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Flyby-induced misalignments in planet-hosting discs

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journal contribution
posted on 02.04.2020, 08:59 by Rebecca Nealon, Nicolas Cuello, Richard Alexander
We now have several observational examples of misaligned broken protoplanetary discs, where the disc inner regions are strongly misaligned with respect to the outer disc. Current models suggest that this disc structure can be generated with an internal misaligned companion (stellar or planetary), but the occurrence rate of these currently unobserved companions remains unknown. Here we explore whether a strong misalignment between the inner and outer disc can be formed without such a companion. We consider a disc that has an existing gap – essentially separating the disc into two regions – and use a flyby to disturb the discs, leading to a misalignment. Despite considering the most optimistic parameters for this scenario, we find maximum misalignments between the inner and outer disc of ∼45◦ and that these misalignments are short-lived. We thus conclude that the currently observed misaligned discs must harbour internal, misaligned companions.

Funding

NC acknowledges financial support provided by FONDECYT grant 3170680 and from CONICYT project Basal AFB-170002. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 823823 (DUSTBUSTERS). This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 681601). This work was performed using the DiRAC Data Intensive service at Leicester, operated by the University of Leicester IT Services, which forms part of the STFC DiRAC HPC Facility (www.dirac.ac.uk). The equipment was funded by BEIS capital funding via STFC capital grants ST/K000373/1 and ST/R002363/1 and STFC DiRAC Operations grant ST/R001014/1. DiRAC is part of the National e-Infrastructure.

History

Citation

Monthly Notices of the Royal Astronomical Society, Volume 491, Issue 3, January 2020, Pages 4108–4115, https://doi.org/10.1093/mnras/stz3186

Version

VoR (Version of Record)

Published in

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

Volume

491

Issue

3

Pagination

4108 - 4115 (8)

Publisher

OXFORD UNIV PRESS

issn

0035-8711

eissn

1365-2966

Acceptance date

01/11/2019

Copyright date

2019

Available date

15/11/2019

Publisher version

http://dx.doi.org/10.1093/mnras/stz3186

Notes

Accepted for publication in MNRAS. 9 pages with 6 figures

Language

English