Model of a Kuiper Belt Small Grain Population and Resulting Far-Infrared Emission

Model of a Kuiper Belt Small Grain Population and Resulting Far-Infrared Emission
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柯伊伯带小颗粒群模型及其产生的远红外发射

DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
R. Stencel
R. Stencel
中科院分区：
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文献类型：
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作者：
D. Backman;A. Dasgupta;R. Stencel

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我们已经计算了一个简单的模型，预期柯伊伯带（KB）的小颗粒人口和热辐射，将产生这样的颗粒。我们还寻找了这种发射的观测证据。该模型假设颗粒之间的平衡，碰撞破碎的彗星和删除坡印廷-罗伯逊辐射阻力，辐射压力驱动的喷射，相互碰撞，和升华。模型远红外强度按总KB质量的平方缩放。比较我们的模型与观测的黄道尘埃排除了排放的trans-Neptunian尘埃代表超过约0.3 M的KB彗星。这与最近HST报告的KB中彗星大小的天体的最小质量约为0.04 M的人口一致，尽管该人口可以外推到我们模型的体积中包括多达1 M。KB模型尘埃的分辐射热光度（Ldust/Lstar）分别约为织女星和β Pic周围颗粒盘的10-2和10-4。对COBE DIRBE数据的初步研究表明，在140和240 μm波长处，黄道附近的冷辐射（T = 20-30 K）具有显著的不均匀谱带，但相对于较短波长处的黄道光辐射（IRAS）而言并不显著。这些辐射中的大部分可能不是来自太阳系的物质。
We have calculated a simple model of the expected Kuiper Belt (KB) small grain population and the thermal emission that would arise from such grains. We have also sought observational evidence for this emission. The model assumed equilibrium between grain creation by collisional fragmentation of comets and removal by Poynting-Robertson radiation drag, radiation pressure-driven ejection, mutual collisions, and sublimation. The model far-IR intensity scales as the square of total KB mass. Comparison of our model with observations of the zodiacal dust rules out emission from trans-Neptunian dust representing more than about 0.3 M of KB comets. This agrees with recent HST reports of a population of comet-sized bodies in the KB which has a minimum mass of about 0.04 M, although that population can be extrapolated to include as much as 1 M in the volume of our model. The model KB dust fractional bolometric luminosity (Ldust/Lstar) would have about 10-2 and 10-4 of the values for the grain disks around Vega and β Pic, respectively. A preliminary search in COBE DIRBE data reveals nonuniform bands near the ecliptic of cold (T = 20-30 K) emission prominent at wavelengths of 140 and 240 μm but not prominent relative to zodiacal emission at shorter (IRAS) wavelengths. Most of this emission is probably not from solar system material.