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Greaves, Jane S; Rimmer, Paul B; Richards, Anita M S; Petkowski, Janusz J; Bains, William; Ranjan, Sukrit; Seager, Sara; Clements, David L; Silva, Clara Sousa and Fraser, Helen J
(2022).
DOI: https://doi.org/10.1093/mnras/stac1438
Abstract
New analysis is presented of the 1.1 mm wavelength absorption lines in Venus’ atmosphere that suggested the presence of phosphine. We retrieve a sulphur dioxide observation from the JCMT archive that was simultaneous within a few days of the PH3 1-0 spectrum obtained in June 2017, and demonstrate via a radiative transfer calculation that contamination of PH3 by SO2 was ≈10 per cent. We also present ALMA 2019 spectra of PH3 1-0 and an SO2 transition acquired simultaneously, and infer that SO2 line-contamination was ≲2.5 per cent (for the least-noisy half of the planetary disc). The contamination-subtracted ALMA and JCMT spectra (of 6-8 sigma confidence) are now consistent with similar absorption-depths at the two epochs. The two values span -1.7(±0.5) 10−4 of the continuum signal (which was re-estimated for ALMA), albeit for differing planetary areas. This suggests that the abundance attributed to phosphine in Venus’ atmosphere was broadly similar in 2017 and 2019.
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- Item ORO ID
- 83610
- Item Type
- Journal Item
- ISSN
- 1365-2966
- Keywords
- planets and satellites: individual: Venus, radio lines: planetary systems
- Academic Unit or School
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Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM) - Copyright Holders
- © 2022 The Authors
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