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首页> 外文期刊>The Astrophysical Journal. Supplement Series >The Spitzer Infrared Spectrograph survey of T Tauri stars in Taurus
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The Spitzer Infrared Spectrograph survey of T Tauri stars in Taurus

机译：Spitzer红外光谱仪对金牛座T Tauri星的测量

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摘要

We present 161 Spitzer Infrared Spectrograph (IRS) spectra of TTauri stars and young brown dwarfs in the Taurus star-forming region. All of the targets were selected based on their infrared excess and are therefore surrounded by protoplanetary disks; they form the complete sample of all available IRS spectra of TTauri stars with infrared excesses in Taurus. We also present the IRS spectra of seven Class0/I objects in Taurus to complete the sample of available IRS spectra of protostars in Taurus. We use spectral indices that are not significantly affected by extinction to distinguish between envelope- and disk-dominated objects. Together with data from the literature, we construct spectral energy distributions for all objects in our sample. With spectral indices derived from the IRS spectra we infer disk properties such as dust settling and the presence of inner disk holes and gaps. We find a transitional disk frequency, which is based on objects with unusually large 13-31 μm spectral indices indicative of a wall surrounding an inner disk hole, of about 3%, and a frequency of about 20% for objects with unusually large 10 μm features, which could indicate disk gaps. The shape and strength of the 10 μm silicate emission feature suggests weaker 10 μm emission and more processed dust for very low mass objects and brown dwarfs (spectral types M6-M9). These objects also display weaker infrared excess emission from their disks, but do not appear to have more settled disks than their higher-mass counterparts. We find no difference for the spectral indices and properties of the dust between single and multiple systems.
机译：我们介绍了金牛座恒星形成区中TTauri恒星和年轻的棕色矮星的161 Spitzer红外光谱仪（IRS）光谱。所有目标都是根据其红外过量选择的，因此被原行星盘包围;它们构成了Tauuri恒星的所有可用IRS光谱的完整样本，其中Taurus的红外过量。我们还介绍了金牛座中七个Class0 / I对象的IRS光谱，以完成金牛座原恒星可用IRS光谱的样本。我们使用不会受到消光影响的光谱指数来区分包络和磁盘为主的物体。结合文献数据，我们构造了样本中所有对象的光谱能量分布。利用从IRS光谱得出的光谱指数，我们可以推断出磁盘的特性，例如灰尘沉降以及磁盘内部孔和间隙的存在。我们发现过渡磁盘频率大约为3％，该频率基于光谱指数非常大的13-31μm的对象（表明围绕内部磁盘孔的壁），而对于异常大的10μm的对象，频率大约为20％功能，这可能表明磁盘间隙。 10μm硅酸盐排放特征的形状和强度表明，对于质量非常低的物体和褐矮星（光谱类型为M6-M9），较弱的10μm排放和更多处理过的粉尘。这些物体还显示出来自其圆盘的红外过量辐射较弱，但似乎没有比其更高质量的对应物更多的沉降圆盘。我们发现单系统和多系统之间的光谱指数和粉尘特性没有差异。

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