Results 41 to 50 of about 293 (162)

StarFlow: Leveraging Normalizing Flows for Stellar Age Estimation in SDSS-V DR19

The Astronomical Journal
Understanding the ages of stars is crucial for unraveling the formation history and evolution of our Galaxy. Traditional methods for estimating stellar ages from spectroscopic data often struggle with providing appropriate uncertainty estimations and are
Alexander Stone-Martinez, Jon A. Holtzman, Yuxi(Lucy) Lu, Sten Hasselquist, Julie Imig, Emily J. Griffith, Earl P. Bellinger, Andrew K. Saydjari   +7 more
doaj   +1 more source

A Thermal Origin to the Asymmetry of the Permanent Dust Cloud at the Moon

Journal of Geophysical Research: Planets, Volume 130, Issue 10, October 2025.
Abstract The Moon's surface, lacking an atmosphere, is continually bombarded by high‐speed micro‐meteoroids, creating a highly porous regolith composed of very fine grains. This regolith's porosity decreases with depth due to compression. Besides creating vapor and melt, micro‐meteoroid impacts eject lunar dust, redistributing regolith grains, which ...
Sébastien Verkercke, Cem Berk Senel, Robert Luther, Menelaos Sarantos, Elena Martellato, Gareth S. Collins, Lisa Krämer Ruggiu, Steven Goderis, Özgür Karatekin, Philippe Claeys   +9 more
wiley   +1 more source

TransformerPayne: Enhancing Spectral Emulation Accuracy and Data Efficiency by Capturing Long-range Correlations

The Astrophysical Journal
Stellar spectra emulators often rely on large grids and tend to reach a plateau in emulation accuracy, leading to significant systematic errors when inferring stellar properties.
Tomasz Różański, Yuan-Sen Ting, Maja Jabłońska   +2 more
doaj   +1 more source

Fecal Biomarkers in Soils Record Landscape‐Scale Wild Herbivore Abundance

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 9, September 2025.
Abstract In Earth history, our understanding of how large‐bodied herbivores shape a variety of ecosystem processes is limited by the quality of paleoecological proxies for herbivore composition and abundance. Fecal stanols are lipids that can be produced by microbes within animal digestive systems and that could remedy this dearth of proxies.
A. Tyler Karp, James M. Russell, Joel O. Abraham, Tercia Strydom, A. Carla Staver   +4 more
wiley   +1 more source

Mining an Anthropocene in Japan: On the making and work of geological imaginaries

Transactions of the Institute of British Geographers, Volume 50, Issue 3, September 2025.
Short Abstract This article addresses how the lithic and the drift might be reworked as an Anthropocene material outside of a chronostratigraphy. Revisiting the finding of a floating fern fossil at the Hashima mine, we delve into a complex array of Geological imaginaries, and undertake our own speculative work.
Deborah P. Dixon, Carina J. Fearnley, Mark Pendleton   +2 more
wiley   +1 more source

Regional onset of Holocene drying period estimated from sand deposit analyses in Kharga Oasis, Western Desert, Egypt

Journal of Quaternary Science, Volume 40, Issue 6, Page 1106-1119, August 2025.
ABSTRACT Desertification in North Africa has progressed rapidly over the past 6000 years. The occupation of Egypt by the Achaemenid Persians and Romans occurred even in hyperarid climates. Understanding the process of environmental changes on a regional scale may improve knowledge of how people developed technologies and adapted to the natural ...
Makiko Watanabe, Hiroyuki Kamei
wiley   +1 more source

Disentangling Impact Ejecta Dynamics Using Micro–X‐Ray Fluorescence (μ‐XRF): A Case Study From the Terrestrial Cretaceous‐Paleogene (K‐Pg) Boundary

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 8, August 2025.
Abstract This study presents a non‐destructive geochemical and petrographic workflow to generate high‐resolution chemostratigraphic records across key stratigraphic intervals, exemplified by a terrestrial Cretaceous‐Paleogene (K‐Pg) boundary sequence preserved at Starkville South (Raton Basin, Colorado, USA).
Pim Kaskes, Roald Tagle, Mariia Rey, Steven Goderis, Sophie Decrée, Jan Smit, Philippe Claeys   +6 more
wiley   +1 more source

[X/Fe] Marks the Spot: Mapping Chemical Azimuthal Variations in the Galactic Disk with APOGEE

The Astrophysical Journal
Chemical cartography of the Galactic disk provides insights into its structure and assembly history over cosmic time. In this work, we use chemical cartography to explore chemical gradients and azimuthal substructure in the Milky Way disk with giant ...
Zoe Hackshaw, Keith Hawkins, Carrie Filion, Danny Horta, Chervin F. P. Laporte, Christopher Carr, Adrian M. Price-Whelan   +6 more
doaj   +1 more source

Advanced Monitoring of Subsurface Sediment Structures Within Gravel Berms

Journal of Geophysical Research: Earth Surface, Volume 130, Issue 8, August 2025.
Abstract Berms composed of surface gravel and underlying sand and gravel mix (gravel berms) naturally form on beaches and can help mitigate coastal erosion and flooding. Previous studies suggest that subsurface sediments influence gravel berm behavior, although detailed investigations remain limited.
H. Matsumoto, G. Shtienberg, A. P. Young
wiley   +1 more source

Cosmological Simulations of Stellar Halos with Gaia Sausage–Enceladus Analogs: Two Sausages, One Bun?

The Astrophysical Journal
Observations of the Milky Way’s stellar halo find that it is predominantly comprised of a radially biased population of stars, dubbed the Gaia Sausage–Enceladus, or GSE.
Dylan Folsom, Mariangela Lisanti, Lina Necib, Danny Horta, Mark Vogelsberger, Lars Hernquist   +5 more
doaj   +1 more source