Dust accretion in binary systems: implications for planets and transition discs
Chachan, Yayaati and Booth, Richard A. and Triaud, Amaury H. M. J. and Clarke, Cathie (2019) Dust accretion in binary systems: implications for planets and transition discs. Monthly Notices of the Royal Astronomical Society, 489 (3). pp. 3896-3904. ISSN 0035-8711. doi:10.1093/mnras/stz2404. https://resolver.caltech.edu/CaltechAUTHORS:20191024-131519094
The presence of planets in binary systems poses interesting problems for planet formation theories, both in cases where planets must have formed in very compact discs around the individual stars and where they are located near the edge of the stable circumbinary region, where in situ formation is challenging. Dust dynamics is expected to play an important role in such systems, since dust trapping at the inner edge of circumbinary discs could aid in situ formation, but would simultaneously starve the circumstellar discs of the solid material needed to form planets. Here we investigate the dynamics of dust in binary systems using smoothed particle hydrodynamics. We find that all our simulations tend towards dust trapping in the circumbinary disc, but the time-scale on which trapping begins depends on binary mass ratio (q) and eccentricity as well as the angular momentum of the infalling material. For q ≳ 0.1, we find that dust can initially accrete on to the circumstellar discs, but as the circumbinary cavity grows in radius, dust eventually becomes trapped in the circumbinary disc. For q = 0.01, we find that increasing the binary eccentricity increases the time required for dust trapping to begin. However, even this longer time-scale is likely to be shorter than the planet formation time-scale in the inner disc and is insufficient to explain the observed pre-transitional discs. This indicates that increase in companion eccentricity alone is not enough to allow significant transfer of solids from the outer to the inner disc.
https://doi.org/10.1093/mnras/stz2404 DOI Article
Chachan, Yayaati 0000-0003-1728-8269
Booth, Richard A. 0000-0002-0364-937X
Triaud, Amaury H. M. J. 0000-0002-5510-8751
Clarke, Cathie 0000-0003-4288-0248
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Accepted 2019 August 28. Received 2019 August 27; in original form 2018 July 31. Published: 02 September 2019. We are grateful to the referee for thoughtful comments and suggestions that substantially improved this manuscript. Y. C. is grateful to St John's College, Cambridge and the Cambridge Commonwealth Trust for their generous support during the course of his education. Y. C. also thanks Eve J. Lee for helpful discussions. This work has been supported by the DISCSIM project, grant agreement 341137 funded by the European Research Council under ERC-2013-ADG. 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). Part of this work was undertaken on the COSMOS Shared Memory system at DAMTP, University of Cambridge operated on behalf of the Science and Technology Facilities Council (STFC) DiRAC HPC Facility. This equipment is funded by BIS National E-infrastructure capital grant ST/J005673/1 and STFC grants ST/H008586/1, ST/K00333X/1. Additionally, this work also benefited from 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.
Cambridge University UNSPECIFIED
Cambridge Commonwealth Trust UNSPECIFIED
European Research Council (ERC) 341137
European Research Council (ERC) ERC-2013-ADG
Marie Curie Fellowship 823823
Science and Technology Facilities Council (STFC) ST/J005673/1
Science and Technology Facilities Council (STFC) ST/H008586/1
Science and Technology Facilities Council (STFC) ST/K00333X/1
Science and Technology Facilities Council (STFC) ST/K000373/1
Science and Technology Facilities Council (STFC) ST/R002363/1
accretion, accretion discs – hydrodynamics – planets and satellites: formation – protoplanetary discs – binaries: general
10.1093/mnras/stz2404
Yayaati Chachan, Richard A Booth, Amaury H M J Triaud, Cathie Clarke, Dust accretion in binary systems: implications for planets and transition discs, Monthly Notices of the Royal Astronomical Society, Volume 489, Issue 3, November 2019, Pages 3896–3904, https://doi.org/10.1093/mnras/stz2404