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Unveiling the outer dust disc of TW Hya with deep ALMA observations

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posted on 2022-07-04, 08:12 authored by John D Ilee, Catherine Walsh, Jeff Jennings, Richard A Booth, Giovanni P Rosotti, Richard Teague, Takashi Tsukagoshi, Hideko Nomura

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.

History

Citation

Monthly Notices of the Royal Astronomical Society: Letters, Volume 515, Issue 1, September 2022, Pages L23–L28, https://doi.org/10.1093/mnrasl/slac048

Author affiliation

Department of Physics and Astronomy, University of Leicester

Version

  • AM (Accepted Manuscript)

Published in

Monthly Notices of the Royal Astronomical Society: Letters

Volume

515

Issue

1

Pagination

L23 - L28

Publisher

Oxford University Press (OUP)

eissn

1745-3933

Acceptance date

2022-04-29

Copyright date

2022

Available date

2022-07-04

Language

en

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