The recovery of the tentative phosphine signal in the recalibrated ALMA data.

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ALMA telescope dishes

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:

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