Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 49, Issue 22, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL101055
Keywords
Venus; atmosphere; phosphine; submillimeter; spectroscopy; far-infrared
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Funding
- NASA [NNA17BF53C, 075_0059]
- Deutsches SOFIA Institut (DSI) under DLR contract [50 OK 2002]
- NASA Planetary Science Division Internal Scientist Funding Program through the Fundamental Laboratory Research work package (FLaRe)
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No evidence of atmospheric phosphine (PH3) was detected in the search for PH3 on Venus using the German REceiver for Astronomy at Terahertz Frequencies instrument.
The presence of phosphine (PH3) in the atmosphere of Venus was reported by Greaves et al. (2021, ), based on observations of the J = 1-0 transition at 267 GHz using ground-based, millimeter-wave spectroscopy. This unexpected discovery presents a challenge for our understanding of Venus's atmosphere, and has led to a reappraisal of the possible sources and sinks of atmospheric phosphorous-bearing gases. Here we present results from a search for PH3 on Venus using the German REceiver for Astronomy at Terahertz Frequencies instrument aboard the Stratospheric Observatory for Infrared Astronomy aircraft, over three flights conducted in November 2021. Multiple PH3 transitions were targeted at frequencies centered on 533 and 1,067 GHz, but no evidence for atmospheric PH3 was detected. Through radiative transfer modeling, we derived a disk-averaged upper limit on the PH3 abundance of 0.8 ppb in the altitude range 75-110 km, which is more stringent than previous ground-based studies.
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