Results 21 to 30 of about 141,901 (265)

Wind‐induced atmospheric escape: Titan [PDF]

Geophysical Research Letters, 2012
Rapid thermospheric flows can significantly enhance the atmospheric loss rates and structures of atmospheric coronae of planetary bodies. Using descriptions of atmospheric escape based on molecular kinetic models, we show that such flows at the exobase of Titan could significantly increase the calculated constituent thermal and nonthermal escape rates.
R. E. Hartle, R. E. Johnson, E. C. Sittler, M. Sarantos, D. G. Simpson   +4 more
openaire   +1 more source

Observing Atmospheric Escape in Sub-Jovian Worlds with JWST

The Astronomical Journal, 2023
Hydrodynamic atmospheric escape is considered an important process that shapes the evolution of sub-Jovian exoplanets, particularly those with short orbital periods.
Leonardo A. Dos Santos, Munazza K. Alam, Néstor Espinoza, Shreyas Vissapragada   +3 more
doaj   +1 more source

Developing a self‐consistent description of Titan's upper atmosphere without hydrodynamic escape [PDF]

, 2014
In this study, we develop a best fit description of Titan's upper atmosphere between 500 km and 1500 km, using a one‐dimensional (1‐D) version of the three‐dimensional (3‐D) Titan Global Ionosphere‐Thermosphere Model.
Bell, Jared M., Bougher, Stephen W., Hunter Waite, J., Mandt, Kathleen, Perryman, Rebecca, Ridley, Aaron J., Westlake, Joseph H.   +6 more
core   +1 more source

Photochemical enrichment of deuterium in Titan's atmosphere: new insights from Cassini-Huygens [PDF]

, 2008
Cassini-Huygens data are used to re-examine the potential sources of the D/H enhancement over solar, measured in methane, in Titan's atmosphere. Assuming that the system is closed with respect to carbon, the use of constraints from the Huygens probe for ...
Audrey Moudens, Daniel Cordier, Jonathan I. Lunine, Lee, Olivier Mousis, Orton, Véronique Vuitton, Yelle   +7 more
core   +4 more sources

Methane escape from Titan's atmosphere [PDF]

Journal of Geophysical Research: Planets, 2008
Measurements of the mole fractions of CH4 and 40Ar by the Ion Neutral Mass Spectrometer on the Cassini orbiter are analyzed to determine the rate of vertical mixing in Titan's atmosphere and the escape flux of CH4. Analysis of the 40Ar data indicates an eddy mixing rate of 2–5 × 107 cm2 s−1, an order of magnitude smaller than previously determined from
R. V. Yelle, J. Cui, I. C. F. Müller‐Wodarg   +2 more
openaire   +1 more source

Comparison of terrestrial exospheric hydrogen 3D distributions at solar minimum and maximum using TWINS Lyman-α observations

Frontiers in Astronomy and Space Sciences
Remote sensing observations of far-ultraviolet (FUV) emissions have been used to estimate 3D neutral hydrogen (H) density models of the terrestrial exosphere under solar minimum (2008) and solar maximum (2013 and 2015) conditions.
Jochen H. Zoennchen, Gonzalo Cucho-Padin, Gonzalo Cucho-Padin, Lara Waldrop, Hans J. Fahr   +4 more
doaj   +1 more source

Precipitation of Energetic Neutral Atoms and Induced Non-Thermal Escape Fluxes from the Martian Atmosphere

, 2014
The precipitation of energetic neutral atoms, produced through charge exchange collisions between solar wind ions and thermal atmospheric gases, is investigated for the Martian atmosphere.
Kharchenko, Vasili, Lewkow, Nicholas
core   +1 more source

Ambipolar Electric Field, Photoelectrons, and their Role in Atmospheric Escape From Hot-jupiters [PDF]

, 2012
Atmospheric mass-loss from Hot-jupiters can be large due to the close proximity of these planets to their host star and the strong radiation the planetary atmosphere receives.
Cohen, O., Glocer, A.
core   +3 more sources

Narrow Loophole for H2-Dominated Atmospheres on Habitable Rocky Planets around M Dwarfs

The Astrophysical Journal Letters, 2023
Habitable rocky planets around M dwarfs that have H _2 -dominated atmospheres, if they exist, would permit characterizing habitable exoplanets with detailed spectroscopy using JWST, owing to their extended atmospheres and small stars.
Renyu Hu, Fabrice Gaillard, Edwin S. Kite   +2 more
doaj   +1 more source

Characterizing a World Within the Hot-Neptune Desert: Transit Observations of LTT 9779 b with the Hubble Space Telescope/WFC3

The Astronomical Journal, 2023
We present an atmospheric analysis of LTT 9779 b, a rare planet situated in the hot-Neptune desert, that has been observed with Hubble Space Telescope (HST)/WFC3 with G102 and G141.
Billy Edwards, Quentin Changeat, Angelos Tsiaras, Andrew Allan, Patrick Behr, Simone R. Hagey, Michael D. Himes, Sushuang Ma, Keivan G. Stassun, Luis Thomas, Alexandra Thompson, Aaron Boley, Luke Booth, Jeroen Bouwman, Kevin France, Nataliea Lowson, Annabella Meech, Caprice L. Phillips, Aline A. Vidotto, Kai Hou Yip, Michelle Bieger, Amélie Gressier, Estelle Janin, Ing-Guey Jiang, Pietro Leonardi, Subhajit Sarkar, Nour Skaf, Jake Taylor, Ming Yang, Derek Ward-Thompson   +29 more
doaj   +1 more source