Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 504, Issue 4, Pages 5444-5454Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab1145
Keywords
methods: analytical; planets and satellites: detection; planet-disc interactions; protoplanetary discs
Categories
Funding
- Australian Research Council [FT130100034, DP180104235, FT170100040]
- European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Actions [823823]
- Australian Research Council [FT170100040] Funding Source: Australian Research Council
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This paper presents a new technique for detecting protoplanets by observing the kinematics of surrounding gas. It shows that gravitational perturbations from a planet can produce unique 'kinks' in channel maps of different gas species, which can be reproduced using semi-analytic models. The study confirms the consistency of observed kinks with planet-induced wake and provides methods for quantifying planet mass from kink amplitude, as well as extending the theory to include damping effects for localized kinks.
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; and (iii) show how to extend the theory to include the effect of damping, which may be needed in order to have localized kinks.
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