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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Study of infrared excess from circumstellar disks in binaries with Spitzer/IRAC
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Study of infrared excess from circumstellar disks in binaries with Spitzer/IRAC

机译：用Spitzer / IRAC研究二进制卫星中圆盘的红外过量

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摘要

The presence of excess emission in the 3.6-8.0 mu m region was investigated in a sample of 27 binary star systems located in two nearby star-forming regions, Taurus and Ophiuchus, by using Spitzer/Infrared Array Camera (IRAC) archival data. Angular (Projected) separations of the binaries are greater than 2 '' (similar to 280 au), which enables us to perform spatially resolved photometry of individual primary and secondary sources. The measured occurrence of infrared excess suggests that binarity plays a role in the evolution of circumstellar disks, even at such wide binary separations. Most of the binaries have excess emission from both the circumprimary and circumsecondary disks, or show photospheric levels for both components at all four wavelengths of IRAC. On the other hand, four binary systems (17(-8)(+11) % , designated by "mixed" systems) exhibit the excess emission from a single binary component. This ratio is significantly smaller than that predicted by the random pairing of single stars, suggesting that circumprimary and circumsecondary disks are synchronously dispersed. In addition, the excess frequencies (EFs) of primary and secondary sources with a projected distance of ap similar or equal to 280-450 au are 100(17)(+0)% and 91(-18)(+8)% , respectively, and significantly higher than that of single stars (70%+/- 5%). We made a simple model describing the EF distribution as a function of the disk outer radius, Rout. Comparisons with observations using the Kolmogorov-Smirnov test show that the observational data are consistent with the model when the EF similar or equal to 100% region is found at R-out similar to 30-100 au. This disk radius is smaller than that typically estimated for single stars. The high EF of circumstellar disks with these radii may indicate a prolonged lifetime of dust in binary systems, possibly because the smaller disks counteract mass loss by photoevaporation.
机译：通过使用Spitzer /红外阵列照相机（IRAC）档案数据，对位于两个附近的恒星形成区Taurus和Ophiuchus的27个双星系统的样本进行了研究，研究了3.6-8.0μm区域中过量排放的存在。二进制文件的角（投影）间距大于2英寸（类似于280 au），这使我们能够对单个主光源和副光源执行空间分辨光度法。测得的红外过剩现象表明，即使在如此宽的二元间隔下，二元性在圆盘的演化中也起作用。大多数二进制文件都具有来自周向和周向磁盘的过量发射，或者在IRAC的所有四个波长处都显示两个组件的光球能级。另一方面，四个二进制系统（由“混合”系统指定的17（-8）（+ 11）％）表现出来自单个二进制组件的过量发射。该比率显着小于单颗星随机配对所预测的比率，这表明周向盘和周向盘是同步分散的。此外，投影距离ap等于或等于280-450 au的一次和二次信号源的超额频率（EFs）为100（17）（+ 0）％和91（-18）（+ 8）％，分别显着高于单颗星（70％+ /-5％）。我们制作了一个简单的模型，将EF分布描述为磁盘外半径Rout的函数。与使用Kolmogorov-Smirnov检验的观察结果进行比较表明，当在R出端发现30-100 au的EF相似或等于100％区域时，观察到的数据与模型一致。该圆盘半径小于通常为单颗星估计的圆盘半径。具有这些半径的星际盘的高EF值可能表明二元系统中粉尘的寿命延长，可能是因为较小的盘抵消了光蒸发引起的质量损失。

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