Results 91 to 100 of about 16,468 (216)
Formation of Close-in Neptunes around Low-mass Stars through Breaking Resonant Chains
The Astrophysical JournalConventional planet formation theories predict a paucity of massive planets around small stars, especially very low-mass (0.1−0.3 M _⊙ ) mid-to-late M dwarfs. Such tiny stars are expected to form planets of terrestrial sizes but not much bigger. However,
Donald Liveoak, Sarah C. Millholland
doaj +1 more source
MagAO-X and HST High-contrast Imaging of the AS209 Disk at Hα
The Astronomical Journal, 2023 The detection of emission lines associated with accretion processes is a direct method for studying how and where gas giant planets form, how young planets interact with their natal protoplanetary disk, and how volatile delivery to their atmosphere takes
Gabriele Cugno +24 more
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Journal of Geophysical Research: Planets, Volume 130, Issue 10, October 2025.Abstract Thermal convective processes in the liquid cores of terrestrial planetary bodies with the capacity to generate magnetic dynamos may be better characterized by thermal conductivity estimates of core conditions. The composition of the core of asteroid 4 Vesta as determined by geochemical studies of HED meteorites is used as an analog for the ...
E. M. Lenhart, W. Yong, R. A. Secco
wiley +1 more source
A Tale of Dynamical Instabilities and Giant Impacts in the Exoplanet Radius Valley
The Astrophysical Journal LettersThe size distribution of planets with radii between 1 R _⊕ and 4 R _⊕ peaks near 1.4 R _⊕ and 2.2 R _⊕ , with a dip around 1.8 R _⊕ —the so-called “radius valley.” Recent statistical analyses suggest that planets within this valley (1.5
Sho Shibata, Andre Izidoro
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A Quantitative Criterion for Defining Planets
, 2015 A simple metric can be used to determine whether a planet or exoplanet can clear its orbital zone during a characteristic time scale, such as the lifetime of the host star on the main sequence.
Margot, Jean-Luc
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Formation and evolution of exoplanets in different environments
, 2017 Invited Review. To appear in Astronomical Society of the Pacific (ASP) Conference Series "Non-Stable Universe: Energetic Resources, Activity Phenomena and Evolutionary Processes" dedicated to the 70th anniversary of Byurakan Astrophysical ...
openaire +2 more sources
OnAIR: Applications of the NASA on‐board artificial intelligence research platform
AI Magazine, Volume 46, Issue 3, Fall 2025.Abstract Infusing artificial intelligence algorithms into production aerospace systems can be challenging due to costs, timelines, and a risk‐averse industry. We introduce the Onboard Artificial Intelligence Research (OnAIR) platform, an open‐source software pipeline and cognitive architecture tool that enables full life cycle AI research for on‐board ...
Evana Gizzi +30 more
wiley +1 more source
The Polar Orbit of TOI-2374 b, a Planet in the Neptunian Ridge
The Astronomical JournalThe “Neptunian ridge” is a recently identified peak in the frequency of planets with sizes between that of Neptune and Saturn orbiting their host stars with periods between 3 and 6 days.
Samuel W. Yee +13 more
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Imaging Cool Giant Planets in Reflected Light: Science Investigations and Synergy with Habitable Planets [PDF]
, 2019 Planned astronomical observatories of the 2020s will be capable of obtaining reflected light photometry and spectroscopy of cool extrasolar giant planets.
Arney, Giada +40 more
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Journal of Geophysical Research: Planets, Volume 130, Issue 9, September 2025.Abstract We present a new and transformative composition for Venus' cloud aerosols using previously uncharacterized data acquired by the Pioneer Venus Large Probe, which descended through Venus' atmosphere in 1978. This aerosol composition was extracted by re‐analyzing data acquired by the Large Probe Neutral Mass Spectrometer (LNMS) and re‐evaluating ...
R. Mogul +3 more
wiley +1 more source