Composition of organics on asteroid (101955) Bennu

IF 27.8 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

The Astronomy and Astrophysics Review Pub Date : 2021-09-01 DOI:10.1051/0004-6361/202141167

H. Kaplan, Amy Simon, V. Hamilton, M. Thompson, S. Sandford, M. Barucci, E. Cloutis, J. Brucato, D. Reuter, D. Glavin, B. Clark, J. Dworkin, H. Campins, J. Emery, S. Fornasier, X. Zou, D. Lauretta

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引用次数: 9

Abstract

Context. The Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) mission detected an infrared absorption at 3.4 μm on near-Earth asteroid (101955) Bennu. This absorption is indicative of carbon species, including organics, on the surface. Aims. We aim to describe the composition of the organic matter on Bennu by investigating the spectral features in detail. Methods. We use a curated set of spectra acquired by the OSIRIS-REx Visible and InfraRed Spectrometer that have features near 3.4 μm (3.2 to 3.6 μm) attributed to organics. We assess the shapes and strengths of these absorptions in the context of laboratory spectra of extraterrestrial organics and analogs. Results. We find spectral evidence of aromatic and aliphatic CH bonds. The absorptions are broadly consistent in shape and depth with those associated with insoluble organic matter in meteorites. Given the thermal and space weathering environments on Bennu, it is likely that the organics have not been exposed for long enough to substantially decrease the H/C and destroy all aliphatic molecules.

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小行星(101955)Bennu上的有机物组成

上下文。起源，光谱解释，资源识别和安全-风化层探测器(OSIRIS-REx)任务在近地小行星(101955)Bennu上探测到3.4 μm的红外吸收。这种吸收表明了碳的种类，包括表面的有机物。目标我们的目的是通过详细研究光谱特征来描述Bennu上有机物的组成。方法。我们使用了OSIRIS-REx可见光和红外光谱仪获得的一组精选光谱，这些光谱的特征接近3.4 μm(3.2至3.6 μm)，属于有机物。我们在外星有机物和类似物的实验室光谱的背景下评估这些吸收的形状和强度。结果。我们发现了芳香族和脂肪族CH键的光谱证据。这些吸收在形状和深度上与陨石中不溶性有机物的吸收大致一致。考虑到Bennu上的热环境和空间风化环境，有机物很可能暴露的时间还不够长，不足以大幅降低H/C并破坏所有脂肪族分子。

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来源期刊

The Astronomy and Astrophysics Review 地学天文-天文与天体物理

CiteScore

45.00

自引率

0.80%

发文量

期刊介绍： The Astronomy and Astrophysics Review is a journal that covers all areas of astronomy and astrophysics. It includes subjects related to other fields such as laboratory or particle physics, cosmic ray physics, studies in the solar system, astrobiology, instrumentation, and computational and statistical methods with specific astronomical applications. The frequency of review articles depends on the level of activity in different areas. The journal focuses on publishing review articles that are scientifically rigorous and easily comprehensible. These articles serve as a valuable resource for scientists, students, researchers, and lecturers who want to explore new or unfamiliar fields. The journal is abstracted and indexed in various databases including the Astrophysics Data System (ADS), BFI List, CNKI, CNPIEC, Current Contents/Physical, Chemical and Earth Sciences, Dimensions, EBSCO Academic Search, EI Compendex, Japanese Science and Technology, and more.