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.

The theory of kinks - I. A semi-analytic model of velocity perturbations due to planet-disc interaction / F. Bollati, G. Lodato, D.J. Price, C. Pinte. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 504:4(2021 Jul), pp. 5444-5454. [10.1093/mnras/stab1145]

The theory of kinks - I. A semi-analytic model of velocity perturbations due to planet-disc interaction

Lodato G.;
2021-07

Abstract

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.
Methods: analytical; Planet-disc interactions; Planets and satellites: detection; Protoplanetary discs
Settore FIS/05 - Astronomia e Astrofisica
Dust and gas in planet forming discs (DUSTBUSTER)
27-apr-2021
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/858411
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