posted on 2022-10-03, 16:00authored byJeff Jennings, Marco Tazzari, Cathie J Clarke, Richard A Booth, Giovanni P Rosotti
The 1.33-mm survey of protoplanetary discs in the Taurus molecular cloud found annular gaps and rings to be common in extended sources (≥ 55au), when their 1D visibility distributions were fit parametrically. We first demonstrate the advantages and limitations of non-parametric visibility fits for data at the survey's 0.12-arcsec resolution. Then we use the non-parametric model in Frankenstein (frank) to identify new substructure in three compact and seven extended sources. Among the new features, we identify three trends: a higher occurrence rate of substructure in the survey's compact discs than previously seen, underresolved (potentially azimuthally asymmetric) substructure in the innermost disc of extended sources, and a 'shoulder' on the trailing edge of a ring in discs with strong depletion at small radii. Noting the shoulder morphology is present in multiple discs observed at higher resolution, we postulate it is tracing a common physical mechanism. We further demonstrate how a superresolution frank brightness profile is useful in motivating an accurate parametric model, using the highly structured source DL Tau in which frank finds two new rings. Finally, we show that sparse (u, v) plane sampling may be masking the presence of substructure in several additional compact survey sources.
Funding
Netherlands Organization for Scientific Research (NWO, program number 016.Veni.192.233)
Connecting theories and observations of planet formation
European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 823823 (DUSTBUSTERS)
European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programmes PEVAP (grant agreement number 853022)
Munich Institute for Astro- and Particle Physics (MIAPP) that is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy – EXC-2094 - 390783311
History
Author affiliation
School of Physics and Astronomy, University of Leicester
Version
AM (Accepted Manuscript)
Published in
Monthly Notices of the Royal Astronomical Society
Volume
514
Issue
4
Pagination
6053 - 6073
Publisher
Oxford University Press (OUP) for Royal Astronomical Society