Observations of Circumstellar Disks

摘要: This review presents recent results on protoplanetary disks obtained from angularly resolved observations. Observations with mm arrays show that are in Keplerian rotation, radius as large 1000 AU. Optical images to be flared. Both type of observations imply the dust disk has evolved and grown interstellar dust. Measurement gas temperature CO isotopes indicate gradient, consistent flaring heating by central star. Disks which appear have started dissipate their initial content also been discovered, but very diverse aspects leaves dissipation process unclear. Current data mostly concern outer (>50 AU), although near-IR interferometry unveil innermost regions (<1 AU). The next generation instruments (MIDI VLTI, ALMA) will allow probe intermediate regime, where planet formation is expected occur.