Wright, CM, Maddison, ST, Wilner, DJ et al. (7 more authors) (2015) Resolving structure of the disc around HD100546 at 7 mm with ATCA. Monthly Notices of the Royal Astronomical Society, 453 (1). pp. 414-438. ISSN 0035-8711
Abstract
There is much evidence that planet formation is occurring in the disc around the Herbig Be star HD100546. To learn more about the processes occurring in this disc, we conducted high-resolution imaging at 43/45 GHz with the Australia Telescope Compact Array. Multiple array configurations were used, providing a best spatial resolution of ∼0.15 arcsec, or 15 au at HD100546's distance of ∼100 pc. Significant structure is revealed, but its precise form is dependent on the u − v plane sampling used for the image reconstruction. At a resolution of ≤30 au, we detected an inner gap in the disc with a radius of ∼25 au and a position angle approximately along the known disc major axis. With different weighting, and an achieved resolution of ∼15 au, emission appears at the centre and the disc takes on the shape of an incomplete ring, much like a horseshoe, again with a gap radius of ∼25 au. The position angle of the disc major axis and its inclination from face-on are determined to be 140° ± 5° and 40° ± 5°, respectively. The ∼25 au gap radius is confirmed by a null in the real part of the binned visibilities at 320 ± 10 kλ, whilst the non-axisymmetric nature is also confirmed through significant structure in the imaginary component. The emission mechanism at the central peak is most likely to be free–free emission from a stellar or disc wind. Overall our data support the picture of at least one, but probably several, giant planets orbiting HD100546 within 25 au.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | protoplanetary discs; circumstellar matter; planetary systems; stars: pre-main-sequence; radio continuum: stars |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Astrophysics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 16 Nov 2016 11:10 |
Last Modified: | 16 Nov 2016 11:10 |
Published Version: | https://doi.org/10.1093/mnras/stv1619 |
Status: | Published |
Publisher: | Oxford University Press |
Identification Number: | 10.1093/mnras/stv1619 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:107113 |