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Insights into the planetary dynamics of HD 206893 with ALMA
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Marino, S., Zurlo, A., Faramaz, V., Milli, J., Henning, Th, Kennedy, Grant M., Matrà, L., Pérez, S., Delorme, P., Cieza, L. A. and Hughes, A. M. (2020) Insights into the planetary dynamics of HD 206893 with ALMA. Monthly Notices of the Royal Astronomical Society, 498 (1). pp. 1319-1334. doi:10.1093/mnras/staa2386 ISSN 0035-8711.
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Official URL: https://doi.org/10.1093/mnras/staa2386
Abstract
Radial substructure in the form of rings and gaps has been shown to be ubiquitous among protoplanetary discs. This could be the case in exo-Kuiper belts as well, and evidence for this is emerging. In this paper, we present ALMA observations of the debris/planetesimal disc surrounding HD 206893, a system that also hosts two massive companions at 2 and 11 au. Our observations reveal a disc extending from 30 to 180 au, split by a 27 au wide gap centred at 74 au, and no dust surrounding the reddened brown dwarf (BD) at 11 au. The gap width suggests the presence of a 0.9MJup planet at 74 au, which would be the third companion in this system. Using previous astrometry of the BD, combined with our derived disc orientation as a prior, we were able to better constrain its orbit finding it is likely eccentric ( 0.14+0.05−0.04 ). For the innermost companion, we used radial velocity, proper motion anomaly, and stability considerations to show its mass and semimajor axis are likely in the ranges 4-100MJup and 1.4-4.5 au. These three companions will interact on secular time-scales and perturb the orbits of planetesimals, stirring the disc and potentially truncating it to its current extent via secular resonances. Finally, the presence of a gap in this system adds to the growing evidence that gaps could be common in wide exo-Kuiper belts. Out of six wide debris discs observed with ALMA with enough resolution, four to five show radial substructure in the form of gaps.
Item Type: | Journal Article | ||||||||||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
Library of Congress Subject Headings (LCSH): | Circumstellar matter, Protoplanetary disks, Space debris, Planetary systems | ||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||
Publisher: | Wiley | ||||||||||||
ISSN: | 0035-8711 | ||||||||||||
Official Date: | 31 August 2020 | ||||||||||||
Dates: |
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Volume: | 498 | ||||||||||||
Number: | 1 | ||||||||||||
Page Range: | pp. 1319-1334 | ||||||||||||
DOI: | 10.1093/mnras/staa2386 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record [insert complete citation information here] is available online at: S Marino, A Zurlo, V Faramaz, J Milli, Th Henning, G M Kennedy, L Matrà, S Pérez, P Delorme, L A Cieza, A M Hughes, Insights into the planetary dynamics of HD 206893 with ALMA, Monthly Notices of the Royal Astronomical Society, Volume 498, Issue 1, October 2020, Pages 1319–1334,https://doi.org/10.1093/mnras/staa2386 | ||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
Date of first compliant deposit: | 30 November 2020 | ||||||||||||
Date of first compliant Open Access: | 30 November 2020 | ||||||||||||
RIOXX Funder/Project Grant: |
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Open Access Version: |
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