论文标题
与Gaia DR3的螺旋臂宿主的恒星Flyby分析
Stellar Flyby Analysis for Spiral Arm Hosts with Gaia DR3
论文作者
论文摘要
散射的光成像研究已经检测到偶尔磁盘中的近二打螺旋臂系统，但是大多数人的形成机制仍在争论中。尽管现有的研究可以使用运动测量结果来区分诸如行星 - 磁盘相互作用和磁盘自我的领先机制，但是近距离的恒星飞质可以诱导短寿命的螺旋，甚至激发了臂行驱动的行星，使其成为高度偏心的轨道。在Gaia DR3的前所未有的恒星位置和适当的运动测量中，我们在这里研究了已知的螺旋臂系统，通过制定一个分析性的在天空飞行框架上，他们与他们的恒星邻居一起使用了他们的flyby历史。对于目前位于螺旋宿主10 pc之内的恒星邻居来说，我们将飞行时间限制为在过去的$ 10^4 $ yr之内，而flyby距离的距离为$ 10 $ $ 10 $乘以零散的光度。在Gaia DR3中以20美元的螺旋系统中确定的总计$ 12570 $的邻居中，我们没有确定可靠的孤立系统候选人。我们的分析表明，最近的Flyby不是散射光中孤立的螺旋系统的主要形成机制。
Scattered light imaging studies have detected nearly two dozen spiral arm systems in circumstellar disks, yet the formation mechanisms for most of them are still under debate. Although existing studies can use motion measurements to distinguish leading mechanisms such as planet-disk interaction and disk self-gravity, close-in stellar flybys can induce short-lived spirals and even excite arm-driving planets into highly eccentric orbits. With unprecedented stellar location and proper motion measurements from Gaia DR3, here we study for known spiral arm systems their flyby history with their stellar neighbours by formulating an analytical on-sky flyby framework. For stellar neighbors currently located within 10 pc from the spiral hosts, we restrict the flyby time to be within the past $10^4$ yr and the flyby distance to be within $10$ times the disk extent in scattered light. Among a total of $12570$ neighbors that are identified in Gaia DR3 for $20$ spiral systems, we do not identify credible flyby candidates for isolated systems. Our analysis suggests that close-in recent flyby is not the dominant formation mechanism for isolated spiral systems in scattered light.
