Author's Reply to Comment by Greaves et al. on “Phosphine in the Venusian Atmosphere: A Strict Upper Limit From SOFIA GREAT Observations”

Author:

Cordiner M. A.12ORCID,Wiesemeyer H.3ORCID,Villanueva G. L.1ORCID,de Pater I.4ORCID,Stutzki J.3,Liuzzi G.5ORCID,Aladro R.3ORCID,Charnley S. B.1,Cosentino R.6,Faggi S.1ORCID,Kofman V.1ORCID,McGuire B. A.7ORCID,Milam S. N.1ORCID,Moullet A.8,Nixon C. A.1ORCID,Thelen A. E.1ORCID

Affiliation:

1. Solar System Exploration Division NASA Goddard Space Flight Center Greenbelt MD USA

2. Department of Physics Catholic University of America Washington DC USA

3. Max Planck Institute for Radio Astronomy Bonn Germany

4. Department of Astronomy University of California Berkeley CA USA

5. School of Engineering Università degli Studi della Basilicata Potenza Italy

6. Space Telescope Science Institute Baltimore MD USA

7. Department of Chemistry Massachusetts Institute of Technology Cambridge MA USA

8. NASA Ames Research Center Moffett Field CA USA

Abstract

AbstractIn an attempt to understand the findings presented in the Comment by Greaves et al. (2023, https://doi.org/10.1029/2023GL103539), we followed their data analysis methodology, omitting the hot and cold‐load calibrations that are an important part of the standard SOFIA GREAT instrument calibration procedure. This process requires scaling of the Venus off‐source spectra by an arbitrary factor, which in turn introduces residuals of the intrinsic receiver bandpass shape as spurious components in the resulting line/continuum spectra. Although these additional artifacts can be reduced via Fourier‐domain spectral filtering, their removal depends on an ill‐constrained interpolation of the Venus continuum across the PH3 spectral line positions, resulting in an unreliable final spectrum. We therefore conclude that the PH3 lines claimed to be detected in the Comment by Greaves et al. (2023, https://doi.org/10.1029/2023GL103539) originate from data/analysis artifacts, and confirm our original result that there is no evidence for phosphine in the SOFIA Venus data.

Funder

Universities Space Research Association

Publisher

American Geophysical Union (AGU)

Subject

General Earth and Planetary Sciences,Geophysics

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