Issue |
A&A
Volume 672, April 2023
|
|
---|---|---|
Article Number | L15 | |
Number of page(s) | 10 | |
Section | Letters to the Editor | |
DOI | https://doi.org/10.1051/0004-6361/202346164 | |
Published online | 21 April 2023 |
Letter to the Editor
Testing protoplanetary disc evolution with CO fluxes
A proof of concept in Lupus and Upper Sco
1
Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
e-mail: fz258@cam.ac.uk
2
European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany
3
Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy
Received:
16
February
2023
Accepted:
4
April
2023
The Atacama Large Millimeter/submillimeter Array (ALMA) revolutionised our understanding of protoplanetary discs. However, the available data have not given conclusive answers yet on the underlying disc evolution mechanisms: viscosity or magnetohydrodynamic (MHD) winds. Improving upon the current results, mostly based on the analysis of disc sizes, is difficult because larger, deeper, and higher angular resolution surveys would be required, which could be prohibitive even for ALMA. In this Letter we introduce an alternative method to study disc evolution based on 12CO fluxes. Fluxes can be readily collected using less time-consuming lower resolution observations, while tracing the same disc physico-chemical processes as sizes: assuming that 12CO is optically thick, fluxes scale with the disc surface area. We developed a semi-analytical model to compute 12CO fluxes and benchmarked it against the results of DALI thermochemical models, recovering an agreement within a factor of three. As a proof of concept we compared our models with Lupus and Upper Sco data, taking advantage of the increased samples, by a factor 1.3 (Lupus) and 3.6 (Upper Sco), when studying fluxes instead of sizes. Models and data agree well only if CO depletion is considered. However, the uncertainties on the initial conditions limited our interpretation of the observations. Our new method can be used to design future ad hoc observational strategies to collect better data and give conclusive answers on disc evolution.
Key words: accretion, accretion disks / planets and satellites: formation / protoplanetary disks / stars: pre-main sequence / submillimeter: planetary systems
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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