论文标题
深太阳系Flybys：WD 0810-353的有争议案例
Deep and fast Solar System flybys: The controversial case of WD 0810-353
论文作者
论文摘要
语境。银河磁盘中的大多数飞质是遥远的，超过10,000 au，并且特征性速度约为70 km/s。但是，尽管概率较低，但也发生了深度和快速的相遇，尤其是当涉及的一个物体之一是超新星期间弹出的恒星残留物。 WD 0810-353可能是高速速度白色矮人，最近被确定为太阳系的直线。但是，支持其未来深层和快速飞行的Gaia DR3数据被认为是可疑的。 目标。在这里，我们重新分析了与WD 0810-353相关的GAIA DR3数据集，以确认或拒绝其太阳系Flyby的现实，并研究其可能的失控状态。 方法。我们使用N体模拟研究了WD 0810-353的演变。我们计算了最接近方法的距离及其相关时间的分布。我们使用了该对象的运动学的统计分析来评估其可能的超速度。我们将其平均BP/RP光谱与其他研究精心熟悉的白色矮人的光谱进行了比较。 结果。我们确认WD 0810-353是前往太阳系的，但是相遇的实际参数在很大程度上取决于其径向速度。我们的分析强烈不利于-373.74 +/- 8.18 km/s的GAIA DR3值。它的平均BP/RP光谱表明，根据其假定的HALPHA线的位置，值高10倍。但是，使用其他白色矮人与非GAIA数据进行匹配表明在（-60，-70）km/s间隔中的径向速度。 结论。这些结果证实了WD 0810-353在太阳系附近的未来飞越，尽管相对速度可能足够高或最小进近距离足够大，足以排除在Oort云上的任何明显扰动。
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.
