Spin-orbit architecture of planetary systems

Presenter: Yasushi SUTO
The origin of the spin-orbit misalignment in the observe planetary systems remains unsolved. While many models have been proposed to explain the misalignment dynamically including the perturbation due to the nearby star and the orbital instability in the multi-planetary systems, it is also possible that the misalignment is of primordial origin. We present two complementary approaches to this problem; 1) SPH simulations of the protoplanetary disk formation from turbulent gas cloud cores to predict the angle between the protostar spin and disk rotation axes, and 2) numerical modeling of evolution of three protoplanets embedded in the observed HL Tau disk. We then discuss the implications of the two results in the context of the spin-orbit architecture of planetary systems.