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Water Ortho-to-Para ratio in the coma of comet 67P/Churyumov-Gerasimenko
Y. -C. Cheng, D. Bockelée-Morvan, M. Roos-Serote +9
Abundance ratios of the nuclear-spin isomers of HO and NH have been measured in about two dozen comets, with a mean value corresponding to a nuclear-spin temperature of $\s…
Investigation of UV absorbers on Venus using the 283 and 365 nm phase curves obtained from Akatsuki
Y. J. Lee, A. García Muñoz, A. Yamazaki +3
The so-called unknown absorber in the clouds of Venus is an important absorber of solar energy, but its vertical distribution remains poorly quantified. We analyze the 283 and 365-…
A stringent upper limit of the PH abundance at the cloud top of Venus
T. Encrenaz, T. K. Greathouse, E. Marcq +7
Following the announcement of the detection of phosphine (PH) in the cloud deck of Venus at millimeter wavelengths, we have searched for other possible signatures of this molec…
Analysis of HST, VLT and Gemini coordinated observations of Uranus late 2017 : a multi-spectral search for auroral signatures
L. Lamy, C. Berland, N. Andre +7
On 6 Sept. 2017, an exceptional coronal mass ejection departed from the Sun toward the Earth and Uranus, whose magnetospheres are sensitive to the solar wind. The resulting interpl…
Evolution of CO, CH, and OCS abundances relative to HO in the coma of comet 67P around perihelion from Rosetta/VIRTIS-H observations
D. Bockelée-Morvan, J. Crovisier, S. Erard +19
Infrared observations of the coma of 67P/Churyumov-Gerasimenko were carried out from July to September 2015, i.e., around perihelion (13 August 2015), with the high-resolution chan…