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Mutual inclinations between giant planets and their debris discs in HD 113337 and HD 38529
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Xuan, Jerry W., Kennedy, Grant M., Wyatt, Mark C. and Yelverton, Ben (2020) Mutual inclinations between giant planets and their debris discs in HD 113337 and HD 38529. Monthly Notices of the Royal Astronomical Society, 499 (4). pp. 5059-5074. doi:10.1093/mnras/staa3155 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/staa3155
Abstract
HD 113337 and HD 38529 host pairs of giant planets, a debris disc, and wide M-type stellar companions. We measure the disc orientation with resolved images from Herschel and constrain the three-dimensional orbits of the outer planets with Gaia DR2 and Hipparcos astrometry. Resolved disc modelling leaves degeneracy in the disc orientation, so we derive four separate planet-disc mutual inclination (∆I) solutions. The most aligned solutions give ∆I = 17°-32° for HD 113337 and ∆I = 21°-45○ for HD 38529 (both 1σ). In both systems, there is a small probability (<0.3 per cent) that the planet and disc are nearly aligned (∆I < 3○). The stellar and planetary companions cause the orbits of disc material to precess about a plane defined by the forced inclination. We determine this as well as the precession time-scale to interpret the mutual inclination results. We find that the debris discs in both systems could be warped via joint influences of the outer planet and stellar companion, potentially explaining the observed misalignments. However, this requires HD 113337 to be old (0.8-1.7 Gyr), whereas if young (14-21 Myr), the observed misalignment in HD 113337 could be inherited from the protoplanetary disc phase. For both systems, the inclination of the stellar spin axis is consistent with the disc and outer planet inclinations, which instead supports system-wide alignment or near alignment. High-resolution observations of the discs and improved constraints on the planetary orbits would provide firmer conclusions about the (mis)alignment status.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Space debris , Interstellar matter, Astrometry | |||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||
| Publisher: | Oxford University Press | |||||||||
| ISSN: | 0035-8711 | |||||||||
| Official Date: | December 2020 | |||||||||
| Dates: |
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| Volume: | 499 | |||||||||
| Number: | 4 | |||||||||
| Page Range: | pp. 5059-5074 | |||||||||
| DOI: | 10.1093/mnras/staa3155 | |||||||||
| 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 Jerry W Xuan, Grant M Kennedy, Mark C Wyatt, Ben Yelverton, Mutual inclinations between giant planets and their debris discs in HD 113337 and HD 38529, Monthly Notices of the Royal Astronomical Society, Volume 499, Issue 4, December 2020, Pages 5059–5074 is available online at: http://dx.doi.org/10.1093/mnras/staa3155 | |||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||
| Date of first compliant deposit: | 1 December 2020 | |||||||||
| Date of first compliant Open Access: | 1 December 2020 | |||||||||
| RIOXX Funder/Project Grant: |
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