金星云顶次要物种的严格上限:PH3、HCN 和 NH3

IF 5.4 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
T. Encrenaz, T. K. Greathouse, R. Giles, T. Widemann, B. Bézard, F. Lefèvre, M. Lefèvre, W. Shao, H. Sagawa, E. Marcq, A. Arredondo
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引用次数: 0

摘要

目的。继几份报告宣布在金星云层上方检测到或未检测到次要物种之后,我们在红外范围内寻找PH3、HCN和NH3的其他可能特征。自2012年以来,我们对金星进行了不同波长的热红外地基观测,以监测云顶SO2和H2O的行为。我们确定了存在PH3(约955 cm-1)、HCN(约747 cm-1)和NH3(约951 cm-1)跃迁的光谱区间。由于在这些频率上没有任何特征,我们根据圆盘积分光谱得出 PH3 混合比的 3-σ 上限为 3 ppbv,HCN 为 0.5 ppbv,NH3 为 0.3 ppbv,假定这些物种在整个大气中的混合比不变。在测线中心位置记录的金星圆盘图显示,没有证据表明在金星圆盘的任何地方进行了局部探测。我们的研究结果为金星云顶和低层中间层这些物种的最大丰度提供了新的约束条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stringent upper limits of minor species at the cloud top of Venus: PH3, HCN, and NH3
Aims. Following several reports announcing the detection or non-detection of minor species above the clouds of Venus, we have searched for other possible signatures of PH3, HCN, and NH3 in the infrared range.Methods. Since 2012, we have performed ground-based observations of Venus in the thermal infrared at various wavelengths to monitor the behavior of SO2 and H2O at the cloud top. We have identified spectral intervals where transitions of PH3 (around 955 cm−1), HCN (around 747 cm−1), and NH3 (around 951cm−1) are present.Results. From the absence of any feature at these frequencies, we derive, on the disk-integrated spectrum, a 3-σ upper limit of 3 ppbv for the PH3 mixing ratio, 0.5 ppbv for HCN, and 0.3 ppbv for NH3, assuming that these species have a constant mixing ratio throughout the atmosphere. Maps of the Venus disk recorded at the center position of the lines show that there is no evidence for local detection anywhere over the Venus disk.Conclusions. Our results bring new constraints on the maximum abundance of these species at the cloud top and in the lower mesosphere of Venus.
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来源期刊
Astronomy & Astrophysics
Astronomy & Astrophysics 地学天文-天文与天体物理
CiteScore
10.20
自引率
27.70%
发文量
2105
审稿时长
1-2 weeks
期刊介绍: Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.
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