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Reflectivity of Venus’s dayside disk during the 2020 observation campaign: outcomes and future perspectives

Yeon Joo Lee 1, 2 Antonio García Muñoz 3 Atsushi Yamazaki 4, 5 Eric Quémerais 6 Stefano Mottola 1 Stephan Hellmich 1, 7 Thomas Granzer 8 Gilles Bergond 9 Martin Roth 8 Eulalia Gallego-Cano 10 Jean-Yves Chaufray 6 Rozenn Robidel 6 Go Murakami 4 Kei Masunaga 4 Murat Kaplan 11 Orhan Erece 11 Ricardo Hueso 12 Petr Kabáth 13 Magdaléna Špoková 13, 14 Agustín Sánchez-Lavega 12 Myung-Jin Kim 15 Valeria Mangano 16 Kandis-Lea Jessup 17 Thomas Widemann 18 Ko-Ichiro Sugiyama 19 Shigeto Watanabe 20 Manabu Yamada 21 Takehiko Satoh 4 Masato Nakamura 4 Masataka Imai 22 Juan Cabrera 1 
Abstract : We performed a unique Venus observation campaign to measure the disk brightness of Venus over a broad range of wavelengths in 2020 August and September. The primary goal of the campaign was to investigate the absorption properties of the unknown absorber in the clouds. The secondary goal was to extract a disk mean SO$_2$ gas abundance, whose absorption spectral feature is entangled with that of the unknown absorber at ultraviolet wavelengths. A total of three spacecraft and six ground-based telescopes participated in this campaign, covering the 52-1700 nm wavelength range. After careful evaluation of the observational data, we focused on the data sets acquired by four facilities. We accomplished our primary goal by analyzing the reflectivity spectrum of the Venus disk over the 283-800 nm wavelengths. Considerable absorption is present in the 350-450 nm range, for which we retrieved the corresponding optical depth of the unknown absorber. The result shows the consistent wavelength dependence of the relative optical depth with that at low latitudes, during the Venus flyby by MESSENGER in 2007, which was expected because the overall disk reflectivity is dominated by low latitudes. Last, we summarize the experience that we obtained during this first campaign, which should enable us to accomplish our second goal in future campaigns.
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Submitted on : Monday, September 19, 2022 - 9:54:14 PM
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Yeon Joo Lee, Antonio García Muñoz, Atsushi Yamazaki, Eric Quémerais, Stefano Mottola, et al.. Reflectivity of Venus’s dayside disk during the 2020 observation campaign: outcomes and future perspectives. The Planetary Science Journal, IOP Science, 2022, 3, pp.209. ⟨10.3847/psj/ac84d1⟩. ⟨insu-03780953⟩

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