Absorption of crystalline water ice in the far infrared at different temperatures
Absorption of crystalline water ice in the far infrared at different temperatures
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不同温度下结晶水冰对远红外的吸收
DOI：
10.1051/0004-6361/201424276
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
P. Mohr
中科院分区：
文献类型：
--
作者：
C. Reinert;H. Mutschke;A. Krivov;T. Löhne;P. Mohr
冰在远红外波段的光学特性对于原行星和碎片盘的模型是很重要的。在本报告中，我们得到了一组新的数据，用于该光谱范围内结晶水冰的吸收（由折射率κ的虚部表示）。这项研究包括对温度依赖性的详细检查，这在以前从未进行过如此详细的检查。我们测量了温度= 10…250时三种不同厚度冰层的透射率波长λ= 80…625μm。在175±6μm波长处，κ的光谱依赖性发生了变化。在较短波长，κ呈现恒定的平坦斜率，没有明显的温度依赖性。在波长较长的地方，斜率变得更陡，并且具有明显的近似线性的温度依赖性。这种行为的变化可能是由水冰的特征吸收带引起的。测量数据用幂律模型拟合，该模型解析地描述了在任意温度下的吸收行为。这个模型可以很容易地应用于任何感兴趣的物体，例如原行星或碎片盘。为了说明该模型是如何工作的，我们模拟了在附近的太阳型恒星HD 207129周围的已分解的大型碎片盘的光谱能量分布（SED）。用另一种常用的水冰数据集代替我们的冰模型，会在更长的波长下得到不同的SED斜率。这导致了盘的特征模型参数的变化，例如推断的粒度分布，并影响了对盘的潜在碰撞物理的解释。
The optical properties of ice in the far infrared are important for models of protoplanetary and debris disks. In this report, we derive a new set of data for the absorption (represented by the imaginary part of the refractive indexκ) of crystalline water ice in this spectral range. The study includes a detailed inspection of the temperature dependence, which has not been conducted in such detail before. We measured the transmission of three ice layers with different thicknesses at temperaturesϑ= 10...250 K and present data at wavelengthsλ= 80...625μm. We found a change in the spectral dependence ofκat a wavelength of 175 ± 6μm. At shorter wavelengths,κexhibits a constant flat slope and no significant temperature dependence. Long-ward of that wavelength, the slope gets steeper and has a clear, approximately linear temperature dependence. This change in behaviour is probably caused by a characteristic absorption band of water ice. The measured data were fitted by a power-law model that analytically describes the absorption behaviour at an arbitrary temperature. This model can readily be applied to any object of interest, for instance a protoplanetary or debris disk. To illustrate how the model works, we simulated the spectral energy distribution (SED) of the resolved, large debris disk around the nearby solar-type star HD 207129. Replacing our ice model by another, commonly used data set for water ice results in a different SED slope at longer wavelengths. This leads to changes in the characteristic model parameters of the disk, such as the inferred particle size distribution, and affects the interpretation of the underlying collisional physics of the disk.
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发表时间：
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DOI：
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发表时间：
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