"Infrared images from the W. M. Keck Observatory reveal an important clue in the configuration of dust confined to a solar-system sized region close to the star: the dust orbits in a plane that is offset by approximately 14 degrees from that of the outer disk. Moreover, the offset is in the opposite direction from that of a larger scale warp detected previously by Hubble Space Telescope. This double warp is believed to be due to the presence of one or more unseen planets and constitutes one of the strongest pieces of evidence yet which links observations of circumstellar disks to the actual formation of planets."
http://www2.keck.hawaii.edu:3636/realpublic/gen_info/kiosk/news/youngplanets.html