Mid-infrared Measurements of Ion-irradiated Carbonaceous Meteorites: How to Better Detect Space Weathering Effects

IF 3.8 Q2 ASTRONOMY & ASTROPHYSICS The Planetary Science Journal Pub Date : 2024-09-16 DOI:10.3847/psj/ad5d6f
C. Lantz, T. Nakamura, D. Baklouti, R. Brunetto, E. Henault, S. Kobayashi, O. Mivumbi, Z. Djouadi, E. Quirico, M. Zolensky and T. Hiroi
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Abstract

Remote sensing study of asteroids will soon enter a new era with an increasing amount of data available thanks to the JWST, especially in the mid-infrared (MIR) range that allows identification of mineral species. It will then be possible to establish a taxonomy, as is currently available in the visible–near-infrared range, based on MIR spectral parameters. It had been previously shown that the MIR range is very sensitive to space weathering (SpWe) effects. Thus, it is crucial to determine which spectral changes are involved to disentangle initial composition from surface aging and provide tools to interpret future remote sensing data of asteroids. We present here MIR measurements of a wide variety of ion-irradiated carbonaceous chondrites as a simulation of the solar wind SpWe component. We evaluate several parameters (the Christiansen feature and Reststrahlen band positions, the width of the main Si–O band) and test different measurement conditions (ion energy and geometry of observation). We highlight a dependency of the spectral changes with the initial composition, as hydrated samples are more affected than anhydrous ones. We confirm the role of the geometry in the detection of SpWe effects as already shown in the near-infrared, with a competition effect between the depth probed by photons and the implantation depth of ions (function of the energy used). We will discuss the results in the framework of future observations and Ryugu’s and Bennu’s samples studied in the laboratory.
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离子辐照碳质陨石的中红外测量:如何更好地探测空间风化效应
对小行星的遥感研究很快将进入一个新时代,由于 JWST 的出现,可获得的数据量不断增加,特别是在中红外(MIR)范围内,可以识别矿物种类。届时将有可能根据中红外光谱参数建立分类法,就像目前在可见光-近红外范围内的分类法一样。以前的研究表明,中红外光谱范围对空间风化(SpWe)效应非常敏感。因此,确定涉及哪些光谱变化至关重要,这样才能将初始成分与表面老化区分开来,并为解读未来的小行星遥感数据提供工具。我们在此介绍对各种离子辐照碳质软玉的近红外测量结果,作为太阳风 SpWe 部分的模拟。我们评估了几个参数(Christiansen 特征和 Reststrahlen 波段位置、Si-O 主波段宽度),并测试了不同的测量条件(离子能量和观测几何形状)。我们强调了光谱变化与初始成分的关系,因为水合样品比无水样品受到的影响更大。我们证实了几何形状在检测 SpWe 效应中的作用,正如在近红外光谱中已经显示的那样,光子探测的深度与离子植入深度之间存在竞争效应(所用能量的函数)。我们将在未来的观测框架内讨论这些结果,以及在实验室中研究的龙宫和贝努样本。
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来源期刊
The Planetary Science Journal
The Planetary Science Journal Earth and Planetary Sciences-Geophysics
CiteScore
5.20
自引率
0.00%
发文量
249
审稿时长
15 weeks
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