Search Publications
Source of Nitrogen Isotope Anomaly in HCN in the Atmosphere of Titan
Liang, Mao-Chang; Yung, Yuk L.; Heays, Alan N. +2 more
The 14N/15N ratio for N2 in the atmosphere of Titan was recently measured to be a factor of 2 higher than the corresponding ratio for HCN. Using a one-dimensional photochemical model with transport, we incorporate new isotopic photoabsorption and photodissociation cross sections of N2, computed quantum-m…
Photolytically Generated Aerosols in the Mesosphere and Thermosphere of Titan
Shemansky, Donald E.; Liang, Mao-Chang; Yung, Yuk L.
Analysis of the Cassini Ultraviolet Imaging Spectrograph (UVIS) stellar and solar occultations at Titan to date include 12 species: N2 (nitrogen), CH4 (methane), C2H2 (acetylene), C2H4 (ethylene), C2H6 (ethane), C4H2 (diacetylene), C6…
Cassini States with Dissipation: Why Obliquity Tides Cannot Inflate Hot Jupiters
Fabrycky, Daniel C.; Johnson, Eric T.; Goodman, Jeremy
Some short-period exoplanets (``hot Jupiters'') are observed by their transits to have anomalously large radii. It has been suggested that these planets are in a resonance involving persistent misalignment and synchronous precession of their spin and orbital angular momenta (a Cassini state) and that the attendant tidal heating inflates the planet…
Hydrogen Peroxide on Enceladus
Buratti, B. J.; Jaumann, R.; Momary, T. W. +2 more
Scientists have recently discovered a dynamic, geologically active world in Saturn's icy moon, Enceladus. This small satellite has a south polar hot spot at least 70 K hotter than surrounding regions and a plume of water vapor and ice particles surging from the ``tiger stripe'' cracks that flank the pole. Spectral data of the surface of Enceladus …