Re-analysis of the 267-GHz ALMA observations of Venus: No statistically significant detection of phosphine release_gcclguaa45btfd363dkxt7dtxe

by I.A.G. Snellen, L. Guzman-Ramirez, M.R. Hogerheijde, A.P.S. Hygate, F.F.S. van der Tak

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abstracts [{'sha1': 'f5fe86d6676b06b9da4a975af5344e546a95323b', 'content': "Context: ALMA observations of Venus at 267 GHz have been presented in the\nliterature that show the apparent presence of phosphine (PH3) in its\natmosphere. Phosphine has currently no evident production routes on the\nplanet's surface or in its atmosphere.\n Aims: The aim of this work is to assess the statistical reliability of the\nline detection by independent re-analysis of the ALMA data.\n Methods: The ALMA data were reduced as in the published study, following the\nprovided scripts. First the spectral analysis presented in the study was\nreproduced and assessed. Subsequently, the spectrum was statistically\nevaluated, including its dependence on selected ALMA baselines.\n Results: We find that the 12th-order polynomial fit to the spectral passband\nutilised in the published study leads to spurious results. Following their\nrecipe, five other >10 sigma lines can be produced in absorption or emission\nwithin 60 km/s from the PH3 1-0 transition frequency by suppressing the\nsurrounding noise. Our independent analysis shows a feature near the PH3\nfrequency at a ~2 sigma level, below the common threshold for statistical\nsignificance. Since the spectral data have a non-Gaussian distribution, we\nconsider a feature at such level as statistically unreliable that cannot be\nlinked to a false positive probability.\n Conclusions: We find that the published 267-GHz ALMA data provide no\nstatistical evidence for phosphine in the atmosphere of Venus.", 'mimetype': 'text/plain', 'lang': 'en'}]
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release_date 2020-10-19
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title Re-analysis of the 267-GHz ALMA observations of Venus: No statistically significant detection of phosphine
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arxiv.base_id 2010.09761
arxiv.categories ['astro-ph.EP']
arxiv.comments Submitted to A&A. No media enquiries