Gas accretion onto Jupiter mass planets in discs with laminar accretion flows

Context. Numerous studies have shown that a gap-forming Jovian mass planet embedded in protoplanetary disc, which turbulent viscosity operates, can accrete gas efficiently through the gap, and for typical parameters it doubles its ~0.1 Myr. The also migrates inwards on timescale is closely related to local viscous evolution timescale, typically 0.1 These timescales are short compared disc lifetimes, raise questions about origins of cold giant exoplanets been discovered abundance. It understood discs unlikely be globally turbulent, instead they may launch magnetised winds such accretion towards star occurs laminar flows located narrow layers near surfaces disc. Aims. aim this study examine rate at accretes onto planets layered discs, compare results with those obtained models. Methods. We use 3D hydrodynamical simulations constant radial flux ṁ = 10 −8 M ⊙ yr −1 sustained. consider classical α model, models an external torque applied surface mimic effects wind. accreting variety depths, as parameterised by their column densities Σ A , we values range 0.1−10 g cm −2 . Results. model gives agreement previous studies. In accord our recent work examines migration models, find crucially depends ability block wind-induced flow star. For slow, doubling time Myr obtained. not blocked, fast, 0.2 Conclusions. Our show although always adopting different leads very rates planets.