Search Publications
Saturn's Atmosphere in Northern Summer Revealed by JWST/MIRI
Fletcher, Leigh N.; Hedman, Matthew M.; Guerlet, Sandrine +8 more
Saturn's northern summertime hemisphere was mapped by JWST/Mid-Infrared Instrument (4.9-27.9 µm) in November 2022, tracing the seasonal evolution of temperatures, aerosols, and chemical species in the 5 years since the end of the Cassini mission. The spectral region between reflected sunlight and thermal emission (5.1-6.8 µm) is mapped for the fir…
The Temporal Brightening of Uranus' Northern Polar Hood From HST/WFC3 and HST/STIS Observations
Wong, Michael H.; Fletcher, Leigh N.; Irwin, Patrick G. J. +8 more
Hubble Space Telescope Wide-Field Camera 3 (HST/WFC3) observations spanning 2015 to 2021 confirm a brightening of Uranus' north polar hood feature with time. The vertical aerosol model of Irwin et al. (2023, https://doi.org/10.1038/s41550-023-02047-0) (IRW23), consisting of a deep haze layer…
Evidence of Non-Thermal Hydrogen in the Exosphere of Mars Resulting in Enhanced Water Loss
Bertaux, J. L.; Clarke, J. T.; Halekas, J. +9 more
Atomic H is a direct tracer of water loss at Mars. The recent discovery of annual enhancements in its escape rate near perihelion, in excess of the previously established theory, indicates that Mars has lost substantial amounts of water to space. However, these loss rates are often estimated assuming thermal properties for the exospheric H atoms a…
Temporal Variations in Vertical Cloud Structure of Jupiter's Great Red Spot, Its Surroundings and Oval BA From HST/WFC3 Imaging
Irwin, Patrick G. J.; Sánchez-Lavega, Agustín.; Anguiano-Arteaga, Asier +2 more
In this study, we present the evolution of the properties and vertical distribution of the hazes in Jupiter's Great Red Spot (GRS), its surroundings and Oval BA from 2015 to 2021. To retrieve the main atmospheric parameters, we model the spectral reflectivity of a number of dynamically and/or spectrally interesting regions with a radiative transfe…
Ultraviolet and Visible Reflectance Spectra of Phobos and Deimos as Measured by the ExoMars-TGO/NOMAD-UVIS Spectrometer
Vandaele, A. C.; Daerden, F.; Thomas, I. R. +18 more
Spectroscopic measurements are a powerful tool to investigate the surface composition of airless bodies and provide clues of their origin. The composition and origin of Phobos and Deimos are still unknown and are currently widely debated. We present spectroscopic measurements of Phobos and Deimos at ultraviolet and visible wavelengths (250-650 nm)…