Results 111 to 120 of about 16,853 (286)

Selective sampling of asteroids, the Moon, and Mars: Factors affecting the numerical abundances of members of meteorite groups

Meteoritics &Planetary Science, Volume 60, Issue 7, Page 1502-1519, July 2025.
Abstract Meteorite collection inventories show that many related meteorite groups have very different numerical abundances (e.g., lunar versus Martian meteorites; Eagle Station pallasites versus main‐group pallasites; eucrites versus diogenites; ungrouped Antarctic irons versus ungrouped non‐Antarctic irons; carbonaceous chondrite‐related (CC) iron ...
Alan E. Rubin
wiley   +1 more source

Long-lived planetesimal discs [PDF]

Monthly Notices of the Royal Astronomical Society, 2010
We investigate the survival of planetesimal discs over Gyr timescales, using a unified approach that is applicable to all Keplerian discs of solid bodies -- dust grains, asteroids, planets, etc. Planetesimal discs can be characterized locally by four parameters: surface density, semi-major axis, planetesimal size and planetesimal radial velocity ...
Kevin Heng, Scott Tremaine
openaire   +4 more sources

Volatile-to-sulfur Ratios Can Recover a Gas Giant’s Accretion History

The Astrophysical Journal Letters, 2023
The newfound ability to detect SO _2 in exoplanet atmospheres presents an opportunity to measure sulfur abundances and so directly test between competing modes of planet formation. In contrast to carbon and oxygen, whose dominant molecules are frequently
Ian J. M. Crossfield
doaj   +1 more source

On the observability of resonant structures in planetesimal disks due to planetary migration [PDF]

, 2008
We present a thorough study of the impact of a migrating planet on a planetesimal disk, by exploring a broad range of masses and eccentricities for the planet.
Augereau, Beust, Beust, Chiang, Chiang, Deller, Duncan, Gomes, H. Beust, Holland, Ida, J.-C. Augereau, Kalas, Krivov, Kuchner, Lecavelier Des Etangs, Levison, Morbidelli, Moro-Martín, Murray-Clay, O. Absil, Ozernoy, Quillen, Quillen, R. Reche, Schneider, Sicardy, Smith, Wisdom, Wisdom, Wyatt, Wyatt, Wyatt, Wyatt, Wyatt   +34 more
core   +3 more sources

Evidence for phosphate metasomatism in an olivine‐rich achondrites

Meteoritics &Planetary Science, Volume 60, Issue 6, Page 1302-1317, June 2025.
Abstract Brachinites, brachinite‐like achondrites (BLA), and other similar primitive achondrites offer important constraints on differentiation processes of the earliest formed planetesimals, as they quenched amidst early differentiation processes on their parent body. Geochemical data for all major mineral phases in two previously poorly characterized
Robert W. Nicklas, Melody Z.‐A. Chen, Evan J. Saltman, Ethan F. Baxter, Andrew J. Lonero, Anthony B. Love   +5 more
wiley   +1 more source

Dust Clumping in Outer Protoplanetary Disks: The Interplay among Four Instabilities

The Astrophysical Journal Letters
Dust concentration in protoplanetary disks (PPDs) is the first step toward planetesimal formation, a crucial yet highly uncertain stage in planet formation.
Pinghui Huang, Xue-Ning Bai
doaj   +1 more source

Planetesimal Growth in Evolving Protoplanetary Disks: Constraints from the Pebble Supply

The Astrophysical Journal, 2023
In the core accretion model, planetesimals grow by mutual collisions and engulfing millimeter-to-centimeter particles, i.e., pebbles. Pebble accretion can significantly increase the accretion efficiency and help explain the presence of planets on wide ...
Tong Fang, Hui Zhang, Shangfei Liu, Beibei Liu, Hongping Deng   +4 more
doaj   +1 more source

Linking planetesimal and dust content in protoplanetary disks via a local toy model [PDF]

Astronomy & Astrophysics, 2019
Context. If planetesimal formation is an efficient process, as suggested by several models involving gravitational collapse of pebble clouds, then, not before long, a significant part of the primordial dust mass should be absorbed in many km-sized ...
Konstantin Gerbig, C. Lenz, H. Klahr
semanticscholar   +1 more source

Role of Magma Ocean Differentiation in the Formation and Long‐Term Preservation of Distinct Geochemical Domains Within the Deep Mantle

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 5, May 2025.
Abstract We modeled the evolution of the terrestrial Magma Ocean using the short‐lived 182Hf‐182W isotope system (t1/2 = 8.9 Myr) in a multi‐reservoir early Earth. We start with a chondritic Earth at T0 = 4.567 Ga. Core segregates and attains its present‐day mass, W elemental and isotopic (182W/184W) composition by the end of core formation (TCF).
Seema Kumari, Ramananda Chakrabarti
wiley   +1 more source

Mechanochemical Reactivity of Ribonucleosides Mediated by Inorganic Species: Implications for Extraterrestrial Organic Matter Interpretation

Applied Sciences
Metal species and carbonate are often found as minerals in extraterrestrial rocky bodies. Based on this, the mechanochemical-induced degradation of canonical purine and pyrimidine ribonucleosides into their corresponding nucleobases mediated by some of ...
Gustavo P. Maia, Catarina Gonçalves, Ana J. Carvalho, Vânia André, Adelino Galvão, Ana P. C. Ribeiro, Pedro F. Pinheiro, José Armando Luísa da Silva   +7 more
doaj   +1 more source