标题： 恒星多重性对原行星盘的影响。 卢pus恒星形成区域的近红外调查 显示英文标题

标题： The effect of stellar multiplicity on protoplanetary discs. A NIR survey of the Lupus star forming region

摘要： 我们展示了利用VLT/NACO对卢瓦斯分子云中的前主序星进行近红外（NIR）自适应光学（AO）调查的结果，以识别分离度低至$\sim$20 au的（次）恒星伴星，并研究多重性对原恒星盘特性的影响。 我们在NIR中首次对总共47个目标进行了观测，并利用档案数据补充了另外58个此前使用同一仪器观测的物体的观测结果。 所有105个目标都有毫米波ALMA数据可用，这些数据提供了对盘质量和大小的限制。 我们总共识别出13个多重系统，包括11个双星和2个三合星。 与之前的研究一致，我们发现最质量大的（M$_{\rm dust}$ $>$ 50 M$_{\oplus}$）和最大的（$R_{\rm dust}>$ 70 au）盘仅出现在没有视觉伴星的恒星周围（分离度为20-4800 au），并且主星倾向于比次星拥有更高质量的盘。 然而，正如最近在Ophiuchus分子云中对$>$个PMS恒星的非常相似的研究中所显示的，对于M$_{\rm dust} < 50$ M$_{\oplus}$的恒星和半径$R_{\rm dust}<$ 70 au，单星和多星系统的盘质量及大小分布是相似的。这些盘对应于样本的$\sim $80-90%。这一结果可以在Lupus和Ophiuchus天体的综合样本中看到，该样本现在包括超过300个目标的ALMA成像和NIR AO数据，并意味着分离度$>$20 au的恒星伴星主要影响盘质量及大小分布中上部的10$\%$。 显示英文摘要

摘要： We present results from a near-infrared (NIR) adaptive optics (AO) survey of pre-main-sequence stars in the Lupus Molecular Cloud with VLT/NACO to identify (sub)stellar companions down to $\sim$20 au separation and investigate the effects of multiplicity on circumstellar disc properties. We observe for the first time in the NIR with AO a total of 47 targets and complement our observations with archival data for another 58 objects previously observed with the same instrument. All 105 targets have millimetre ALMA data available, which provide constraints on disc masses and sizes. We identify a total of 13 multiple systems, including 11 doubles and 2 triples. In agreement with previous studies, we find that the most massive (M$_{\rm dust}$ $>$ 50 M$_{\oplus}$) and largest ($R_{\rm dust}>$ 70 au) discs are only seen around stars lacking visual companions (with separations of 20-4800 au) and that primaries tend to host more massive discs than secondaries. However, as recently shown in a very similar study of $>$200 PMS stars in the Ophiuchus Molecular Cloud, the distribution of disc masses and sizes are similar for single and multiple systems for M$_{\rm dust} < 50$ M$_{\oplus}$ and radii $R_{\rm dust}<$ 70 au. Such discs correspond to $\sim $80-90\% of the sample. This result can be seen in the combined sample of Lupus and Ophiuchus objects, which now includes more than 300 targets with ALMA imaging and NIR AO data, and implies that stellar companions with separations $>$20 au mostly affect discs in the upper 10$\%$ of the disc mass and size distributions.