论文标题
外部光蒸发式圆盘的观察性解剖结构I：原子碳
The Observational Anatomy of Externally Photoevaporating Planet-Forming Discs I: Atomic Carbon
论文作者
论文摘要
我们证明了CI是光蒸发风的示踪剂，这些示踪剂是由圆盘通过其环境紫外线环境驱动的。通常观察到的CO线仅在相对较弱的紫外线环境中追踪这些风，否则在中间的风中与大多数年轻恒星经历的高紫外线田中分离。但是，CI跟踪中间紫外线环境中风（$ \ sim1000 $ g $ _0 $）的微分运动学签名，可用于对风的运动学和温度放置约束。在CI位置速度图中，外部光蒸发的速度比仅开普勒旋转的速度更快，以及位置 - 速度空间象限的发射，而不会有开普勒发射。这与视角无关，因为风具有垂直于光盘方位角旋转的组件。在中间视角（$ \ sim 30-60^\ circ $）时刻，矩1地图也表现出大尺度上的扭曲形态（与其他导致曲折的过程不同，通常倾向于内盘）。 ALMA很容易观察到CI，这意味着现在可以识别和表征外部光蒸发对中间UV环境中行星形成光盘的影响。
We demonstrate the utility of CI as a tracer of photoevaporative winds that are being driven from discs by their ambient UV environment. Commonly observed CO lines only trace these winds in relatively weak UV environments and are otherwise dissociated in the wind at the intermediate to high UV fields that most young stars experience. However, CI traces unsubtle kinematic signatures of a wind in intermediate UV environments ($\sim1000$G$_0$) and can be used to place constraints on the kinematics and temperature of the wind. In CI position-velocity diagrams external photoevaporation results in velocities that are faster than those from Keplerian rotation alone, as well as emission from quadrants of position-velocity space in which there would be no Keplerian emission. This is independent of viewing angle because the wind has components that are perpendicular to the azimuthal rotation of the disc. At intermediate viewing angles ($\sim 30-60^\circ$) moment 1 maps also exhibit a twisted morphology over large scales (unlike other processes that result in twists, which are typically towards the inner disc). CI is readily observable with ALMA, which means that it is now possible to identify and characterise the effect of external photoevaporation on planet-forming discs in intermediate UV environments.
