The Solar Neighborhood. XLIX. New Discoveries and Orbits of M-dwarf Multiples with Speckle Interferometry at SOAR
The Solar Neighborhood. XLIX. New Discoveries and Orbits of M-dwarf Multiples with Speckle Interferometry at SOAR
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DOI：
10.3847/1538-3881/ac52f6
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发表时间：
2022-02
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影响因子：
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通讯作者：
E. Vrijmoet;A. Tokovinin;T. Henry;J. Winters;E. Horch;W. Jao
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作者：
E. Vrijmoet;A. Tokovinin;T. Henry;J. Winters;E. Horch;W. Jao
我们给出了一个在25pC内绘制M-矮星倍数轨道图的多年计划的第一个结果。这些观测主要是在2019-2020年期间使用智利南方天体物理研究望远镜的散斑干涉法，使用安装在自适应光学模块(HRCam+SAM)上的高分辨率相机进行的。附近M矮星的样本来自三个来源：RECONS长期天体测量监测计划在SMARTS 0.9米处的倍数；已知倍数，这些新观测将启用或改善轨道拟合；以及GAIA数据发布2(DR2)中由其天体测量拟合标记的候选倍数。我们通过830次散斑观测，调查了338颗M矮星中的333颗，探测到了63%的恒星伴星。最值得注意的是，这包括从Gaia DR2中选择的76%的子集的新伙伴。总之，我们首次向观测到的M矮星报告了97个新的恒星伴星的直接探测。在这里，我们介绍了这些探测的性质，每个探测不到的极限，以及作为本程序的一部分已经观测到的周期为0.67-29年的五个轨道。探测到的伴星与它们的主星的距离为0.“024-2.”0(0.25-66 Au)，并具有ΔI≲5.0mag。这项多年的活动最终将绘制附近M矮星的完整轨道图，周期长达3年，并提供关键的历元，将双星的轨道测定延长到30年。
We present the first results of a multiyear program to map the orbits of M-dwarf multiples within 25 pc. The observations were conducted primarily during 2019–2020 using speckle interferometry at the Southern Astrophysical Research Telescope in Chile, using the High-Resolution Camera mounted on the adaptive optics module (HRCam+SAM). The sample of nearby M dwarfs is drawn from three sources: multiples from the RECONS long-term astrometric monitoring program at the SMARTS 0.9 m; known multiples, for which these new observations will enable or improve orbit fits; and candidate multiples flagged by their astrometric fits in Gaia Data Release 2 (DR2). We surveyed 333 of our 338 M dwarfs via 830 speckle observations, detecting companions for 63% of the stars. Most notably, this includes new companions for 76% of the subset selected from Gaia DR2. In all, we report the first direct detections of 97 new stellar companions to the observed M dwarfs. Here we present the properties of those detections, the limits of each nondetection, and five orbits with periods 0.67–29 yr already observed as part of this program. Companions detected have projected separations of 0.″024–2.″0 (0.25–66 au) from their primaries and have ΔI ≲ 5.0 mag. This multiyear campaign will ultimately map complete orbits for nearby M dwarfs with periods up to 3 yr, and provide key epochs to stretch orbital determinations for binaries to 30 yr.