ARMADA. II. Further Detections of Inner Companions to Intermediate-mass Binaries with Microarcsecond Astrometry at CHARA and VLTI
ARMADA. II. Further Detections of Inner Companions to Intermediate-mass Binaries with Microarcsecond Astrometry at CHARA and VLTI
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DOI：
10.3847/1538-3881/ac8eae
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发表时间：
2022-09
期刊：
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通讯作者：
T. Gardner;J. Monnier;F. Fekel;J. L. Bouquin;Adam Scovera;G. Schaefer;S. Kraus;F. Adams;N. Anugu;J. Berger;T. Brummelaar;C. Davies;J. Ennis;D. Gies;K. Johnson;P. Kervella;K. Kratter;A. Labdon;C. Lanthermann;J. Sahlmann;Benjamin R. Setterholm Univ. of Michigan;Tennessee State University;U. G. Alpes;The Chara Array;U. Exeter;U. Michigan;U. Wisconsin;O. Paris;U. Arizona;E. Observatory;European Space Astronomy Center
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作者：
T. Gardner;J. Monnier;F. Fekel;J. L. Bouquin;Adam Scovera;G. Schaefer;S. Kraus;F. Adams;N. Anugu;J. Berger;T. Brummelaar;C. Davies;J. Ennis;D. Gies;K. Johnson;P. Kervella;K. Kratter;A. Labdon;C. Lanthermann;J. Sahlmann;Benjamin R. Setterholm Univ. of Michigan;Tennessee State University;U. G. Alpes;The Chara Array;U. Exeter;U. Michigan;U. Wisconsin;O. Paris;U. Arizona;E. Observatory;European Space Astronomy Center
我们开始利用 CHARA/MIRC-X 和 VLTI/GRAVITY 进行调查，寻找围绕中等质量双星系统各个组件运行的低质量伴星。凭借这些仪器令人难以置信的精度，我们可以检测到伴星小至几十微角秒的天体测量“摆动”。这使我们能够检测二进制文件列表中任何以前未见过的三重系统。我们展示了围绕早期 F 型至 B 型双星的 12 个伴星的轨道，其中 9 个是新检测到的，其中 3 个是已知径向速度 (RV) 伴星的首次天体测量检测。这些新检测到的成分的质量范围为 0.45 至 1.3 M ⊙。我们的轨道将这些系统限制在较高的天体测量精度，在大多数情况下，轨道拟合的中值残差为 20-50 μas。对于其中七个系统，我们包含了新获得的 RV 数据，这有助于我们识别系统配置并在某些情况下解决大量单个组件的问题。尽管需要额外的 RV 测量来打破相互倾角的简并性，但我们发现这些内部三元组中的大多数与宽双星轨道没有很好地对齐。这表明，与太阳和低质量三重粒子相比，较高质量三重粒子的错位程度更大，尽管需要对调查偏差进行彻底研究。我们表明，ARMADA 调查在发现双星中以前未见过的伴星方面非常成功。该方法将在即将发表的论文中使用，以将中等质量双星系统中的伴星人口统计限制到行星质量状态。
We started a survey with CHARA/MIRC-X and VLTI/GRAVITY to search for low-mass companions orbiting individual components of intermediate-mass binary systems. With the incredible precision of these instruments, we can detect astrometric “wobbles” from companions down to a few tens of microarcseconds. This allows us to detect any previously unseen triple systems in our list of binaries. We present the orbits of 12 companions around early F- to B-type binaries, 9 of which are new detections and 3 of which are first astrometric detections of known radial velocity (RV) companions. The masses of these newly detected components range from 0.45 to 1.3 M ⊙. Our orbits constrain these systems to a high astrometric precision, with median residuals to the orbital fit of 20–50 μas in most cases. For seven of these systems we include newly obtained RV data, which help us to identify the system configuration and to solve for masses of individual components in some cases. Although additional RV measurements are needed to break degeneracy in the mutual inclination, we find that the majority of these inner triples are not well aligned with the wide binary orbit. This hints that higher-mass triples are more misaligned compared to solar and lower-mass triples, though a thorough study of survey biases is needed. We show that the ARMADA survey is extremely successful at uncovering previously unseen companions in binaries. This method will be used in upcoming papers to constrain companion demographics in intermediate-mass binary systems down to the planetary-mass regime.