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The enigmatic abundance of atomic hydrogen in Saturn's upper atmosphere
Lotfi Ben-Jaffel, Julie Moses, Robert A. West +5
A planet's Lyman-α (Lyα) emission is sensitive to its thermospheric structure. Here, we report joint Hubble Space Telescope (HST) and Cassini cross-calibration observations of the…
Saturn's atmospheric response to the large influx of ring material inferred from Cassini INMS measurements
Julianne I. Moses, Zarah L. Brown, Tommi T. Koskinen +12
During the Grand Finale stage of the Cassini mission, organic-rich ring material was discovered to be flowing into Saturn's equatorial upper atmosphere at a surprisingly large rate…
Signatures of Strong Magnetization and Metal-Poor Atmosphere for a Neptune-Size Exoplanet
Lotfi Ben-Jaffel, Gilda E. Ballester, Antonio García Muñoz +10
The magnetosphere of an exoplanet has yet to be unambiguously detected. Investigations of star-planet interaction and neutral atomic hydrogen absorption during transit to detect ma…
The Hubble PanCET program: An extensive search for metallic ions in the exosphere of GJ 436 b
L. A. dos Santos, D. Ehrenreich, V. Bourrier +15
(Abridged) The quiet M2.5 star GJ 436 hosts a warm Neptune that displays an extended atmosphere that dwarfs its own host star. Predictions of atmospheric escape in such planets sta…
The HST PanCET Program: Exospheric Mg II and Fe II in the Near-UV transmission spectrum of WASP-121b using Jitter Decorrelation
David K. Sing, Panayotis Lavvas, Gilda E. Ballester +17
We present HST near-ultraviolet (NUV) transits of the hot Jupiter WASP-121b, acquired as part of the PanCET program. Time series spectra during two transit events were used to meas…
An optical transmission spectrum for the ultra-hot Jupiter WASP-121b measured with the Hubble Space Telescope
Thomas M. Evans, David K. Sing, Jayesh Goyal +24
We present an atmospheric transmission spectrum for the ultra-hot Jupiter WASP-121b, measured using the Space Telescope Imaging Spectrograph (STIS) onboard the Hubble Space Telesco…