Kennedy, G. M. and Wyatt, M. C. and Bryden, G. and Wittenmyer, R. and Sibthorpe, B. (2013) Star-planet-debris disc alignment in the HD 82943 system: Is planetary system coplanarity actually the norm? Monthly Notices of the Royal Astronomical Society, 436 (1). pp. 898-903. ISSN 1365-2966
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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.
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| Item Type: | Article (Commonwealth Reporting Category C) |
|---|---|
| Refereed: | Yes |
| Item Status: | Live Archive |
| Additional Information: | Access to Published version allowed due to publisher copyright policy. |
| Faculty / Department / School: | No Faculty |
| Date Deposited: | 23 May 2017 05:57 |
| Last Modified: | 02 Nov 2017 04:40 |
| Uncontrolled Keywords: | circumstellar matter; planetary systems; formation; planets and satellites; individual stars; HD 82943; |
| Fields of Research : | 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems |
| Socio-Economic Objective: | E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences |
| Identification Number or DOI: | 10.1093/mnras/stt1657 |
| URI: | http://eprints.usq.edu.au/id/eprint/31770 |
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