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Main Title: Brightness modulations of our nearest terrestrial planet Venus reveal atmospheric super-rotation rather than surface features
Author(s): Lee, Yeon Joo
García Muñoz, Antonio
Imamura, T.
Yamada, M.
Satoh, T.
Yamazaki, A.
Watanabe, S.
Type: Article
Language Code: en
Abstract: Terrestrial exoplanets orbiting within or near their host stars’ habitable zone are potentially apt for life. It has been proposed that time-series measurements of reflected starlight from such planets will reveal their rotational period, main surface features and some atmospheric information. From imagery obtained with the Akatsuki spacecraft, here we show that Venus’ brightness at 283, 365, and 2020 nm is modulated by one or both of two periods of 3.7 and 4.6 days, and typical amplitudes <10% but occasional events of 20–40%. The modulations are unrelated to the solid-body rotation; they are caused by planetary-scale waves superimposed on the super-rotating winds. Here we propose that two modulation periods whose ratio of large-to-small values is not an integer number imply the existence of an atmosphere if detected at an exoplanet, but it remains ambiguous whether the atmosphere is optically thin or thick, as for Earth or Venus respectively. Multi-wavelength and long temporal baseline observations may be required to decide between these scenarios. Ultimately, Venus represents a false positive for interpretations of brightness modulations of terrestrial exoplanets in terms of surface features. Establishing diagnostics for terrestrial exoplanets are crucial for their characterization. Here, the authors show brightness modulations of Venus are caused by planetary-scale waves superimposed on the super-rotating winds can be used to detect existence of an atmosphere if detected at an exoplanet.
Issue Date: 12-Nov-2020
Date Available: 5-Mar-2021
DDC Class: 520 Astronomie und zugeordnete Wissenschaften
Subject(s): astronomy
planetary science
time-series measurements
Sponsor/Funder: TU Berlin, Open-Access-Mittel – 2020
EC/H2020/841432/EU/Cloud Worlds: from Venus to Exoplanet/CLOUDWORLDS
Journal Title: Nature Communications
Publisher: SpringerNature
Publisher Place: London [u.a.]
Volume: 11
Issue: 1
Article Number: 5720
Publisher DOI: 10.1038/s41467-020-19385-6
EISSN: 2041-1723
Appears in Collections:Zentrum für Astronomie und Astrophysik » Publications

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