杜鹃座-钟表协会中碎片堆积的Herschel PACS观测和模拟
Herschel PACS Observations and Modeling of Debris Disks in the Tucana-Horologium Association
摘要：
我们提出了赫歇尔PACS测光的17个B-M型恒星在30万年的杜鹃座钟表协会。这项工作是赫歇尔开放时间关键计划“原行星系统中的气体”（GASPS）的一部分。在17个目标中，有6个目标的红外辐射量明显大于预期的恒星红外辐射通量，包括HD 30051周围的一个以前未知的圆盘。这六个碎片盘装有单温黑体模型，以估计系统中尘埃的温度和丰度。对于五颗星，显示过量的发射在赫歇尔PACS测光，也有斯皮策IRS光谱，我们适合的数据与模型的光学薄碎片磁盘与现实的颗粒特性，以更好地估计磁盘参数。该模型由一组六个参数确定：表面密度指数，粒度分布指数，最小和最大粒度，以及磁盘的内外半径。最好的拟合参数给我们的约束在这些系统中的灰尘的几何形状，以及总的灰尘质量的下限。通过拟合边缘分辨的PACS 70微米成像，进一步限制了HD 105磁盘。
英文摘要：
We present Herschel PACS photometry of seventeen B- to M-type stars in the 30 Myr-old Tucana-Horologium Association. This work is part of the Herschel Open Time Key Programme "Gas in Protoplanetary Systems" (GASPS). Six of the seventeen targets were found to have infrared excesses significantly greater than the expected stellar IR fluxes, including a previously unknown disk around HD30051. These six debris disks were fitted with single-temperature blackbody models to estimate the temperatures and abundances of the dust in the systems. For the five stars that show excess emission in the Herschel PACS photometry and also have Spitzer IRS spectra, we fit the data with models of optically thin debris disks with realistic grain properties in order to better estimate the disk parameters. The model is determined by a set of six parameters: surface density index, grain size distribution index, minimum and maximum grain sizes, and the inner and outer radii of the disk. The best fitting parameters give us constraints on the geometry of the dust in these systems, as well as lower limits to the total dust masses. The HD105 disk was further constrained by fitting marginally resolved PACS 70 micron imaging.
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