In September, a team led by astronomers in the United Kingdom that they had detected the chemical phosphine in the thick clouds of Venus. The team鈥檚 reported detection, based on observations by two Earth-based radio telescopes, surprised many Venus experts. Earth鈥檚 atmosphere contains small amounts of phosphine, which may be produced by life. Phosphine on Venus generated buzz that the planet, often succinctly touted as a 鈥�,鈥� could somehow harbor life within its acidic clouds.
Since that initial claim, other science teams have on the reliability of the phosphine detection. Now, a team led by researchers at the 天美影视传媒 has used a robust model of the conditions within the atmosphere of Venus to revisit and comprehensively reinterpret the radio telescope observations underlying the initial phosphine claim. As they report in a accepted to the Astrophysical Journal and posted Jan. 25 to the preprint site arXiv, the U.K.-led group likely wasn鈥檛 detecting phosphine at all.
鈥淚nstead of phosphine in the clouds of Venus, the data are consistent with an alternative hypothesis: They were detecting sulfur dioxide,鈥� said co-author , a UW professor of astronomy. 鈥淪ulfur dioxide is the third-most-common chemical compound in Venus鈥� atmosphere, and it is not considered a sign of life.鈥�
The team behind the new study also includes scientists at NASA鈥檚 Caltech-based Jet Propulsion Laboratory, the NASA Goddard Space Flight Center, the Georgia Institute of Technology, the NASA Ames Research Center and the University of California, Riverside.
The UW-led team shows that sulfur dioxide, at levels plausible for Venus, can not only explain the observations but is also more consistent with what astronomers know of the planet鈥檚 atmosphere and its punishing chemical environment, which includes clouds of sulfuric acid. In addition, the researchers show that the initial signal originated not in the planet鈥檚 cloud layer, but far above it, in an upper layer of Venus鈥� atmosphere where phosphine molecules would be destroyed within seconds. This lends more support to the hypothesis that sulfur dioxide produced the signal.
Both the purported phosphine signal and this new interpretation of the data center on radio astronomy. Every chemical compound absorbs unique wavelengths of the , which includes radio waves, X-rays and visible light. Astronomers use radio waves, light and other emissions from planets to learn about their chemical composition, among other properties.
In 2017 using the , or JCMT, the U.K.-led team discovered a feature in the radio emissions from Venus at 266.94 gigahertz. Both phosphine and sulfur dioxide absorb radio waves near that frequency. To differentiate between the two, in 2019 the same team obtained follow-up observations of Venus using the , or ALMA. Their analysis of ALMA observations at frequencies where only sulfur dioxide absorbs led the team to conclude that sulfur dioxide levels in Venus were too low to account for the signal at 266.94 gigahertz, and that it must instead be coming from phosphine.
In this new study by the UW-led group, the researchers started by modeling conditions within Venus鈥� atmosphere, and using that as a basis to comprehensively interpret the features that were seen 鈥� and not seen 鈥� in the JCMT and ALMA datasets.
鈥淭his is what鈥檚 known as a radiative transfer model, and it incorporates data from several decades鈥� worth of observations of Venus from multiple sources, including observatories here on Earth and spacecraft missions like ,鈥� said lead author Andrew Lincowski, a researcher with the UW Department of Astronomy.
The team used that model to simulate signals from phosphine and sulfur dioxide for different levels of Venus鈥� atmosphere, and how those signals would be picked up by the JCMT and ALMA in their 2017 and 2019 configurations. Based on the shape of the 266.94-gigahertz signal picked up by the JCMT, the absorption was not coming from Venus鈥� cloud layer, the team reports. Instead, most of the observed signal originated some 50 or more miles above the surface, in Venus鈥� mesosphere. At that altitude, harsh chemicals and ultraviolet radiation would shred phosphine molecules within seconds.
鈥淧hosphine in the mesosphere is even more fragile than phosphine in Venus鈥� clouds,鈥� said Meadows. 鈥淚f the JCMT signal were from phosphine in the mesosphere, then to account for the strength of the signal and the compound鈥檚 sub-second lifetime at that altitude, phosphine would have to be delivered to the mesosphere at about 100 times the rate that oxygen is pumped into Earth鈥檚 atmosphere by photosynthesis.鈥�
The researchers also discovered that the ALMA data likely significantly underestimated the amount of sulfur dioxide in Venus鈥� atmosphere, an observation that the U.K.-led team had used to assert that the bulk of the 266.94-gigahertz signal was from phosphine.
鈥淭he antenna configuration of ALMA at the time of the 2019 observations has an undesirable side effect: The signals from gases that can be found nearly everywhere in Venus鈥� atmosphere 鈥� like sulfur dioxide 鈥� give off weaker signals than gases distributed over a smaller scale,鈥� said co-author Alex Akins, a researcher at the Jet Propulsion Laboratory.
This phenomenon, known as spectral line dilution, would not have affected the JCMT observations, leading to an underestimate of how much sulfur dioxide was being seen by JCMT.
鈥淭hey inferred a low detection of sulfur dioxide because of that artificially weak signal from ALMA,鈥� said Lincowski. 鈥淏ut our modeling suggests that the line-diluted ALMA data would have still been consistent with typical or even large amounts of Venus sulfur dioxide, which could fully explain the observed JCMT signal.鈥�
鈥淲hen this new discovery was announced, the reported low sulfur dioxide abundance was at odds with what we already know about Venus and its clouds,鈥� said Meadows. 鈥淥ur new work provides a complete framework that shows how typical amounts of sulfur dioxide in the Venus mesosphere can explain both the signal detections, and non-detections, in the JCMT and ALMA data, without the need for phosphine.鈥�
With science teams around the world following up with fresh observations of Earth鈥檚 cloud-shrouded neighbor, this new study provides an alternative explanation to the claim that something geologically, chemically or biologically must be generating phosphine in the clouds. But though this signal appears to have a more straightforward explanation 鈥� with a toxic atmosphere, bone-crushing pressure and some of our solar system鈥檚 hottest temperatures outside of the sun 鈥� Venus remains a world of mysteries, with much left for us to explore.
Additional co-authors are at the JPL, at UC Riverside, and at the Goddard Space Flight Center, UW researcher , at Georgia Tech and at NASA Ames. The research was funded by the NASA Astrobiology Program and performed at the NExSS Virtual Planetary Laboratory.
For more information, contact Meadows at meadows@uw.edu, Akins at alexander.akins@jpl.nasa.gov and Lincowski at alinc@uw.edu.