论文标题
大型彗星灰尘颗粒的散射，吸收和热发射：概要数值溶液
Scattering, absorption, and thermal emission by large cometary dust particles: Synoptic numerical solution
论文作者
论文摘要
上下文：遥远散射和热红外观测提供了有关彗星和星际尘埃颗粒的物理特性的线索。确定这些属性将使人们更好地理解太阳系的形成和演变。目的：我们提出了一种数值解，用于在由任意形状的表面包围的随机颗粒培养基中的辐射和导电热传输。该方法将应用于研究彗星粉尘颗粒的热性能。方法：最近引入的不一致的蒙特卡洛辐射转移方法开发了用于散射，吸收和繁殖电磁波在密集离散的随机介质中的散射，吸收和传播，用于辐射热传递和热发射。该溶液与有限元方法求解的导电傅立叶传输方程相结合。结果：所提出的方法允许通过由亚微米大小的晶粒组成的大型彗星粉尘颗粒对光散射和热发射的概要分析。特别是，我们表明这些颗粒可以维持明显的温度梯度，从而导致观察到67p/churyumov-gerasimenko昏迷的过热因子相功能。
Context: Remote light scattering and thermal infrared observations provide clues about the physical properties of cometary and interplanetary dust particles. Identifying these properties will lead to a better understanding of the formation and evolution of the Solar System. Aims: We present a numerical solution for the radiative and conductive heat transport in a random particulate medium enclosed by an arbitrarily shaped surface. The method will be applied to study thermal properties of cometary dust particles. Methods: The recently introduced incoherent Monte Carlo radiative transfer method developed for scattering, absorption, and propagation of electromagnetic waves in dense discrete random media is extended for radiative heat transfer and thermal emission. The solution is coupled with the conductive Fourier transport equation that is solved with the finite-element method. Results: The proposed method allows the synoptic analysis of light scattering and thermal emission by large cometary dust particles consisting of submicrometer-sized grains. In particular, we show that these particles can sustain significant temperature gradients resulting in the superheating factor phase function observed for the coma of comet 67P/Churyumov-Gerasimenko.
