Results 101 to 110 of about 162,796 (182)

Solar Wind Power Likely Governs Uranus' Thermosphere Temperature

open access: yesGeophysical Research Letters, Volume 51, Issue 22, 28 November 2024.
Abstract Observations of Uranus in the near‐infrared by ground‐based telescopes from 1992 to 2018 have shown that the planet's upper atmosphere (thermosphere) steadily cooled from ∼700 to ∼450 K. We explain this cooling as due to the concurrent decline in the power of the solar wind incident on Uranus' magnetic field, which has dropped by ∼50% over the
A. Masters   +3 more
wiley   +1 more source

Identifying Exoplanet Candidates Using WaveCeptionNet

open access: yesThe Astronomical Journal
In this study, we propose a wavelet-transform-based light curve representation method and a CNN model based on Inception-v3 for fast classification of light curves, enabling the quick discovery of potentially interesting targets from massive data ...
Huiping Liao   +4 more
doaj   +1 more source

Nitrogen Fixation at Paleo‐Mars in an Icy Atmosphere

open access: yesGeophysical Research Letters, Volume 51, Issue 21, 16 November 2024.
Abstract Recent findings of NO near Gale Crater on Mars have been explained by two pathways: formation of nitric acid (HNO3) in a warm climate or formation of peroxynitric acid (HO2NO2) in a cool climate. Here, we put forth two hitherto unexplored pathways: (a) deposition of nitric/peroxynitric acid onto ice particles in a cold atmosphere, which settle
Danica Adams   +6 more
wiley   +1 more source

A Direct Comparison between the Use of Double Gray and Multiwavelength Radiative Transfer in a General Circulation Model with and without Radiatively Active Clouds

open access: yesThe Astrophysical Journal
Inhomogeneous cloud formation and wavelength-dependent phenomena are expected to shape hot Jupiter atmospheres. We present a general circulation model with multiwavelength “picket fence” radiative transfer and radiatively active, temperature-dependent ...
Isaac Malsky   +7 more
doaj   +1 more source

Comprehensive Comparison of Two Global Multi‐Species MHD Models of Mars

open access: yesEarth and Space Science, Volume 11, Issue 10, October 2024.
Abstract Understanding the interaction between Mars and the solar wind is crucial for comprehending the atmospheric evolution and climate change on Mars. To gain a comprehensive understanding of the Martian plasma environment, global numerical simulations are essential in addition to spacecraft observations. However, there are still discrepancies among
Wenyi Sun   +9 more
wiley   +1 more source

Geodynamics of Super‐Earth GJ 486b

open access: yesJournal of Geophysical Research: Planets, Volume 129, Issue 10, October 2024.
Abstract Many super‐Earths are on very short orbits around their host star and, therefore, more likely to be tidally locked. Because this locking can lead to a strong contrast between the dayside and nightside surface temperatures, these super‐Earths could exhibit mantle convection patterns and tectonics that could differ significantly from those ...
Tobias G. Meier   +10 more
wiley   +1 more source

Toward High-precision Mass Measurements of Two Sub-Neptunes in the K2-266 Planetary System Through Transit Timing

open access: yesThe Astronomical Journal
Sub-Neptunes have been found to be one of the most common types of exoplanets, yet their physical parameters and properties are poorly determined and in need of further investigation.
Ing-Guey Jiang   +5 more
doaj   +1 more source

Majority of water hides deep in the interiors of exoplanets [PDF]

open access: yesNature Astronomy, 2024
Water is an important component of exoplanets, with its distribution, i.e., whether at the surface or deep inside, fundamentally influencing the planetary properties. The distribution of water in most exoplanets is determined by yet-unknown partitioning coefficients at extreme conditions.
arxiv   +1 more source

A Comprehensive Analysis of Spitzer 4.5 μm Phase Curves of Hot Jupiters

open access: yesThe Astronomical Journal
Although exoplanetary science was not initially projected to be a substantial part of the Spitzer mission, its exoplanet observations set the stage for current and future surveys with JWST and Ariel.
Lisa Dang   +21 more
doaj   +1 more source

Helium in the Extended Atmosphere of the Warm Superpuff TOI-1420b

open access: yesThe Astronomical Journal
Superpuffs are planets with exceptionally low densities ( ρ ≲ 0.1 g cm ^−3 ) and core masses ( M _c ≲ 5 M _⊕ ). Many lower-mass ( M _p ≲ 10 M _⊕ ) superpuffs are expected to be unstable to catastrophic mass loss via photoevaporation and/or boil-off ...
Shreyas Vissapragada   +13 more
doaj   +1 more source

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