Results 31 to 40 of about 646 (121)
Early Time Small-scale Structures in Hot Exoplanet Atmosphere Simulations
The Astrophysical JournalAbstract We report on the critical influence of small-scale flow structures (e.g., fronts, vortices, and waves) that immediately arise in hot exoplanet atmosphere simulations initialized with a resting state. A hot, 1:1 spin–orbit synchronized Jupiter is used here as a clear example; but, the phenomenon is generic and important for any ...
J. W. Skinner, J. Y-K. Cho
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Atmospheric C/O Ratios of Sub-Neptunes with Magma Oceans: Homemade rather than Inherited
The Astrophysical Journal LettersRecently, the James Webb Space Telescope has enabled detailed spectroscopic characterization of sub-Neptune atmospheres. With detections of carbon- and oxygen-bearing species such as CO, CO _2 , CH _4 , and H _2 O, a central question is whether the ...
Aaron Werlen +4 more
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The Astrophysical Journal, 2023 Atmospheric nitrogen may provide important constraints on giant planet formation. Following our semianalytical work, we further pursue the relation between observable NH _3 and an atmosphere’s bulk nitrogen abundance by applying the photochemical ...
Kazumasa Ohno, Jonathan J. Fortney
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Sub-Neptunes Are Drier than They Seem: Rethinking the Origins of Water-rich Worlds
The Astrophysical Journal LettersRecent claims of biosignature gases in sub-Neptune atmospheres have renewed interest in water-rich sub-Neptunes with surface oceans, often referred to as Hycean planets. These planets are hypothesized to form beyond the snow line, accreting large amounts
Aaron Werlen +5 more
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: Enabling self-consistent exoplanet atmospheric retrievals with machine learning [PDF]
Context. Interpreting the observations of exoplanet atmospheres to constrain physical and chemical properties is typically done using Bayesian retrieval techniques.
P. I. Palmer +9 more
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The Effects of Non-ideal Mixing in Planetary Magma Oceans and Atmospheres
The Astrophysical JournalSub-Neptunes with hydrogen-rich envelopes are expected to sustain long-lived magma oceans that continuously exchange volatiles with their overlying atmospheres.
Aaron Werlen +4 more
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The Runaway Greenhouse Effect on Hycean Worlds
The Astrophysical Journal, 2023 Hycean worlds are a proposed subset of sub-Neptune exoplanets with substantial water inventories, liquid surface oceans, and extended hydrogen-dominated atmospheres favorable for habitability.
Hamish Innes +2 more
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Exoplanet atmospheres: A theoretical outlook
, 2010 With over two dozen exoplanet atmospheres observed today, the field of exoplanet atmospheres is solidly established. The highlights of exoplanet atmosphere studies include: detection of molecular spectral features; constraints on atmospheric vertical ...
Sara Seager
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Thermoelastic Contraction as a Suppressor of Atmospheric Escape in Close-in Exoplanets
The Astrophysical JournalThe survival of volatile-rich atmospheres on close-in exoplanets challenges classical escape models. We identify a fully classical, interior-driven correction: thermoelastic contraction of the planetary mantle slightly increases the gravitational binding
L. Yıldız, D. Kaykı, E. Güdekli
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Helium Escape in Context: Comparative Signatures of Four Close-in Exoplanets
The Astrophysical JournalObservations of escaping atmospheres on close-in exoplanets show a wide range in the strength and morphology of He I 10830 Å and H I absorption. Scaling relations attempt to link the He I signal to X-ray and UV irradiation, mass loss, and bulk planetary ...
Anna Ruth Taylor +4 more
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