Hydrogen abundance estimation and distribution on (101955) Bennu
Hydrogen abundance estimation and distribution on (101955) Bennu
复制标题
(101955) Bennu 上的氢丰度估计和分布
DOI：
10.1016/j.icarus.2021.114427
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发表时间：
2021
期刊：
影响因子：
3.2
通讯作者：
D. Lauretta
中科院分区：
文献类型：
--
作者：
A. Praet;M. Barucci;B. Clark;H. Kaplan;A. Simon;V. Hamilton;J. Emery;E. Howell;L. Lim;X. Zou;Jian;D. Reuter;F. Merlin;J. Deshapriya;S. Fornasier;P. Hasselmann;G. Poggiali;S. Ferrone;J. Brucato;D. Takir;E. Cloutis;H. Connolly;M. Fulchignoni;D. Lauretta
小行星可能是早期地球挥发物和水的主要来源。量化小行星的水合作用对于限制太阳系的形成和演化以及地球生命起源的模型是必要的。 OSIRIS-REx（起源、光谱解释、资源识别和安全 - 风化层探索者）任务表明，近地小行星 (101955) Bennu 含有广泛、丰富的水合层状硅酸盐，在 ~ 2.7 μm 处存在普遍吸收表明。这项工作的目的是量化贝努表面页硅酸盐的水合作用（即氢含量），并研究这种水合作用如何在空间上变化。我们分析了光谱参数（归一化光程长度，NOPL；有效单散射反照率，ESPAT；和高斯模型），这些参数是根据 OVIRS（OSIRIS-REx 可见光和红外光谱仪）获得的空间分辨可见-近红外光谱的水合页硅酸盐吸收带计算得出的。我们还使用实验室测量的陨石光谱（包括 CM、CI 和未分组的 C2 塔吉什湖）计算了相同的光谱参数。我们估计 Bennu 表面水合页硅酸盐中水和羟基的平均氢含量为 0.71 ± 0.16 wt%。该值与一些水蚀变陨石（CM，C2 塔吉什湖）的水合范围一致，但与水蚀变最大的陨石组（CI）不同。 OSIRIS-REx 任务的样本采集点的氢含量略高于平均水平。贝努表面氢含量的空间变化与地貌有关，并且可能部分遗传自其母体。
Asteroids were likely a major source of volatiles and water to early Earth. Quantifying the hydration of asteroids is necessary to constrain models of the formation and evolution of the Solar System and the origin of Life on Earth. The OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer) mission showed that near-Earth asteroid (101955) Bennu contains widespread, abundant hydrated phyllosilicates, indicated by a ubiquitous absorption at ~ 2.7 μm. The objective of this work is to quantify the hydration—that is, the hydrogen content—of phyllosilicates on Bennu's surface and investigate how this hydration varies spatially. We analyse spectral parameters (normalized optical path length, NOPL; effective single-scattering albedo, ESPAT; and Gaussian modeling) computed from the hydrated phyllosilicate absorption band of spatially resolved visible–near-infrared spectra acquired by OVIRS (the OSIRIS-REx Visible and InfraRed Spectrometer). We also computed the same spectral parameters using laboratory-measured spectra of meteorites including CMs, CIs, and the ungrouped C2 Tagish Lake. We estimate the mean hydrogen content of water and hydroxyl groups in hydrated phyllosilicates on Bennu's surface to be 0.71 ± 0.16 wt%. This value is consistent with the hydration range of some aqueously altered meteorites (CMs, C2 Tagish Lake), but not the most aqueously altered group (CIs). The sample collection site of the OSIRIS-REx mission has slightly higher hydrogen content than average. Spatial variations in hydrogen content on Bennu's surface are linked to geomorphology, and may have been partially inherited from its parent body.
大象冰碛 96029，一种非常轻微的水蚀和加热的 CM 碳质球粒陨石：对母体加工驱动因素的影响
影响因子：
5
作者：
Lee M
通讯作者：
Lee M
影响因子：
5
作者：
Beck, P.;Quirico, E.;Guillot, S.
通讯作者：
Guillot, S.