Spectrophotometry of the Jovian Planets and Titan at 300- to 1000-nm Wavelength: The Methane Spectrum
Spectrophotometry of the Jovian Planets and Titan at 300- to 1000-nm Wavelength: The Methane Spectrum
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木星行星和泰坦在 300 至 1000 nm 波长下的分光光度测定：甲烷光谱
DOI：
10.1006/icar.1994.1139
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发表时间：
1994
期刊：
影响因子：
3.2
通讯作者：
E. Karkoschka
中科院分区：
文献类型：
--
作者：
E. Karkoschka
摘要根据1993年7月欧洲南方天文台的观测资料，导出了类木行星和土卫六的全圆盘光谱。光谱范围从300 nm到1000 nm，分辨率为1 nm。在可见光范围内，信噪比约为1000。相对误差为2%，绝对误差为4%。还确定了颜色和大小。在每个类木行星的光谱中，大约有40-60个拉曼散射特征可见。一个拉曼散射模型与五个参数调整每个行星可以解释这些功能。给出了甲烷的吸收光谱，它符合类木行星和土卫六光谱中甲烷的特征。它不同于室温实验室光谱，但它与低温下的一些有限的实验室数据一致。在天王星和海王星的光谱中发现了三个新的弱甲烷带。木星光谱中的强吸收手可能是由于水，证实了木星大气中探测部分的氧气强烈耗尽。
Abstract Full-disk albedo spectra of the jovian planets and Titan were derived from observations at the European Southern Observatory in July 1993. The spectra extend from 300- to 1000-nm wavelength at 1-nm resolution. The signal-to-noise ratio is approximately 1000 in the visible. The accuracy is 2% for relative and 4% for absolute ulbedos. Colors and magnitudes were also determined. Some 40-60 Raman scattering features are visible in the spectrum of each jovian planet. A Raman scattering model with five parameters adjusted for each planet can explain these features. A methane absorption spectrum is given which fits methane features in the spectra of the jovian planets and Titan. It differs from room-temperature laboratory spectra but it is consistent with some limited laboratory data at cold temperatures. Three new, weak methane bands were detected in the spectra of Uranus and Neptune. A strong absorption hand in Jupiter's spectrum is possibly due to water, confirming a strong depletion of oxygen in the probed part of Jupiter's atmosphere.