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Density waves in protoplanetary discs excited by eccentric planets: linear theory

Published version
Peer-reviewed

Type

Article

Change log

Authors

Rafikov, RR 

Abstract

jats:titleABSTRACT</jats:title> jats:pSpiral density waves observed in protoplanetary discs have often been used to infer the presence of embedded planets. This inference relies both on simulations as well as the linear theory of planet–disc interaction developed for planets on circular orbits to predict the morphology of the density wake. In this work, we develop and implement a linear framework for calculating the structure of the density wave in a gaseous disc driven by an eccentric planet. Our approach takes into account both the essential azimuthal and temporal periodicities of the problem, allowing us to treat any periodic perturbing potential (i.e. not only that of an eccentric planet). We test our framework by calculating the morphology of the density waves excited by an eccentric, low-mass planet embedded in a globally isothermal disc and compare our results to the recent direct numerical simulations (and heuristic wavelet analysis) of the same problem by Zhu and Zhang. We find excellent agreement with the numerical simulations, capturing all the complex eccentric features including spiral bifurcations, wave crossings, and planet-wave detachments, with improved accuracy and detail compared with the wavelet method. This illustrates the power of our linear framework in reproducing the morphology of complicated time-dependent density wakes, presenting it as a valuable tool for future studies of eccentric planet–disc interactions.</jats:p>

Description

Keywords

hydrodynamics, waves, planets and satellites: detection, planet-disc interactions, protoplanetary discs

Journal Title

Monthly Notices of the Royal Astronomical Society

Conference Name

Journal ISSN

0035-8711
1365-2966

Volume Title

517

Publisher

Oxford University Press (OUP)

Rights

Publisher's own licence
Sponsorship
STFC (ST/T00049X/1)
Science and Technology Facilities Council (ST/P000673/1)