Turbulence in circumstellar disks

Franck Hersant (1, 2, 3, 4) , B. Dubrulle (1) , Jean-Marc Huré (5, 6)

1 SPEC - UMR3680 - Service de physique de l'état condensé
2 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
3 Pôle Planétologie du LESIA
4 ZAH - Zentrum für Astronomie der Universität Heidelberg
5 LUTH (UMR_8102) - Laboratoire Univers et Théories
6 UPCité - Université Paris Cité

We investigate the relationship between circumstellar disks and the Taylor-Couette flow. Using the Reynolds similarity principle, this results in a number of parameter-free predictions about stability of the disks, and their turbulent transport properties, provided the disk structure is available. We discuss how the latter can be deduced from interferometric observations of circumstellar material. We use the resulting disk structure to compute the molecular transport coefficients, including the effect of ionization by the central object. The resulting control parameter indicates that the disk is well into the turbulent regime. The analogy is also used to compute the effective accretion rate, as a function of the disk characteristic parameters (orbiting velocity, temperature and density). These values are in very good agreement with experimental, parameter-free predictions derived from the supposed relationship. The turbulent viscosity is also computed and found to correspond to an alpha-parameter 2× 10^-4

Domaines: Astrophysique [astro-ph]

Franck Hersant, B. Dubrulle, Jean-Marc Huré. Turbulence in circumstellar disks. Astronomy and Astrophysics - A&A, 2005, 429, pp.531-542. ⟨10.1051/0004-6361:200400082⟩. ⟨hal-03785863⟩