Analogues of interplanetary dust particles to interpret the zodiacal light polarization
Analogues of interplanetary dust particles to interpret the zodiacal light polarization
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DOI：
10.1016/j.pss.2018.04.022
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发表时间：
2020-04-01
影响因子：
2.4
通讯作者：
Renard, J-B
中科院分区：
文献类型：
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作者：
Hadamcik, E.;Lasue, J.;Renard, J-B
背景：构成行星际尘埃云的尘埃粒子的一些局部特性可以从它们散射的光中推断出来（重点是它们的线性偏振）。通过数值模拟建议了有机物（吸收颗粒）与硅酸盐（更透明的颗粒）的比例，以再现偏振相位曲线的形状以及偏振随太阳距离减小而减小的情况。目的：在 PROGRA2 光散射实验中，通过对微重力条件下升起的真实尘埃颗粒进行测量，再现这些特性。使用参数与数值模拟得出的参数相似的尘埃类似物。方法：实验中使用了先前针对内部行星际云中两个主要尘埃来源（彗星和小行星）进行过测试的模拟粒子。蓬松聚集体和致密颗粒之间的比例保持恒定。研究了五个样品，对应于数值模拟中定义的有机物/硅酸盐比例的混合物。结果：我们表明，我们可以通过实验模拟再现内部行星际尘埃云中存在的粒子的偏振特性，即它们在距太阳 1.5 个天文单位的对称平面中的偏振相曲线，以及在 90 度相位角处偏振的变化，作为 0.5 个天文单位和 1.5 个天文单位之间太阳距离的函数。不同参数的影响表明，颗粒的尺寸分布遵循幂律，对于 10-100 μm 的尺寸范围，系数为 (-3 +/- 0.5)，对于 100-200 μm 的尺寸范围，系数为 (-4.4 +/- 0.6)，在约 10 μm 处陡峭截止，蓬松聚集体与致密颗粒的质量比恒定为 (35 +/- 10) %，并且递减随着太阳距离的减小，有机物的比例。这些结果是在罗塞塔木星家族彗星任务中彗星尘埃颗粒的最新证据的背景下讨论的。
Context: Some local properties of the dust particles that build the interplanetary dust cloud may be deduced from the light they scatter (with emphasis on their linear polarization). The ratio of organics (absorbing particles) to silicates (more transparent particles) was suggested through numerical simulations to reproduce the shape of the polarimetric phase curve and the decrease in polarization with decreasing solar distance.Aims: Reproducing these properties, through measurements on real dust particles lifted in microgravity conditions, in the PROGRA2 light scattering experiment. Using dust analogues with parameters similar to those derived from numerical simulations.Methods: Analogue particles, previously tested for the two main sources of dust in the inner interplanetary cloud (comets and asteroids) were used in the experiment. The ratio between fluffy aggregates and compact particles was kept constant. Five samples were studied, corresponding to mixtures with the organics / silicates ratio as defined in the numerical simulation.Results: We show that we can reproduce by experimental simulations the polarimetric properties of particles present in the inner interplanetary dust cloud, i.e. their polarimetric phase curve in the symmetry plane at 1.5 au from the Sun and variations of polarization at a 90 degrees phase angle as a function of the solar distance between 0.5 au and 1.5 au. The effect of the different parameters suggests a size distribution of the particles following a power law with coefficients of (-3 +/- 0.5) for a size-range of 10-100 mu m and (-4.4 +/- 0.6) for a size range of 100-200 mu m, with a steep cutoff at about 10 mu m, a constant ratio of (35 +/- 10) % in mass of fluffy aggregates versus compact particles and a decreasing ratio of organics with decreasing solar distance. Such results are discussed in the context of recent evidence on cometary dust particles from the Rosetta mission to a Jupiter family comet.