Results 71 to 80 of about 646 (121)
The Radius Cliff is a Waterfall: Explaining Sub-Neptune Exoplanets with Steam Worlds
The Astrophysical JournalThe demographics of Kepler planets provide a key testbed for models of planet formation and evolution, particularly for explaining the radius valley separating super-Earths and sub-Neptunes.
Aritra Chakrabarty +3 more
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Irradiated Atmospheres. IV. Effect of Mixing Heat Flux on Chemistry
The Astrophysical JournalVertical mixing disrupts the thermochemical equilibrium and introduces additional heat flux that alters exoplanetary atmospheric temperatures. We investigate how this mixing-induced heat flux affects atmospheric chemistry.
Zhen-Tai Zhang +7 more
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A Multispecies Atmospheric Escape Model with Excited Hydrogen and Helium: Application to HD209458b
The Astrophysical JournalAtmospheric escape shapes exoplanet evolution and star–planet interactions, with He I 10830 Å absorption serving as a key tracer of mass loss in hot gas giants.
Anna Ruth Taylor +6 more
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Distinguishing Oceans of Water from Magma on Mini-Neptune K2-18b
The Astrophysical Journal LettersMildly irradiated mini-Neptunes have densities potentially consistent with them hosting substantial liquid-water oceans (“Hycean” planets). The presence of CO _2 and simultaneous absence of ammonia (NH _3 ) in their atmospheres has been proposed as a ...
Oliver Shorttle +4 more
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The Astrophysical JournalPlanet formation models suggest that the small exoplanets that migrate from beyond the snowline of the protoplanetary disk likely contain water-ice-rich cores (∼50% by mass), also known as water worlds.
Aritra Chakrabarty, Gijs D. Mulders
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Precise Constraints on the Energy Budget of WASP-121 b from Its JWST NIRISS/SOSS Phase Curve
The Astronomical JournalUltra-hot Jupiters exhibit day-to-night temperature contrasts upwards of 1000 K due to competing effects of strong winds, short radiative timescales, magnetic drag, and H _2 dissociation/recombination. Spectroscopic phase curves provide critical insights
Jared Splinter +22 more
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The Astrophysical JournalConvective processes are crucial in shaping exoplanetary atmospheres but are computationally expensive to simulate directly. A novel technique of simulating moist convection on tidally locked exoplanets is to use a global 3D model with a stretched mesh ...
Denis E. Sergeev +7 more
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, 2020 Nowdays, we are able to discover more and more exoplanets, and even more important we can observe their atmospheres and we are starting to get information on their physical, dynamic and, chemical properties. With the new generation of space telescopes such as the JWST or Ariel, we will be able to observe spectral features that are now unobservable ...
openaire +1 more source
A global map of the atmospheric circulation and thermal structure for an ultrahot exoplanet
, 2017 WASP-121b is one of the standout exoplanets available for atmospheric characterization, both in transmission and emission, due to its large radius (1.8 Jupiter radii), high temperature ( 2700K), and bright host star (H=9.4mag).
Barstow, Joanna +13 more
core
JWST/NIRISS Reveals the Water-rich “Steam World” Atmosphere of GJ 9827 d
The Astrophysical Journal LettersWith sizable volatile envelopes but smaller radii than the solar system ice giants, sub-Neptunes have been revealed as one of the most common types of planet in the galaxy. While the spectroscopic characterization of larger sub-Neptunes (2.5–4 R _⊕ ) has
Caroline Piaulet-Ghorayeb +32 more
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