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High resolution ALMA and HST imaging of κ CrB : a broad debris disc around a post-main sequence star with low-mass companions
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Lovell, J. B., Wyatt, M. C., Kalas, P., Kennedy, Grant M., Marino, S., Bonsor, A., Penoyre, Z., Fulton, B. J. and Pawellek, N. (2022) High resolution ALMA and HST imaging of κ CrB : a broad debris disc around a post-main sequence star with low-mass companions. Monthly Notices of the Royal Astronomical Society, 517 (2). pp. 2546-2566. doi:10.1093/mnras/stac2782 ISSN 0035-8711.
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WRAP-High-resolution-ALMA-and-HST-imaging-of-k-CrB-a-broad-debris-disc-around-a-post-main-sequence-star-with-low-mass-companions-Kennedy-2022.pdf - Accepted Version - Requires a PDF viewer. Download (2462Kb) | Preview |
Official URL: http://doi.org/10.1093/mnras/stac2782
Abstract
κ CrB is a ~2.5 Gyr old K1 sub-giant star, with an eccentric exo-Jupiter at ~2.8 au and a debris disc at tens of au. We present ALMA Band 6 (1.3 mm) and HST scattered light (0.6 μm) images, demonstrating κ CrB's broad debris disc, covering an extent 50 - 180 au in the millimetre (peaking at 110 au), and 51 - 280 au in scattered light (peaking at 73 au). By modelling the millimetre emission, we estimate the dust mass as ~0.016 M⊕, and constrain lower-limit planetesimal sizes as Dmax ≳ 1 km and the planetesimal belt mass as Mdisc ≳ 1 M⊕. We constrain the properties of an outer body causing a linear trend in 17 years of radial velocity data to have a semi-major axis 8 - 66 au and a mass 0.4 - 120 MJup. There is a large inner cavity seen in the millimetre emission, which we show is consistent with carving by such an outer massive companion with a string of lower mass planets. Our scattered light modelling shows that the dust must have a high anisotropic scattering factor (g ~ 0.8 - 0.9) but an inclination (i ~ 30 - 40○) that is inferred to be significantly lower than the i ~ 61○ millimetre inclination. The origin of such a discrepancy is unclear, but could be caused by a misalignment in the micron and millimetre sized dust. We place an upper limit on the CO gas mass of MCO < (4.2 - 13) × 10-7 M⊕, and show this to be consistent with levels expected from planetesimal collisions, or from CO-ice sublimation as κ CrB begins its giant branch ascent.
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): | Submillimeter astronomy , Submillimeter waves , Planetary systems , Low mass stars | ||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||
Publisher: | Oxford University Press | ||||||||||||||||||
ISSN: | 0035-8711 | ||||||||||||||||||
Official Date: | December 2022 | ||||||||||||||||||
Dates: |
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Volume: | 517 | ||||||||||||||||||
Number: | 2 | ||||||||||||||||||
Page Range: | pp. 2546-2566 | ||||||||||||||||||
DOI: | 10.1093/mnras/stac2782 | ||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||
Reuse Statement (publisher, data, author rights): | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | ||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||
Date of first compliant deposit: | 17 October 2022 | ||||||||||||||||||
Date of first compliant Open Access: | 17 October 2022 | ||||||||||||||||||
RIOXX Funder/Project Grant: |
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