physics and Astronomy · #astro-ph.EP
paper · pdf · doi:10.1093/mnras/stab1145
Submission to MNRAS Accepted
arxiv created 2021/04/19 · arxiv updated 2021/05/12
A new technique to detect protoplanets is by observing the kinematics of the surrounding gas. Gravitational perturbations from a planet produce peculiar `kinks' in channel maps of different gas species. In this paper, we show that such kinks can be reproduced using semi-analytic models for the velocity perturbation induced by a planet. In doing so we i) confirm that the observed kinks are consistent with the planet-induced wake; ii) show how to quantify the planet mass from the kink amplitude; in particular, we show that the kink amplitude scales with the square root of the planet mass for channels far from the planet velocity, steepening to linear as the channels approach the planet; iii) show how to extend the theory to include the effect of damping, which may be needed in order to have localized kinks.