Data di Pubblicazione:
2023
Citazione:
Testing protoplanetary disc evolution with CO fluxes / F. Zagaria, S. Facchini, A. Miotello, C.F. Manara, C. Toci, C.J. Clarke. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - 672:(2023), pp. L15.1-L15.10. [10.1051/0004-6361/202346164]
Abstract:
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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
accretion, accretion disks; planets and satellites: formation; protoplanetary disks; stars: pre-main sequence; submillimeter: planetary systems
Elenco autori:
F. Zagaria, S. Facchini, A. Miotello, C.F. Manara, C. Toci, C.J. Clarke
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