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We present SubMillimeter-Array observations of a Keplerian disk around theClass I protobinary system L1551 NE in 335 GHz continuum emission andsubmillimeter line emission in 13CO (J=3-2) and C18O (J=3-2) at a resolution of~120 x 80 AU. The 335-GHz dust-continuum image shows a strong central peakclosely coincident with the binary protostars and likely corresponding tocircumstellar disks, surrounded by a ~600 x 300 AU feature elongatedapproximately perpendicular to the [Fe II] jet from the southern protostellarcomponent suggestive of a circumbinary disk. The 13CO and C18O images confirmthat the circumbinary continuum feature is indeed a rotating disk; furthermore,the C18O channel maps can be well modeled by a geometrically-thin diskexhibiting Keplerian rotation. We estimate a mass for the circumbinary disk of~0.03-0.12 Msun, compared with an enclosed mass of ~0.8 Msun that is dominatedby the protobinary system. Compared with several other Class I protostars knownto exhibit Keplerian disks, L1551 NE has the lowest bolometric temperature (~91K), highest envelope mass (~0.39 Msun), and the lowest ratio in stellar mass toenvelope + disk + stellar mass (~0.65). L1551 NE may therefore be the youngestprotostellar object so far found to exhibit a Keplerian disk. Our observationspresent firm evidence that Keplerian disks around binary protostellar systems,``Keplerian circumbinary disks', can exist. We speculate that tidal effectsfrom binary companions could transport angular momenta toward the inner edge ofthe circumbinary disk and create the Keplerian circumbinary disk.

A Keplerian Circumbinary Disk around the Protobinary System L1551 NE