Results 71 to 80 of about 42,848 (232)

Origin of Low-26Al/27Al Corundum/Hibonite Inclusions in Meteorites

The Astrophysical Journal, 2023
Most meteoritic calcium-rich, aluminum-rich inclusions formed from a reservoir with ^26 Al/ ^27 Al ≈ 5 × 10 ^−5 , but some record lower ${({}^{26}\mathrm{Al}/{}^{27}\mathrm{Al})}_{0}$ , demanding they sampled a reservoir without live ^26 Al.
Steven J. Desch, Emilie T. Dunham, Ashley K. Herbst, Cayman T. Unterborn, Thomas G. Sharp, Maitrayee Bose, Prajkta Mane, Curtis D. Williams   +7 more
doaj   +1 more source

Mixing in the Solar Nebula: Implications for Isotopic Heterogeneity and Large-Scale Transport of Refractory Grains [PDF]

, 2008
The discovery of refractory grains amongst the particles collected from Comet 81P/Wild 2 by the Stardust spacecraft (Brownlee et al. 2006) provides the ground truth for large-scale transport of materials formed in high temperature regions close to the ...
Alan P. Boss, Ali, Amelin, Andreasen, Andrews, Bizzarro, Boss, Boss, Boss, Boss, Boss, Boss, Boss, Brownlee, Ciesla, Ciesla, Cieza, Clayton, Clayton, Desch, Gail, Halliday, Hsu, Inaba, Kitamura, Krot, Krot, Lyons, Matsumura, Merín, Mostefaoui, Nuth, Sakamoto, Shu, Simon, Tachibana, Thrane, Tscharnuter, van Boekel, Vanhala, Yokoyama, Yurimoto   +41 more
core   +1 more source

Chondrule Survivability in the Solar Nebula

The Astrophysical Journal
The lifetime of millimeter-sized dust grains, such as chondrules, in the nominal solar nebula model is limited to ∼10 ^5 yr, due to an inward drift driven by gas drag.
Tetsuo Taki, Shigeru Wakita
doaj   +1 more source

Fullerenes, PAHs, Amino Acids and High Energy Astrophysics

Acta Polytechnica CTU Proceedings, 2014
We present theoretical, observational and laboratory work on the spectral properties of fullerenes and hydrogenated fullerenes. Fullerenes in its various forms (individual, endohedral, hydrogenated, etc.) can contribute to the UV bump in the extinction ...
Susana Iglesias-Groth
doaj   +1 more source

A statistical investigation into relationships between the IIE irons and the ordinary, F and “HH” chondrites

Meteoritics &Planetary Science, Volume 60, Issue 10, Page 2376-2400, October 2025.
Abstract It has been proposed that IIE iron meteorites formed through impact processes on a parent body that was composed of either the H chondrites or a much‐debated fourth ordinary chondrite group, the HH chondrites. To resolve this debate, we have compiled a large dataset for the ordinary chondrites, low‐fayalite ungrouped chondrites, and IIE irons,
Rachel S. Kirby, Penelope L. King, Andrew G. Tomkins   +2 more
wiley   +1 more source

The Physics of Protoplanetesimal Dust Agglomerates. III. Compaction in Multiple Collisions

, 2009
To study the evolution of protoplanetary dust aggregates, we performed experiments with up to 2600 collisions between single, highly-porous dust aggregates and a solid plate.
Andrews, Blum, Carsten Güttler, Cuzzi, Desch, Dominik, Epstein, Frithjof Brauer, Güttler, Hayashi, Heißelmann, Hertz, Johansen, Jürgen Blum, Klahr, Langkowski, Petersen, René Weidling, Reyes-Ruiz, Turner, Weidenschilling, Weidenschilling   +21 more
core   +1 more source

Consequences of the simultaneous formation of giant planets by the core accretion mechanism [PDF]

, 2010
The core accretion mechanism is presently the most widely accepted cause of the formation of giant planets. For simplicity, most models presently assume that the growth of planetary embryos occurs in isolation.
A. Brunini, Adachi, Alibert, Alibert, Balbus, Benvenuto, Bodenheimer, Brunini, Chambers, Dodson-Robinson, Fortier, Fortier, Gammie, Guillot, Haisch, Hasegawa, Hayashi, Hubickyj, Ida, Ida, Inaba, Inaba, Johansen, Kokubo, Kokubo, Kokubo, Kornet, Lissauer, Lodders, Matsumura, Mayer, Militzer, Mizuno, Morbidelli, Mordasini, O. G. Benvenuto, O. M. Guilera, Ohtsuki, Ormel, Pollack, Pringle, Sano, Shakura, Shiraishi, Tanaka, Tanaka, Teiser, Thommes, Tsiganis, Wetherill, Zhou   +50 more
core   +5 more sources

Vertical distribution and kinematics of protoplanetary nebulae in the galaxy [PDF]

Astronomy Letters, 2017
18 pages, 4 figures, 2 ...
Bobylev, V. V., Bajkova, A. T.
openaire   +2 more sources

Löpönvaara: A new phosphorus‐rich iron meteorite from Finland

Meteoritics &Planetary Science, Volume 60, Issue 10, Page 2442-2457, October 2025.
Abstract Löpönvaara is a rare new phosphorus‐rich iron meteorite find from Löpönvaara, Finland. The ~164 g meteorite was discovered in 2017 from the same area as the ungrouped Lieksa pallasite. Löpönvaara was classified as an ungrouped iron meteorite due to its unusually high concentration of P (>4 wt%), coupled with a moderate concentration of Ni (~11 
Laura Kotomaa, Markku Väisänen, Jussi S. Heinonen, Ermei Mäkilä, Hugh O'Brien, Arto Peltola   +5 more
wiley   +1 more source

Composition of Ices in Low-Mass Extrasolar Planets

, 2008
We study the formation conditions of icy planetesimals in protoplanetary disks in order to determine the composition of ices in small and cold extrasolar planets. Assuming that ices are formed from hydrates, clathrates, and pure condensates, we calculate
A. Cassan, D. Ehrenreich, Ehrenfreund P., Hibbitts C. A., Hibbitts C. A., J.‐P. Beaulieu, Kubas D., O. Mousis, Sekine Y., Shakura N. I., U. Marboeuf, V. Wakelam, Walmsley C. M., Watt G. D., Y. Alibert   +14 more
core   +4 more sources