Results 61 to 70 of about 5,562 (188)

Long‐Lasting Volcanism of the Moon Aided by the Switch in Dominant Mechanisms of Magma Ascent: Role of Localized Radioactive Enrichment in a Numerical Model of Magmatism and Mantle Convection

Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.
Abstract Significant volcanic activity continued for billions of years since 3.5–4 Gyr ago in the Procellarum KREEP Terrane (PKT) of the Moon, but not so significant outside the PKT. To understand this volcanic history, we developed a 2‐D numerical model of magmatism and mantle convection; the effects of the PKT on lunar evolution are considered by ...
Ken'yo U, Masanori Kameyama, Gaku Nishiyama, Takehiro Miyagoshi, Masaki Ogawa   +4 more
wiley   +1 more source

An Eccentric Sub-Neptune Moving Into the Evaporation Desert

The Astrophysical Journal Letters
Though missions such as Kepler, K2, and TESS have discovered >2000 sub-Neptune and Neptunian planets, there is a dearth of such planets at close-in ( P ≲ 3 days) orbits. This feature, called the Neptune desert or the evaporation desert, is believed to be
Sydney A. Jenkins, Andrew Vanderburg, Ritika Sethi, Sarah Millholland, Joseph E. Rodriguez, Luca Fossati, Andreas Krenn, Emily Pass, Alexander Venner, R. Paul Butler, Hugh Osborn, Aaron Householder, Carl Ziegler, Juliette Becker, Perry Berlind, Allyson Bieryla, Christopher Broeg, Michael L. Calkins, Jeffrey D. Crane, Tansu Daylan, Julien de Wit, Jason D. Eastman, David Ehrenreich, Gilbert A. Esquerdo, Michael Fausnaugh, Yadira Gaibor, David W. Latham, Monika Lendl, Andrew W. Mayo, Gaetano Scandariato, Steve Shectman, Stephanie Striegel, Johanna Teske, Thomas G Wilson   +33 more
doaj   +1 more source

Tracing the Contribution of Abiotic Methane in Deep Natural Gases From the Songliao Basin, China Using Bulk Isotopes and Methane Clumped Isotopologue 12CH2D2

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract The identification and evaluation of abiotic methane remain an active research area due to uncertainties in traditional indicators that may lead to “false‐positive” detections. As an emerging isotopic tool, methane clumped isotope can provide novel information about the generation and post‐generation processes of methane gases.
Jiacheng Li, Qingmei Liu, Wenmin Jiang, Yun Li, Yanhua Shuai, Yongqiang Xiong   +5 more
wiley   +1 more source

Testing the Origin of Hot Jupiters with Atmospheric Surveys

The Astrophysical Journal
In spite of their long detection history, the origin of hot Jupiters remains to be resolved. While dynamical evidence suggests high-eccentricity migration is most likely, conflicts remain when considering hot Jupiters as a population in the context of ...
Lina D’Aoust, Ben Coull-Neveu, Eve J. Lee, Nicolas B. Cowan   +3 more
doaj   +1 more source

Orbital Alignment of the Eccentric Warm Jupiter TOI-677 b

The Astronomical Journal, 2023
Warm Jupiters lay out an excellent laboratory for testing models of planet formation and migration. Their separation from the host star makes tidal reprocessing of their orbits ineffective, which preserves the orbital architectures that result from the ...
Elyar Sedaghati, Andrés Jordán, Rafael Brahm, Diego J. Muñoz, Cristobal Petrovich, Melissa J. Hobson   +5 more
doaj   +1 more source

Migration and Evolution of giant ExoPlanets (MEEP). II. Super-Jupiters and Lithium-rich host stars

Monthly Notices of the Royal Astronomical Society
ABSTRACT Although hot Jupiters were the first exoplanets discovered orbiting main-sequence stars, the dominant mechanisms through which they form and evolve are not known. To address the questions surrounding their origins, the Migration and Evolution of giant ExoPlanets (MEEP) survey aims to create a complete, magnitude-limited ($G& ...
Jack Schulte, Joseph E Rodriguez, David W Latham, Joshua V Shields, Noah Vowell, Melinda Soares-Furtado, Brooke Kotten, Xian-Yu Wang, Karen A Collins, Allyson Bieryla, Samuel N Quinn, Paul Benni, Catherine A Clark, Matthew W Craig, Mara L DeRung, Jason D Eastman, Zahra Essack, Phil Evans, Rebecca Gore, Steve B Howell, John F Kielkopf, Colin Littlefield, Andrew W Mann, Giuseppe Marino, Don J Radford, Chris Stockdale, Ivan A Strakhov, Thiam-Guan Tan, Michael Vezie, Songhu Wang, Emily Watson, Samuel W Yee, Carl Ziegler   +32 more
openaire   +2 more sources

Initial Thermal States of Super‐Earth Exoplanets and Implications for Early Dynamos

Journal of Geophysical Research: Planets, Volume 130, Issue 2, February 2025.
Abstract The accretion of Earth and the formation of a metallic core released a large amount of primordial heat and may have enabled its evolution into a habitable world. Metal‐silicate segregation likely occurs in super‐Earth exoplanets as well, but its influence on their initial thermal states has not been fully examined.
Nathaniel I. White, Jie Li
wiley   +1 more source

The debris disk - terrestrial planet connection

, 2011
The eccentric orbits of the known extrasolar giant planets provide evidence that most planet-forming environments undergo violent dynamical instabilities.
Amaya Moro-Martín, Avi M. Mandell, Fogg, Franck Selsis, John C. Armstrong, Mark Booth, Mark C. Wyatt, Mayor, Philip J. Armitage, Sean N. Raymond, Zakamska   +10 more
core   +3 more sources

Geodynamics of Super‐Earth GJ 486b

Journal 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, Dan J. Bower, Tim Lichtenberg, Mark Hammond, Paul J. Tackley, Raymond T. Pierrehumbert, José A. Caballero, Shang‐Min Tsai, Megan Weiner Mansfield, Nicola Tosi, Philipp Baumeister   +10 more
wiley   +1 more source

Resonant and Ultra-short-period Planet Systems Are at Opposite Ends of the Exoplanet Age Distribution

The Astronomical Journal
Exoplanet systems are thought to evolve on secular timescales over billions of years. This evolution is impossible to directly observe on human timescales in most individual systems.
Stephen P. Schmidt, Kevin C. Schlaufman, Jacob H. Hamer   +2 more
doaj   +1 more source