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A super-resolution analysis of the DSHARP survey: substructure is common in the inner 30 au

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journal contribution
posted on 2022-01-25, 10:41 authored by Jeff Jennings, Richard A Booth, Marco Tazzari, Cathie J Clarke, Giovanni P Rosotti
The DSHARP survey evidenced the ubiquity of substructure in the mm dust distribution of large, bright protoplanetary discs. Intriguingly, these data sets have yet higher resolution information that is not recovered in a CLEAN image. We first show that the intrinsic performance of the CLEAN algorithm is resolution-limited. Then analysing all 20 DSHARP sources using the 1D, super-resolution code FRANKenstein (FRANK), we accurately fit the 1D visibilities to a mean factor of 4.3 longer baseline than the Fourier transform of the CLEAN images and a factor of 3.0 longer baseline than the transform of the CLEAN component models. This yields a higher resolution brightness profile for each source, identifying new substructure interior to 30 au in multiple discs; resolving known gaps to be deeper, wider, and more structured; and known rings to be narrower and brighter. Across the survey, high contrast gaps are an average 14 per cent wider and 44 per cent deeper in the FRANK profiles relative to CLEAN, and high contrast rings are an average 26 per cent narrower. Categorizing the FRANK brightness profiles into trends, we find that the relative scarcity of features interior to 30 au in the survey’s CLEAN images is an artefact of resolving power, rather than an intrinsic rarity of inner disc (or compact disc) substructure. Finally the rings in the FRANK profiles are narrower than the previously inferred deconvolved widths, indicating smaller α/St ratios in the local gas disc.

History

Citation

Monthly Notices of the Royal Astronomical Society, Volume 509, Issue 2, January 2022, Pages 2780–2799, https://doi.org/10.1093/mnras/stab3185

Author affiliation

Department of Physics and Astronomy

Version

  • AM (Accepted Manuscript)

Published in

Monthly Notices of the Royal Astronomical Society

Volume

509

Issue

2

Pagination

2780 - 2799

Publisher

Oxford University Press (OUP) for Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Acceptance date

2022-10-29

Copyright date

2021

Available date

2022-01-25

Language

English

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