Retrograde Ring Formed Around Eccentric Extrasolar Giant Planet

We investigate the accretion flow around a giant planet using two-dimensional hydrodynamical simulations by studying the local region of accretion disk around the planet. The results show that, when the initial orbit of the planet embedded in protoplanetary disk is eccentric, the accretion disk formed around the planet is retrograde during the evolution and may be a possible origin of the retrograde ring around eccentric extrasolar giant planet.