Read, M. J., Wyatt, M. C., Marino, S. and Kennedy, Grant M. (2018) Shaping HR8799’s outer dust belt with an unseen planet. Monthly Notices of the Royal Astronomical Society, 475 (4). pp. 4953-4966. doi:10.1093/mnras/sty141

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Abstract

HR8799 is a benchmark system for direct imaging studies. It hosts two debris belts, which lie internally and externally to four giant planets. This paper considers how the four known planets and a possible fifth planet interact with the external population of debris through N-body simulations. We find that when only the known planets are included, the inner edge of the outer belt predicted by our simulations is much closer to the outermost planet than recent ALMA observations suggest. We subsequently include a fifth planet in our simulations with a range of masses and semimajor axes, which is external to the outermost known planet. We find that a fifth planet with a mass and semimajor axis of 0.1 MJ and 138 au predicts an outer belt that agrees well with ALMA observations, whilst remaining stable for the lifetime of HR8799 and lying below current direct imaging detection thresholds. We also consider whether inward scattering of material from the outer belt can input a significant amount of mass into the inner belt. We find that for the current age of HR8799, only ∼1 per cent of the mass-loss rate of the inner disc can be replenished by inward scattering. However, we find that the higher rate of inward scattering during the first ∼10 Myr of HR8799 would be expected to cause warm dust emission at a level similar to that currently observed, which may provide an explanation for such bright emission in other systems at ∼10 Myr ages.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Planets, Satellites
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Oxford University Press
ISSN:	1365-2966
Official Date:	18 January 2018
Dates:	Date Event 18 January 2018 Published 10 January 2018 Accepted
Volume:	475
Number:	4
Page Range:	pp. 4953-4966
DOI:	10.1093/mnras/sty141
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID Studentship [STFC] Science and Technology Facilities Council http://dx.doi.org/10.13039/501100000271 279973 European Union http://viaf.org/viaf/207634635 Research Fellowship Royal Society http://dx.doi.org/10.13039/501100000288
Open Access Version:	ArXiv

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