The Venus Phosphine team reanalyzed the data in search for the phosphine signal in the newly recalibrated ALMA data and recovered a tentative PH3 signal in Venus’ atmosphere (~5 sigma confidence). A planet-averaged phosphine abundance is 1-4 ppb, lower than from the earlier ALMA processing (which indicated ~7 ppb). Localized abundance of phosphine appears to peak at ~5-10 ppb, with suggestions of spatial variation. The ALMA data are reconcilable with the JCMT detection (~20 ppb) if there is order-of-magnitude temporal variation; more advanced processing of the JCMT data is underway to check methods.
For more information go to the paper here: https://www.essoar.org/doi/10.1002/essoar.10504552.1