隼鸟2号#观测到的黄道光日心距离依赖性
Heliocentric Distance Dependence of Zodiacal Light Observed by Hayabusa2#
AI总结：
本文利用隼鸟2号#在0.76-1.06 au范围内的光学观测，首次基于地球轨道外行星际空间黄道光直接测量行星际尘埃径向分布幂律指数，得到α=1.30±0.08，与历史结果一致。
摘要：
黄道光（ZL）是太阳光在光学波段被行星际尘埃粒子（IDPs）散射形成的。太阳系中行星际尘埃粒子的空间分布可能对理解太阳系的演化及其内部物质输运具有重要关键意义。行星际尘埃粒子的数密度可表示为$n(r) \sim r^{-α}$，指数$α\sim 1.3$是由Helios 1/2和Pioneer 10/11在20世纪70年代和80年代从行星际空间进行的先前观测得到的。然而，自那以后，没有基于地球轨道以外行星际空间黄道光观测对$α$进行过直接测量。在此，我们介绍隼鸟2号#任务搭载的ONC-T在2021-2022年间于0.76-1.06 au范围内观测到的光学波段黄道光径向剖面的初步结果。我们获得的黄道光亮度能够被模型亮度很好地再现，尽管在约0.9 au处观测到的黄道光亮度相对于模型亮度存在少量超出。我们得到的径向幂律指数为$α= 1.30 \pm 0.08$，这与先前基于黄道光观测的结果一致。不确定性的主要来源是估计弥漫银河光（DGL）时的不确定性。
英文摘要：
Zodiacal light (ZL) is sunlight scattered by interplanetary dust particles (IDPs) at optical wavelengths. The spatial distribution of IDPs in the Solar System may hold an important key to understanding the evolution of the Solar System and material transportation within it. The number density of IDPs can be expressed as $n(r) \sim r^{-α}$, and the exponent $α\sim 1.3$ was obtained by previous observations from interplanetary space by Helios 1/2 and Pioneer 10/11 in the 1970s and 1980s. However, no direct measurements of $α$ based on ZL observations from interplanetary space outside Earth's orbit have been performed since then. Here, we introduce initial results for the radial profile of the ZL at optical wavelengths observed over the range 0.76-1.06 au by ONC-T aboard the Hayabusa2# mission in 2021-2022. The ZL brightness we obtained is well reproduced by a model brightness, although there is a small excess of the observed ZL brightness over the model brightness at around 0.9 au. The radial power-law index we obtained is $α= 1.30 \pm 0.08$, which is consistent with previous results based on ZL observations. The dominant source of uncertainty arises from the uncertainty in estimating the diffuse Galactic light (DGL).
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