Results 61 to 70 of about 4,639 (216)
Meteoritics &Planetary Science, Volume 61, Issue 10, Page 2567-2591, October 2026.Abstract We report on the petrography and oxygen isotopic compositions from in situ analyses of carbonates (Ca‐carbonate, dolomite, and Fe‐rich magnesite), magnetite, and apatite in particles from asteroid Bennu. Using oxygen isotope thermometry of Ca‐carbonate, dolomite, and magnetite, we estimated crystallization temperatures and the oxygen isotopic ...
Gary R. Huss +12 more
wiley +1 more source
Modeling Carbon Outgassing from Chondritic Planetesimals
The Planetary Science JournalThe thermochemical evolution of planetesimals is an underprobed stage of volatile delivery to terrestrial planets during their formation, and may contribute to the volatile depletion of the Earth relative to primitive chondrites.
Bo Peng, Diana Valencia
doaj +1 more source
Rapid Dust Growth during Hydrodynamic Clumping due to Streaming Instability
The Astrophysical Journal, 2023 Streaming instability is considered to be one of the dominant processes in promoting planetesimal formation by the gravitational collapse of dust clumps.
Ryosuke T. Tominaga, Hidekazu Tanaka
doaj +1 more source
Post-main sequence thermal evolution of planetesimals [PDF]
, 2023 White dwarfs that have accreted planetary materials provide a powerful tool to probe the interiors and formation of exoplanets. In particular, the high Fe/Si ratio of some white dwarf pollutants suggests that they are fragments of bodies that were heated
Bonsor, Amy, Shorttle, Oliver, Li, Yuqi
core +1 more source
Journal of Geophysical Research: Planets, Volume 131, Issue 9, September 2026.Abstract Water ice is an important rock‐forming mineral, both on the Earth and on various extraterrestrial bodies. Naturally occurring ice is often “dirty”–an intimate mixture with harder mineral grains, which can have significant effects on the bulk properties of the aggregate. We have used neutron powder diffraction, with in situ triaxial deformation,
Ceri A. Middleton +9 more
wiley +1 more source
The Astrophysical JournalContinuing our initiative on advancing the calculations of planetesimal accretion in the core-accretion model, we present here the results of our recent study of the contributions of planetesimals around and beyond the orbit of Saturn.
Nader Haghighipour +2 more
doaj +1 more source
A Long‐Lived Planetesimal Dynamo Powered by Core Crystallization
Geophysical Research Letters, 2021 The existence of numerous iron meteorite groups indicates that some planetesimals underwent melting that led to metal‐silicate segregation, sometimes producing metallic cores.
Clara Maurel +6 more
doaj +1 more source
Meteoritics &Planetary Science, Volume 61, Issue 9, Page 2393-2405, September 2026.Abstract The light element distribution in planetary cores and the processes driving core evolution in rocky planets are poorly understood. Magmatic iron meteorites are samples from the cores of ancient embryonic planetesimals and therefore provide a window into the processes governing core evolution. We performed high precision oxygen isotope analyses
R. J. Windmill +4 more
wiley +1 more source
Crystallization of dmisteinbergite (hexagonal CaAl2Si2O8) from type B CAI analog melt
Meteoritics &Planetary Science, Volume 61, Issue 9, Page 2258-2268, September 2026.Abstract Dmisteinbergite is a metastable polymorph of CaAl2Si2O8, which has been found in calcium−aluminum‐rich inclusions (CAIs) in chondrites, although anorthite is the predominant CaAl2Si2O8 phase in natural type B CAIs. The occurrence/absence of igneous dmisteinbergite would put tighter constraints on the thermal history of CAIs.
Yasuaki Tsuruoka +6 more
wiley +1 more source
Carbon to oxygen ratios in extrasolar planetesimals [PDF]
, 2016 Observations of small extrasolar planets with a wide range of densities imply a variety of planetary compositions and structures. Currently, the only technique to measure the bulk composition of extrasolar planetary systems is the analysis of planetary ...
Ansicke, BTG +3 more
core +3 more sources