论文标题
金星云顶部的pH $ _3 $丰度的严格上限
A stringent upper limit of the PH$_3$ abundance at the cloud top of Venus
论文作者
论文摘要
在宣布在毫米波长的金星云甲板中宣布检测磷酸（pH $ _3 $）之后，我们在红外范围内搜索了该分子的其他可能签名。 自2012年以来，我们一直在各种波长的热红外观察金星，以监视SO $ _2 $和H $ _2 $ O的行为。我们已经确定了2015年3月记录的光谱间隔，大约在950 cm $^{ - 1} $中，其中有pH $ _3 $过渡。 从没有在此频率下的任何功能的情况下，我们在磁盘集成频谱上得出了3- $σ$的上限为pH $ _3 $混合率为5 ppbv，假定在整个大气中是恒定的。该极限比在毫米波长下得出的磁盘集成混合比低4倍。 我们的结果对云顶部和金星的下层中的最大pH $ _3 $丰度造成了强烈的限制。
Following the announcement of the detection of phosphine (PH$_3$) in the cloud deck of Venus at millimeter wavelengths, we have searched for other possible signatures of this molecule in the infrared range. Since 2012, we have been observing Venus in the thermal infrared at various wavelengths to monitor the behavior of SO$_2$ and H$_2$O at the cloud top. We have identified a spectral interval recorded in March 2015 around 950 cm$^{-1}$ where a PH$_3$ transition is present. From the absence of any feature at this frequency, we derive, on the disk-integrated spectrum, a 3-$σ$ upper limit of 5 ppbv for the PH$_3$ mixing ratio, assumed to be constant throughout the atmosphere. This limit is 4 times lower than the disk-integrated mixing ratio derived at millimeter wavelengths. Our result brings a strong constraint on the maximum PH$_3$ abundance at the cloud top and in the lower mesosphere of Venus.
