Star-planet-debris disc alignment in the HD 82943 system: Is planetary system coplanarity actually the norm?
Article
Article Title | Star-planet-debris disc alignment in the HD 82943 system: Is planetary system coplanarity actually the norm? |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Kennedy, G. M. (Author), Wyatt, M. C. (Author), Bryden, G. (Author), Wittenmyer, R. (Author) and Sibthorpe, B. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 436 (1), pp. 898-903 |
Number of Pages | 6 |
Year | 2013 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stt1657 |
Web Address (URL) | https://academic.oup.com/mnras/article/436/1/898/977935 |
Abstract | Recent results suggest that the two planets in the HD 82943 system are inclined to the sky plane by 20 ± 4°. Here, we show that the debris disc in this system is inclined by 27 ± 4°, thus adding strength to the derived planet inclinations and suggesting that the planets and debris disc are consistent with being aligned at a level similar to the Solar system. Further, the stellar equator is inferred to be inclined by 28 ± 4°, suggesting that the entire star-planet-disc system is aligned, the first time such alignment has been tested for radial velocity discovered planets on ~au wide orbits. We show that the planet-disc alignment is primordial, and not the result of planetary secular perturbations to the disc inclination. In addition, we note three other systems with planets at ≳10 au discovered by direct imaging that already have good evidence of alignment, and suggest that empirical evidence of system-wide star-planet-disc alignment is therefore emerging, with the exception of systems that host hot Jupiters. While this alignment needs to be tested in a larger number of systems, and is perhaps unsurprising, it is a reminder that the system should be considered as a whole when considering the orientation of planetary orbits. |
Keywords | circumstellar matter; planetary systems; formation; planets and satellites; individual stars; HD 82943; |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Cambridge, United Kingdom |
California Institute of Technology (Caltech), United States | |
University of New South Wales | |
Netherlands Institute for Space Research, Netherlands | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q41v2/star-planet-debris-disc-alignment-in-the-hd-82943-system-is-planetary-system-coplanarity-actually-the-norm
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