选择标准对宽双星系统旋转行为解释的影响
Influence of selection criteria on the interpretation of rotational behaviour of wide-binary star systems
AI总结：
本研究利用Gaia DR3数据分析太阳邻域宽双星系统，发现放宽初始选择标准可消除0.5 pc内的非牛顿运动迹象，表明观察到的异常行为源于外部恒星干扰，结论与牛顿力学一致。
摘要：
双星系统预计会像行星系统一样遵循牛顿动力学。然而，有报告指出，分离距离在约0.01 pc及以上的宽双星系统显示出对标准牛顿运动的潜在偏离。这种现象暗示了星系旋转曲线的变平，需要更仔细的检查。本研究利用由欧洲航天局资助的天基天体测量任务Gaia Data Release 3 (DR3)的数据，对宽双星进行了分析。研究比较了不同的选择标准，以检查太阳邻域内这些明显异常运动学的性质。Gaia数据集提供了详细的参数，包括径向速度、质量、年龄和双星概率，以及标准参数。一个名为BYNARY的定制Python工具促进了数据处理和分析。报告显示，当对解组的初始选择标准放宽而后续过滤保持严格时，任何异常信号的迹象都会系统性减弱，导致在0.5 pc内的双星分离距离下完全消除任何明显的非牛顿运动。研究表明，在130 pc内的太阳邻域宽双星中观察到的任何异常行为，必定是由围绕主星或伴星运行的暗弱伴星，或由飞掠恒星产生的。研究结果强调了选择标准在区分真实双星动力学与外部影响中的重要性。结论与牛顿力学和广义相对论的预测一致，尽管不排除更大尺度上的其他现象。
英文摘要：
Binary star systems are expected to follow Newtonian dynamics similarly to planetary systems. However, reports have been made of wide binary systems with separations around 0.01 pc and larger, showing potential deviations from standard Newtonian motion. This phenomenon, suggestive of the flattening of galactic rotation curves, calls for closer inspection. This study presents an analysis of wide binary stars using data from Gaia Data Release 3 (DR3), a space-based astrometry mission funded by the European Space Agency. The study compares different choices of selection criteria to examine the nature of these apparent anomalous kinematics within the solar neighbourhood. The Gaia data set furnishes detailed parameters, including radial velocity, mass, age, and binary probability in addition to standard parameters. A custom Python tool named BYNARY facilitated both data processing and analysis. This report reveals that the signs of any anomalous signals systematically diminish as the initial selection criteria are relaxed for degrouping while subsequent filtering remains stringent, leading to the complete elimination of any apparent non-Newtonian motion for binary separations within 0.5 pc. The study shows that an y observ ed anomalous behaviour in solar neighbourhood wide binaries within 130 pc must be produced either by faint companion stars orbiting primary or secondary stars, or by flyby stars. The findings emphasize the importance of the choice of selection criteria in disentangling genuine binary dynamics from external influences. The conclusions align with the predictions of Newtonian mechanics and general relativity, though they do not exclude other phenomena at larger scales.
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