深而快的太阳系飞掠：有争议的WD 0810-353案例
Deep and fast Solar System flybys: The controversial case of WD 0810-353
摘要：
上下文大多数在银河系盘面上的飞掠都很遥远，超过10，000 AU，并且具有大约70 km/s的特征速度。然而，深度和快速的相遇也会发生，尽管概率较低，特别是如果涉及的物体之一是超新星期间喷出的恒星残骸。WD 0810-353可能是一颗高速的白矮星，它最近被确认为直接飞向太阳系;然而，盖亚DR 3的数据支持它未来的深度和快速飞越被视为可疑。目的。在这里，我们重新分析了与WD 0810-353相关的盖亚DR 3数据集，以确认或拒绝其飞越太阳系的现实，并调查其可能的失控状态。方法.我们使用N体模拟研究了WD 0810-353在时间上的演化。我们计算了最近的方法和它们的相关的近日点通过时间的距离的分布。我们对该物体的运动学进行了统计分析，以评估其可能的超高速。我们比较了它的平均BP/RP光谱与其他研究充分的白矮星。结果我们确认WD 0810-353正朝向太阳系，但实际的遭遇参数强烈依赖于它的径向速度。我们的分析强烈反对盖亚DR 3值为-373.74+/-8.18 km/s。其平均BP/RP光谱表明，基于其推定的Ha线的位置，该值高出10倍以上。然而，使用其他白矮星与非盖亚数据的光谱匹配表明径向速度在（-60，-70）km/s的范围内。结论.这些结果证实了WD 0810-353未来将飞掠太阳系附近，尽管相对速度可能足够高，或者最小接近距离足够大，以排除奥尔特云上的任何重大扰动。
英文摘要：
Context. Most flybys in the Galactic disk are distant, beyond 10,000 AU, and have characteristic velocities of about 70 km/s. However, deep and fast encounters also take place, albeit with lower probability, particularly if one of the objects involved is a stellar remnant ejected during a supernova. WD 0810-353 might be a high velocity white dwarf, and it was recently identified as heading straight for the Solar System; however, the Gaia DR3 data that support its future deep and fast flyby are regarded as suspicious. Aims. Here, we reanalyze the Gaia DR3 data set associated with WD 0810-353 to confirm or reject the reality of its Solar System flyby and also to investigate its possible runaway status. Methods. We studied the evolution of WD 0810-353 forward in time using N-body simulations. We computed the distribution of distances of closest approach and their associated times of perihelion passage. We used a statistical analysis of the kinematics of this object to assess its possible hypervelocity. We compared its mean BP/RP spectrum to those of other well-studied white dwarfs. Results. We confirm that WD 0810-353 is headed for the Solar System, but the actual parameters of the encounter depend strongly on its radial velocity. The Gaia DR3 value of -373.74+/-8.18 km/s is strongly disfavored by our analyses. Its mean BP/RP spectrum suggests a value over ten times higher based on the position of its putative Halpha line. However, spectral matching using other white dwarfs with non-Gaia data indicate a radial velocity in the interval (-60, -70) km/s. Conclusions. These results confirm the future flyby of WD 0810-353 near the Solar System, although the relative velocity could be high enough or the minimum approach distance large enough to preclude any significant perturbation on the Oort cloud.
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