Rapid disappearance of a warm, dusty circumstellar disk
Rapid disappearance of a warm, dusty circumstellar disk
复制标题
温暖、尘土飞扬的星周盘迅速消失
作者：
C. Melis;B. Zuckerman;J. H. Rhee;I. Song;S. Murphy;M. Bessell
恒星形成时带有气体和尘埃的星周包层，这些包层迅速沉降成圆盘，最终形成行星系统。了解这些盘的演化过程对于发展一个精确的行星形成理论至关重要，这个理论可以解释迄今为止发现的各种行星系统。类地行星的形成是通过岩石天体在圆盘内的碰撞积累而形成的，这主要是在理论和计算工作中探索的，其中碰撞后喷出物的演变通常被忽略，尽管最近的工作考虑了这种物质的命运。在这里，我们报告的观测一个年轻的，太阳一样的星星（TYC 8241 - 2652 - 1），从碰撞后喷出物的红外线通量急剧下降，约30倍，在不到两年的时间。这颗星星似乎已经从一个类似于太阳系中岩石行星轨道的区域中容纳了大量的尘埃喷出物，到最多保留了少量的较冷的尘埃。这样一个喷出物快速演化的阶段以前没有被预测或观察到，目前没有可用的物理模型令人满意地解释了观测结果。
Stars form with gaseous and dusty circumstellar envelopes, which rapidly settle into disks that eventually give rise to planetary systems. Understanding the process by which these disks evolve is paramount in developing an accurate theory of planet formation that can account for the variety of planetary systems discovered so far. The formation of Earth-like planets through collisional accumulation of rocky objects within a disk has mainly been explored in theoretical and computational work in which post-collision ejecta evolution typically is ignored, although recent work has considered the fate of such material. Here we report observations of a young, Sun-like star (TYC 8241 2652 1) where infrared flux from post-collisional ejecta has decreased drastically, by a factor of about 30, over a period of less than two years. The star seems to have gone from hosting substantial quantities of dusty ejecta, in a region analogous to where the rocky planets orbit in the Solar System, to retaining at most a meagre amount of cooler dust. Such a phase of rapid ejecta evolution has not been previously predicted or observed, and no currently available physical model satisfactorily explains the observations.
DOI：
10.1088/0004-637x/751/1/32
发表时间：
2012
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Stewart S
通讯作者：
Stewart S