HDO and SO2 thermal mapping on Venus: Statistical analysis of the SO2 plumes and comparison with space data

Thérèse Encrenaz (1, 2) , Thomas K. Greathouse (3) , Emmanuel Marcq (4) , Hideo Sagawa (5) , Thomas Widemann (1, 2) , Bruno Bézard (1, 2) , Thierry Fouchet (1, 2) , Sushil K. Atreya (6) , Yeon Joo Lee (7)

1 LESIA (UMR_8109) - Laboratoire d'études spatiales et d'instrumentation en astrophysique
2 Pôle Planétologie du LESIA
3 SwRI - Southwest Research Institute [San Antonio]
4 PLANETO - LATMOS
5 Kyoto University
6 University of Michigan [Ann Arbor]
7 University of Tokyo [Kashiwa Campus]

We have continued our ground-based campaign to monitor HDO and SO2 on Venus in the thermal infrared range, using the TEXES (Texas Echelon Cross Echelle Spectrograph) imaging spectrometer at the IRTF (InfraRed Telescope Facility), at Mauna Kea Observatory. Following the observations described in Encrenaz et al. (A&A, 595, A74, 2016), maps of HDO and SO2 have been recorded on December 16, 22 & 23, 2016 (evening terminator), January 20 & 21, 2017 (evening terminator), and July 12 & 13, 2017 (morning terminator). These data will be discussed and compared with our previous measurements. Using the whole TEXES data set between January 2012 and July 2017, we will present a statistical study of the behavior of the SO2 plumes as a function of date, latitude, longitude and local time. Our results will be compared with the results obtained by Venus Express and Akatsuki.

Domaines: Astrophysique [astro-ph]; Planète et Univers [physics]

Thérèse Encrenaz, Thomas K. Greathouse, Emmanuel Marcq, Hideo Sagawa, Thomas Widemann, et al.. HDO and SO2 thermal mapping on Venus: Statistical analysis of the SO2 plumes and comparison with space data. EGU General Assembly Conference Abstracts, Apr 2018, Vienna, Austria. pp.1865. ⟨hal-03735092⟩