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arXiv 0705.3408astro-ph
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外太阳系重力测试:来自海王星外天体的结果

Testing Gravity in the Outer Solar System: Results from Trans-Neptunian Objects

John F. Wallin, David S. Dixon, Gary L. Page

摘要:

重力平方反比定律在距离约10天文单位的实验测试中探测得很差。最近对先驱者10号和11号航天器轨道的分析表明,在距离太阳超过20天文单位时,有一个未建模的朝向太阳的加速度,这是任何明显的航天器系统学都无法解释的。如果这种加速度代表偏离牛顿引力,或者表明太阳系外的质量分布,那么它应该在海王星外天体(TNO)的轨道上可以检测到。为了限制牛顿引力的偏差,我们选择了一个观测良好的TNO样本,这些样本在距离太阳20到100 AU的轨道上运行。通过用改进的轨道拟合软件检查它们的轨道,我们对太阳系这一区域可能存在的引力扰动进行了严格的限制。

英文摘要:

The inverse square law of gravity is poorly probed by experimental tests at distances of ~ 10 AUs. Recent analysis of the trajectory of the Pioneer 10 and 11 spacecraft have shown an unmodeled acceleration directed toward the Sun which was not explained by any obvious spacecraft systematics, and occurred when at distances greater than 20 AUs from the Sun. If this acceleration represents a departure from Newtonian gravity or is indicative of an additional mass distribution in the outer solar system, it should be detectable in the orbits of Trans-Neptunian Objects (TNOs). To place limits on deviations from Newtonian gravity, we have selected a well observed sample of TNOs found orbiting between 20 and 100 AU from the Sun. By examining their orbits with modified orbital fitting software, we place tight limits on the perturbations of gravity that could exist in this region of the solar system.

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