改革我们对原恒星多重性和多重性的看法：英仙座分子云的VLA初生盘和多重性（VANDAM）巡天
Revolutionizing our View of Protostellar Multiplicity and Disks: The VLA Nascent Disk and Multiplicity (VANDAM) Survey of the Perseus Molecular Cloud
摘要：
有大量的证据表明，盘形成发生在恒星形成的早期阶段，大多数恒星出生在多个系统中;然而，原恒星的多样性和盘搜索受到低分辨率，样本偏差和可变灵敏度的阻碍。我们进行了一个公正的，高灵敏度的卡尔G。Jansky甚大阵列（VLA）对英仙座分子云中所有已知原恒星（n = 94）的巡天（d~230 pc），分辨率~15 AU（0.06”）在8毫米。我们已经发现了候选原恒星盘向17个来源（其中12个处于0级阶段），我们已经发现了三个0级磁盘候选者的<50 AU尺度的子结构，可能是磁盘碎片化的证据。在这次调查中，我们发现了16个新的多重系统（或新的组分）;新系统的分离度< 500 AU和3 × < 30 AU。我们还发现了一个双峰分布的分离，峰值在~75 AU和~3000 AU，暗示通过两种不同的机制形成：磁盘和湍流碎片。从这次调查的结果表明，在毫米和厘米波长的原恒星系统的统一，公正的调查的必要性和实用性。
英文摘要：
There is substantial evidence for disk formation taking place during the early stages of star formation and for most stars being born in multiple systems; however, protostellar multiplicity and disk searches have been hampered by low resolution, sample bias, and variable sensitivity. We have conducted 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 detected candidate protostellar disks toward 17 sources (with 12 of those in the Class 0 stage) and we have found substructure on < 50AU scales for three Class 0 disk candidates, possibly evidence for disk fragmentation. We have discovered 16 new multiple systems (or new components) in this survey; the new systems have separations < 500 AU and 3 by < 30 AU. We also found a bi-modal distribution of separations, with peaks at ~75 AU and ~3000 AU, suggestive of formation through two distinct mechanisms: disk and turbulent fragmentation. The results from this survey demonstrate the necessity and utility of uniform, unbiased surveys of protostellar systems at millimeter and centimeter wavelengths.
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