近地天体的水合特征：整合新数据与先前结果
Hydration Features on Near-Earth Objects: Integrating New Data with Prior Results
AI总结：
研究通过整合新数据与先前结果，发现低倾角和大离心率的近地天体可能具有表面OH/H2O。
摘要：
近地天体（NEOs）是测试影响无大气天体过程的绝佳实验室，也为我们了解太阳系历史提供了信息。尽管大多数NEOs本质上是无水的，因为它们在太阳系霜线以内形成，且其表面温度高到足以去除挥发性物质，但几个这样的天体上却检测到了3微米特征，通常指示OH/H2O的存在。可能的OH/H2O来源包括碳质球粒陨石撞击物或与太阳风中植入的质子相互作用。麻省理工学院-夏威夷近地天体光谱调查（MITHNEOS）于2022年开始对NEOs进行3微米观测活动，并利用NASA的红外望远镜设施（IRTF）的近红外光谱仪SpeX，获得了15个主要为本质上无水（即大部分为S-复杂或V型）目标的光谱数据。使用棱镜（0.7-2.52微米）和LXD_short（1.67-4.2微米）模式收集光谱，以准确表征小行星光谱类型和3微米区域。四个观察到的15个NEOs中，有四个显示出3微米特征，其带形与之前NEOs调查中识别的类似（McGraw等，2022年），该调查发现水合带存在与大离心率（即Q>2.06 AU）之间存在趋势。结合我们的新观测与先前NEOs 2-4微米数据数据库，发现带深增加随着轨道倾角减小，且所有具有水合带的NEOs都有i<27度，大多数有i<14度。我们发现倾角低且大离心率的NEOs是最可能在近地空间拥有表面OH/H2O的天体。
英文摘要：
Near-Earth objects (NEOs) are excellent laboratories for testing processes that affect airless bodies, as well as informing us about Solar System history. Though most NEOs are nominally anhydrous because they formed inside the Solar System frost line and their surface temperatures are high enough to remove volatiles, a 3-micron feature typically indicative of OH/H2O has been identified on several such bodies. Possible sources for OH/H2O on these bodies include carbonaceous chondrite impactors or interactions with protons implanted by solar wind. The MIT-Hawaii Near-Earth Object Spectroscopic Survey (MITHNEOS) began its 3-micron observation campaign of NEOs in 2022 and has obtained spectral data of 15 predominantly nominally anhydrous (i.e., mostly S-complex or V-type) targets using NASA's Infrared Telescope Facility's (IRTF) near-infrared spectrometer, SpeX. Spectra were collected using both prism (0.7-2.52 micron) and LXD_short (1.67-4.2 micron) modes to accurately characterize asteroid spectral type and the 3-micron region. Four of the 15 NEOs observed exhibit a 3-micron feature, exhibiting band shapes similar to those identified in a previous NEO survey (McGraw et al. 2022), which found a trend between hydration band presence and large aphelion (i.e., Q > 2.06 AU). Combining our new observations with the pre-existing database of NEO 2-4-micron data revealed that band depth increases with decreasing orbital inclination and that all NEOs with hydration bands have i < 27 degrees with most having i < 14 degrees. We find that NEOs with low inclination and large aphelia are the most likely bodies in near-Earth space to possess surficial OH/H2O.
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