利用CLASS对金星进行的微波观测
Microwave Observations of Venus with CLASS
AI总结：
本研究利用CLASS在四个微波频段测得金星盘面平均绝对亮温，未发现亮温与太阳光照相关，联合VLA低频观测分析发现金星大气均温比此前无线电掩星结果高约7 K、微波连续谱吸收体丰度更低。
摘要：
我们报告了借助宇宙学大角尺度测量仪（Cosmology Large Angular Scale Surveyor，CLASS）在四个微波频段测得的金星盘面平均绝对亮温。我们测得中心频率分别为38.8、93.7、147.9和217.5 GHz的频段对应的温度为432.3±2.8 K、355.6±1.3 K、317.9±1.7 K和294.7±1.9 K。在所有四个频段中，我们均未观测到测得的亮温与太阳光照存在任何关联。将我们的测量结果与更低频率的甚大阵（Very Large Array，VLA）观测结果联合分析表明，相较于此前通过无线电掩星测量推断的结果，金星平均大气温度相对更高（高约7 K），且微波连续谱吸收体的丰度更低。
英文摘要：
We report on the disk-averaged absolute brightness temperatures of Venus measured at four microwave frequency bands with the Cosmology Large Angular Scale Surveyor (CLASS). We measure temperatures of 432.3 $\pm$ 2.8 K, 355.6 $\pm$ 1.3 K, 317.9 $\pm$ 1.7 K, and 294.7 $\pm$ 1.9 K for frequency bands centered at 38.8, 93.7, 147.9, and 217.5 GHz, respectively. We do not observe any dependence of the measured brightness temperatures on solar illumination for all four frequency bands. A joint analysis of our measurements with lower frequency Very Large Array (VLA) observations suggests relatively warmer ($\sim$ 7 K higher) mean atmospheric temperatures and lower abundances of microwave continuum absorbers than those inferred from prior radio occultation measurements.
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