The Solar Neighborhood. XLVI. Revealing New M Dwarf Binaries and Their Orbital Architectures
The Solar Neighborhood. XLVI. Revealing New M Dwarf Binaries and Their Orbital Architectures
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DOI：
10.3847/1538-3881/abb4e9
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发表时间：
2020-08
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影响因子：
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通讯作者：
E. Vrijmoet;T. Henry;W. Jao;S. Dieterich
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作者：
E. Vrijmoet;T. Henry;W. Jao;S. Dieterich
我们使用来自托洛洛山美洲天文台/SMARTS 0.9 m 望远镜的近邻恒星研究联盟 (RECONS) 计划 20 年的天体测量数据，为太阳附近的多个恒星系统提供新的见解。我们为 210 个系统提供新的和更新的视差，并得出九个周期为 2.49-16.63 年的高质量天体测量轨道。使用来自 RECONS 的总共 542 个系统的视差，我们将 25 pc 内的系统与 Gaia DR2 进行比较，以定义从 DR2 结果中选择未解析的天体测量倍数的标准。我们发现，DR2 中 25 pc 内的四个未解析多星红矮星系统中，四分之三的 parallax_error ≥ 0.32 mas，astrometric_gof_al ≥ 56，astrometric_excess_noise_sig ≥ 108.0，ruwe ≥ 2.0，且视差与长期 RECONS 结果相差超过 ∼10%。这些标准对于任何针对附近恒星的工作都有广泛的应用，从寻找双星系统的研究到针对单星进行行星搜索的工作。
We use 20 yr of astrometric data from the REsearch Consortium On Nearby Stars (RECONS) program on the Cerro Tololo Inter-American Observatory/SMARTS 0.9 m telescope 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 yr. Using a total of 542 systems’ parallaxes from RECONS, we compare systems within 25 pc to Gaia DR2 to define criteria for selecting unresolved astrometric multiples from the DR2 results. We find that three out of four unresolved multistar red dwarf systems within 25 pc in DR2 have parallax_error ≥ 0.32 mas, astrometric_gof_al ≥ 56, astrometric_excess_noise_sig ≥ 108.0, ruwe ≥ 2.0, and parallaxes more than ∼10% different from 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.