Data di Pubblicazione:
2023
Citazione:
The distribution of accretion rates as a diagnostic of protoplanetary disc evolution / R. Alexander, G. Rosotti, P.J. Armitage, G.J. Herczeg, C.F. Manara, B. Tabone. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 1365-2966. - 524:3(2023), pp. 3948-3957. [10.1093/mnras/stad1983]
Abstract:
We show that the distribution of observed accretion rates is a powerful diagnostic of protoplanetary disc physics. Accretion due to turbulent ('viscous') transport of angular momentum results in a fundamentally different distribution of accretion rates than accretion driven by magnetized disc winds. We find that a homogeneous sample of ≳300 observed accretion rates would be sufficient to distinguish between these two mechanisms of disc accretion at high confidence, even for pessimistic assumptions. Current samples of T Tauri star accretion rates are not this large, and also suffer from significant inhomogeneity, so both viscous and wind-driven models are broadly consistent with the existing observations. If accretion is viscous, the observed accretion rates require low rates of disc photoevaporation (≲10-9 M⊙ yr-1). Uniform, homogeneous surveys of stellar accretion rates can therefore provide a clear answer to the long-standing question of how protoplanetary discs accrete....
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
accretion, accretion discs; planets and satellites: formation; protoplanetary discs; stars: pre-main-sequence
Elenco autori:
R. Alexander, G. Rosotti, P.J. Armitage, G.J. Herczeg, C.F. Manara, B. Tabone
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