サガワ ヒデオ   SAGAWA HIDEO
  佐川 英夫
   所属   京都産業大学  理学部 宇宙物理・気象学科
   職種   教授
発行・発表の年月 2020/11
形態種別 研究論文
査読 査読あり
標題 A stringent upper limit of the PH3abundance at the cloud top of Venus
執筆形態 その他
掲載誌名 Astronomy & Astrophysics
出版社・発行元 EDP Sciences
巻・号・頁 643,L5-L5頁
著者・共著者 T. Encrenaz,T. K. Greathouse,E. Marcq,T. Widemann,B. Bézard,T. Fouchet,R. Giles,H. Sagawa,J. Greaves,C. Sousa-Silva
概要 Aims.Following the announcement of the detection of phosphine (PH3) in the cloud deck of Venus at millimeter wavelengths, we searched for other possible signatures of this molecule in the infrared range.

Methods.Since 2012, we have been observing Venus in the thermal infrared at various wavelengths to monitor the behavior of SO2and H2O at the cloud top. We identified a spectral interval recorded in March 2015 around 950 cm−1where a PH3transition is present.

Results.From the absence of any feature at this frequency, we derive, on the disk-integrated spectrum, a 3-σupper limit of 5 ppbv for the PH3mixing ratio, which is assumed to be constant throughout the atmosphere. This limit is four times lower than the disk-integrated mixing ratio derived at millimeter wavelengths.

Conclusions.Our result places a strong constraint on the maximum PH3abundance at the cloud top and in the lower mesosphere of Venus.
DOI 10.1051/0004-6361/202039559
ISSN 0004-6361/1432-0746
PermalinkURL https://www.aanda.org/10.1051/0004-6361/202039559/pdf