A NEAR-INFRARED SEARCH FOR SILICATES IN JOVIAN TROJAN ASTEROIDS
A NEAR-INFRARED SEARCH FOR SILICATES IN JOVIAN TROJAN ASTEROIDS
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近红外搜索木星特洛伊小行星中的硅酸盐
DOI：
10.1088/0004-6256/141/3/95
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
D. Jewitt
中科院分区：
文献类型：
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作者：
Bin Yang;D. Jewitt
我们获得了7颗木星特洛伊小行星的近红外（NIR; 0.8-2.5 μm）光谱，这些小行星在1 μm附近具有类似硅酸盐的吸收特征。我们的样本包括Trojan（1172）Aneas，它是已知拥有彗星般10 μm发射特征的三个Trojan之一，指示细粒硅酸盐。我们的观察结果表明，所有七个木马出现在高信噪比频谱的特征。如果（1172）Aneas上的硅酸盐是贫铁的，那么可以理解1 μm波段的缺失和10 μm发射的存在。此外，我们提出了五个光学灰色特洛伊，包括三个对象碰撞产生的Eurybates家庭的近红外观测。这五个灰色特洛伊木马在NIR中看起来没有特征，没有诊断吸收特征。Eurybates的近红外光谱与CM 2碳质球粒陨石的光谱最吻合，这表明C型Eurybates家族成员可能经历了水蚀变。
We obtained near-infrared (NIR; 0.8–2.5 μm) spectra of seven Jovian Trojan asteroids that have been formerly reported to show silicate-like absorption features near 1 μm. Our sample includes the Trojan (1172) Aneas, which is one of the three Trojans known to possess a comet-like 10 μm emission feature, indicative of fine-grained silicates. Our observations show that all seven Trojans appear featureless in high signal-to-noise ratio spectra. The simultaneous absence of the 1 μm band and the presence of the 10 μm emission can be understood if the silicates on (1172) Aneas are iron-poor. In addition, we present NIR observations of five optically gray Trojans, including three objects from the collisionally produced Eurybates family. The five gray Trojans appear featureless in the NIR with no diagnostic absorption features. The NIR spectrum of Eurybates can be best fitted with the spectrum of a CM2 carbonaceous chondrite, which hints that the C-type Eurybates family members may have experienced aqueous alteration.