A stringent upper limit of the PH3abundance at the cloud top of Venus

  title={A stringent upper limit of the PH3abundance at the cloud top of Venus},
  author={T. Encrenaz and Thomas K. Greathouse and Emmanuel Marcq and Thomas Widemann and Bruno B'ezard and Thierry Fouchet and Rohini S. Giles and Hideo Sagawa and Jane Greaves and C. Sousa-Silva Lesia and Observatoire de Paris and Psl Universit'e and Cnrs and Sorbonne Universit'e and Universit'e de Paris and SwRI and Latmosipsl and Uvsq Universit'e Paris-Saclay and Kyoto University and School of Cosmic Physics and Astronomy and Cardiff University and Department of Earth and Atmospheric and Planetary Sciences and Massachusetts Institute of Technology},
  journal={arXiv: Earth and Planetary Astrophysics},
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… 

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