Results 61 to 70 of about 5,332 (183)

Disentangling Metallicity Effects in Hot Jupiter Occurrence across Galactic Birth Radius and Phase-space Density

The Astronomical Journal
We explore how the correlation between host star metallicity and giant planets shapes hot Jupiter occurrence as a function of Galactic birth radius ( R _birth ) and phase-space density in the Milky Way disk.
Rayna Rampalli, Melissa K. Ness, Elisabeth R. Newton, Andrew Vanderburg, Tobias Buck, Jessica Mills   +5 more
doaj   +1 more source

A Tale of Two Disks: Mapping the Milky Way with the Final Data Release of APOGEE

The Astrophysical Journal, 2023
We present new maps of the Milky Way disk showing the distribution of metallicity ([Fe/H]), α -element abundances ([Mg/Fe]), and stellar age, using a sample of 66,496 red giant stars from the final data release (DR17) of the Apache Point Observatory ...
Julie Imig, Cathryn Price, Jon A. Holtzman, Alexander Stone-Martinez, Steven R. Majewski, David H. Weinberg, Jennifer A. Johnson, Carlos Allende Prieto, Rachael L. Beaton, Timothy C. Beers, Dmitry Bizyaev, Michael R. Blanton, Joel R. Brownstein, Katia Cunha, José G. Fernández-Trincado, Diane K. Feuillet, Sten Hasselquist, Christian R. Hayes, Henrik Jönsson, Richard R. Lane, Jianhui Lian, Szabolcs Mészáros, David L. Nidever, Annie C. Robin, Matthew Shetrone, Verne Smith, John C. Wilson   +26 more
doaj   +1 more source

An Intermediate-Age α-Rich Galactic Population Beyond the Solar Neighborhood [PDF]

, 2020
Understanding the chemical history of the Galaxy is essential for developing theories and models for our Galaxy's formation history. I expanded on the results of previous work studying the relationship between chemical composition and age in the Kepler ...
Warfield, Jack
core  

Surface Air Enrichment of Cosmogenic 35S at a Subtropical Site During the May 2024 Solar Superstorm

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract Cosmogenic radiosulfur (35S) is produced in the atmosphere by high‐energy particle interactions and serves as a sensitive tracer of stratospheric intrusions. In May 2024, an extreme solar storm provided a rare opportunity to examine atmospheric 35S responses to intense solar activity.
Xinling Zou, Lin Su, Zhisheng Zhang, Xiaomin Lin, Mang Lin   +4 more
wiley   +1 more source

Carbon-Enhanced Metal-Poor Stars, the Cosmic Microwave Background, and the Stellar IMF in the Early Universe

, 2007
The characteristic mass of stars at early times may have been higher than today owing to the cosmic microwave background (CMB). This study proposes that (1) the testable predictions of this "CMB-IMF" hypothesis are an increase in the fraction of carbon ...
Diemand J., Duquennoy A., Jason Tumlinson   +2 more
core   +1 more source

Asteroseismology for Galactic archaeology: bridging two fields [PDF]

Proceedings of the International Astronomical Union, 2015
AbstractAsteroseismology has the capability of precisely determining stellar properties that would otherwise be inaccessible, such as radii, masses, and thus ages of field stars. When coupling this information with classical determinations of stellar parameters, such as metallicities, effective temperatures, and angular diameters, powerful new ...
Luca Casagrande, Victor Silva Aguirre, Aldo M. Serenelli   +2 more
openaire   +1 more source

Environmental and Temporal Effects on Vocal Activity in a Nocturnal Primate: Implications for Passive Acoustic Monitoring

American Journal of Primatology, Volume 88, Issue 3, March 2026.
Passive acoustic monitoring of the Critically Endangered Nosy Be sportive lemur (Lepilemur tymerlachsoni) for two lunar cycles revealed that vocal activity (i.e., call rates) increased over a 4‐h sampling window starting at twilight. The lemurs also called more as temperature and moonlight increased, and called less when it rained.
Luke D. Martin, Eva S. Nomenjanahary, Herison Razafimanantsoa, Sylviane Volampeno, Alice M. Richardson, Robert D. Magrath, Alison M. Behie   +6 more
wiley   +1 more source

[C/N] Ages for Red Giants and Their Implications for Galactic Archaeology

The Astrophysical Journal
Red giants undergo the first dredge-up, a mixing event that creates a connection between their surface [C/N] and their mass and age. We derive a [C/N]–age relationship for red giants calibrated on Apache Point Observatory Galactic Evolution Experiment ...
John D. Roberts, Marc H. Pinsonneault, Jennifer A. Johnson, Liam O. Dubay, James W. Johnson   +4 more
doaj   +1 more source

Holocene History of the Lower Seine Estuary and the Commerce Valley Tributary (Normandy, France): A Palaeoenvironmental Framework for the Roman Landscape of Juliobona (Lillebonne) and Implication for Port Conditions

Geoarchaeology, Volume 41, Issue 2, March/April 2026.
ABSTRACT The sediment infill deposits of the Lower Commerce Valley in the Seine estuary, located near the Roman city of Juliobona (now Lillebonne, Normandy), provide valuable data on environmental changes during the Holocene, including sea‐level changes, sediment supply and anthropogenic influences.
Léa Mairaville, Stoil Chapkanski, Dominique Todisco, Cécile Finco, Christine Paillès, Jonas Parétias, Thierry Lepert, Amine Haddad, Johanne Ducastel, Fabrice Boufflers, Jérémy Leleu, Laurent Dezileau, Damase Mouralis   +12 more
wiley   +1 more source

Rangitīkei River Terraces Formed During the Otira Glaciation: Lithostratigraphic Type Sections, Review and Conceptual Model

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
The Rangitīkei Valley in the lower North Island of New Zealand contains flights of river terraces that are influenced by changes in sediment supply, stream power and base level associated with Quaternary climate events over the last ∼350 thousand years.
Callum Rees, Alan Palmer, Utiku Potaka
wiley   +1 more source