Insights into the planetary dynamics of HD 206893 with ALMA. Issue 1 (31st August 2020)
- Record Type:
- Journal Article
- Title:
- Insights into the planetary dynamics of HD 206893 with ALMA. Issue 1 (31st August 2020)
- Main Title:
- Insights into the planetary dynamics of HD 206893 with ALMA
- Authors:
- Marino, S
Zurlo, A
Faramaz, V
Milli, J
Henning, Th
Kennedy, G M
Matrà, L
Pérez, S
Delorme, P
Cieza, L A
Hughes, A M - Abstract:
- 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 0.9 M Jup 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 4–100 M Jup 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.
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 498:Issue 1(2020)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 498:Issue 1(2020)
- Issue Display:
- Volume 498, Issue 1 (2020)
- Year:
- 2020
- Volume:
- 498
- Issue:
- 1
- Issue Sort Value:
- 2020-0498-0001-0000
- Page Start:
- 1319
- Page End:
- 1334
- Publication Date:
- 2020-08-31
- Subjects:
- methods: numerical -- techniques: interferometric -- planets and satellites: dynamical evolution and stability -- circumstellar matter -- stars: individual: HD 206893 -- submillimetre: planetary systems
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/staa2386 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
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British Library HMNTS - ELD Digital store - Ingest File:
- 15083.xml