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There is substantial evidence for disk formation taking place during theearly stages of star formation and for most stars being born in multiplesystems; however, protostellar multiplicity and disk searches have beenhampered by low resolution, sample bias, and variable sensitivity. We haveconducted an unbiased, high-sensitivity Karl G. Jansky Very Large Array (VLA)survey toward all known protostars (n = 94) in the Perseus molecular cloud(d~230 pc), with a resolution of ~15 AU (0.06") at 8 mm. We have detectedcandidate protostellar disks toward 17 sources (with 12 of those in the Class 0stage) and we have found substructure on < 50AU scales for three Class 0 diskcandidates, possibly evidence for disk fragmentation. We have discovered 16 newmultiple systems (or new components) in this survey; the new systems haveseparations < 500 AU and 3 by < 30 AU. We also found a bi-modal distribution ofseparations, with peaks at ~75 AU and ~3000 AU, suggestive of formation throughtwo distinct mechanisms: disk and turbulent fragmentation. The results fromthis survey demonstrate the necessity and utility of uniform, unbiased surveysof protostellar systems at millimeter and centimeter wavelengths.

Revolutionizing our View of Protostellar Multiplicity and Disks: The VLA Nascent Disk and Multiplicity (VANDAM) Survey of the Perseus Molecular Cloud