太阳邻居XLVI。揭示新的M矮星双星及其轨道结构
The Solar Neighborhood. XLVI. Revealing New M Dwarf Binaries and their Orbital Architectures
摘要：
我们使用20年的天体测量数据从CTIO/SMARTS 0.9-m的RECONS计划，以提供新的见解在太阳附近的多个恒星系统。我们为210个系统提供了新的和更新的天体测量轨道，并推导出9个高质量的天体测量轨道，周期为2.49 - 16.63年。使用共542个系统的从RECONS的反射，我们比较系统在25秒差距内的盖亚DR 2定义的标准，从DR 2的结果选择未解决的天体测量多次波。我们发现DR 2中25 pc以内的四个未解析多星红矮星系统中有三个具有视差误差$\geq 0.32$ mas、astrometric_gof_al $\geq 56$、astrometric_excess_noise_sig $\geq 108.0$、ruwe $\geq 2.0$和视差大于$\sim$ 10%的差异。这些标准广泛适用于任何针对附近恒星的工作，从寻找双星系统的研究到针对单星的行星搜索。
英文摘要：
We use 20 years of astrometric data from the RECONS program on the CTIO/SMARTS 0.9-m to provide new insight into multiple star systems in the solar neighborhood. We provide new and updated parallaxes for 210 systems and derive nine high-quality astrometric orbits with periods of 2.49 - 16.63 years. Using a total of 542 systems' parallaxes from RECONS, we compare systems within 25 parsecs to Gaia DR2 to define criteria for selecting unresolved astrometric multiples from the DR2 results. We find that three out of four unresolved multi-star red dwarf systems within 25 pc in DR2 have parallax_error $\geq 0.32$ mas, astrometric_gof_al $\geq 56$, astrometric_excess_noise_sig $\geq 108.0$, ruwe $\geq 2.0$, and parallaxes more than $\sim$10% different than the long-term RECONS results. These criteria have broad applications to any work targeting nearby stars, from studies seeking binary systems to efforts targeting single stars for planet searches.
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