Ilee, JD orcid.org/0000-0003-1008-1142, Walsh, C orcid.org/0000-0001-6078-786X, Jennings, J et al. (5 more authors) (2022) Unveiling the outer dust disc of TW Hya with deep ALMA observations. Monthly Notices of the Royal Astronomical Society: Letters, 515 (1). L23-L28. ISSN 1745-3933
Abstract
The radial extent of millimetre dust in protoplanetary discs is often far smaller than that of their gas, mostly due to processes such as dust growth and radial drift. However, it has been suggested that current millimetre continuum observations of discs do not trace their full extent due to limited sensitivity. In this letter, we present deep (19 μJy beam−1) moderate resolution (0.37 arcsec) ALMA observations at 1 mm of the nearest protoplanetary disc, TW Hya. Using the visibility analysis tool frank, we reveal a structured millimetre intensity distribution out to 100 au, well beyond previous estimates of 60–70 au. Our analysis suggests the presence of a new millimetre continuum gap at 82 au, coincident with similar features seen in optical/near-infrared scattered light and millimetre molecular line observations. Examination of the fit residuals confirms the presence of the previously reported au-scale continuum excess at 52 au (P.A. = 242.5°). Our results demonstrate the utility of combining deep, moderate-resolution observations with super-resolution analysis techniques to probe the faintest regions of protoplanetary discs.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters © The Author(s) 2022. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Keywords: | techniques: interferometric, protoplanetary discs, stars: individual: TW Hya, submillimetre: planetary systems |
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) |
Funding Information: | Funder Grant number STFC (Science and Technology Facilities Council) ST/T000287/1 MRC (Medical Research Council) MR/T040726/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 06 Jul 2022 09:07 |
Last Modified: | 06 Jul 2022 09:07 |
Status: | Published |
Publisher: | Oxford University Press |
Identification Number: | 10.1093/mnrasl/slac048 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:188375 |