Results 91 to 100 of about 4,544 (213)

Collisions of Planetesimals and Formation of Planets [PDF]

Proceedings of the International Astronomical Union, 2015
AbstractWe present preliminary results of models of terrestrial planet formation using on the one hand classical numerical integration of hundreds of small bodies on CPUs and on the other hand—for comparison—the results of our GPU code with thousands of small bodies which then merge to larger ones.
Dvorak, Rudolf, Maindl, Thomas, Süli, Áron, Schäfer, Christoph, Speith, Roland, Burger, Christoph   +5 more
openaire   +2 more sources

Potassium isotopic compositions and exposure ages of evolved and silica‐rich achondrites

Meteoritics &Planetary Science, Volume 61, Issue 8, Page 2140-2162, August 2026.
Abstract Some of the oldest igneous rocks in the Solar System include evolved and silica‐rich achondrites that originate from parent bodies less than 1000 km in diameter, referred to as planetesimals. While Earth was initially in a molten state and required continental crust formation and plate tectonics to generate andesite bulk compositions, evolved ...
Z. Vaci, Z. Tian, P. Koefoed, M. Habermann, M. Humayun, K. Ziegler, H. Busemann, D. Krietsch, J. M. D. Day, K. Wang   +9 more
wiley   +1 more source

On the filtering and processing of dust by planetesimals 1. Derivation of collision probabilities for non-drifting planetesimals

, 2013
A&A, 572, A72 (2014). 31 pages, 29 figures. (Final version)International audienceContext. Circumstellar disks are known to contain a significant mass in dust ranging from micron to centimeter size.
Guillot, Tristan, Tristan Guillot, Ida, Shigeru, Chris W. Ormel, Ormel, Chris, W., Ormel, Chris,, Shigeru Ida   +6 more
core   +1 more source

From planetesimals to planets with N-body simulations in the giant-planet formation region

Astronomy & Astrophysics
The cores of wide-orbit giant planets can form via pebble accretion if large planetesimals form in the outer regions of protoplanetary discs at sufficiently early times.
Lorek Sebastian, Lambrechts Michiel
doaj   +1 more source

Iron‐Silicate Segregation Within a Convecting Magma Ocean via the Multiphase Thermal Lattice Boltzmann Method: Implication on Iron‐Silicate Mixing

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract During the late stages of planetary accretion, large differentiated impactors interacted with the Earth's magma ocean, producing clouds of iron droplets that sank and mixed with silicates. Using a novel fluid‐dynamic approach combining the Thermal and Rothman‐Keller multiphase Lattice Boltzmann Methods, we modeled the segregation of impactor ...
L. Honarbakhsh, G. Morra, P. Mora, C. R. M. Jackson   +3 more
wiley   +1 more source

Surface Geology and Evolution of Asteroid Ryugu: Insights From Hayabusa2 Global Mapping

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract Rubble‐pile asteroids, characterized by loose aggregates of debris held together by gravity, represent both a significant planetary hazard and a key to understanding planetesimal formation. Geologic mapping of these bodies provides essential insights into their origins, evolution, and surface processes.
Lisa M. Vincent, Trishit Ruj, Goro Komatsu, Aditya Ray, Hiroshi Kikuchi, Ryodo Hemmi, Hideaki Miyamoto, Seiji Sugita, the Hayabusa2 ONC science team   +8 more
wiley   +1 more source

Evolution of Sulfur Concentration in the Deep Earth During the Proto‐Earth Growth: First‐Principles Study on the Sulfur Partitioning Between Metal and Silicate at High Pressure and Temperature

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 7, July 2026.
Abstract Sulfur (S) is one of the promising light elements that can explain the density deficit of the core. The degree of siderophile nature of S under high pressure and temperature (P,T) is the key to estimating the S content in the core. However, a significant discrepancy between the metal‐silicate partition coefficient of S extrapolated from ...
K. Itoh, T. Tsuchiya
wiley   +1 more source

Pebbles versus planetesimals: the case of Trappist-1 [PDF]

, 2019
We present a study into the formation of planetary systems around low mass stars similar to Trappist-1, through the accretion of either planetesimals or pebbles. The aim is to determine if the currently observed systems around low mass stars could favour
Coleman, G. A. L., Leleu, A., A. Leleu, W. Benz, Y. Alibert, Benz, W., Alibert, Y., G. A. L. Coleman   +7 more
core   +1 more source

Terrestrial Planet Formation from Two Source Reservoirs

The Astronomical Journal
This work describes new dynamical simulations of terrestrial planet formation. The simulations started at the protoplanetary disk stage, when planetesimals formed and accreted into protoplanets, and continued past the late stage of giant impacts.
David Nesvorný, Alessandro Morbidelli, William F. Bottke, Rogerio Deienno, Max Goldberg   +4 more
doaj   +1 more source

Dust evolution during protoplanetary disk buildup enhances CO ice relative to water

Astronomy & Astrophysics
Context. Water ice is expected to be the dominant volatile component of bodies formed in the outer Solar System. However, recent observations of comets and trans-Neptunian objects suggest that the relative abundances of ices can vary substantially, with ...
Drążkowska J.
doaj   +1 more source