Results 61 to 70 of about 10,677 (209)

When and why formation of large bodies in circumstellar discs could take place?

EPJ Web of Conferences, 2013
We outlined the scenario of the planetary system formation, where large bodies are formed on the stage of massive discs. On this stage the whole of factors: chemical composition, chemical catalytic reactions, the disc self- gravitation, the increased ...
Stadnichenko Olga A., Stoyanovskaya Olga P., Snytnikov Valeriy N.   +2 more
doaj   +1 more source

An alternative origin for debris rings of planetesimals

, 2012
Core Accretion, the most widely accepted scenario for planet formation, postulates existence of km-sized solid bodies, called planetesimals, arranged in a razor-thin disc in the earliest phases of planet formation.
Alibert, Armitage, Aumann, Baruteau, Bernstein, Boley, Boley, Boley, Boss, Boss, Bottke, Cha, Cuzzi, Donnison, Dunham, Forgan, Gingold, Goldreich, Gomes, Helled, Hellyer, Ida, Ida, Ilee, Johansen, Kenyon, Larson, Lucy, Machida, Mayer, McCrea, Michael, Mizuno, Monaghan, Morbidelli, Nayakshin, Nayakshin, Nayakshin, Nayakshin, Nayakshin, Nayakshin, Nayakshin, Nesvorný, Nesvorný, Nesvorný, Nesvorný, Perri, Pollack, Rafikov, Rafikov, Rafikov, Rees, Rice, Safronov, Sergei Nayakshin, Seung-Hoon Cha, Shapiro, Springel, Springel, Stevenson, Stewart, Tanaka, Vorobyov, Vorobyov, Vorobyov, Weidenschilling, Wyatt, Wyatt, Wyatt, Youdin, Youdin, Zubovas, Zuckerman   +72 more
core   +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

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

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

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

Sound Velocity and Grüneisen Parameter in Shock‐Melted Silica at Deep Earth Pressures

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 9, September 2025.
Abstract Silica is a primary component of rocky planet interiors and its melt properties are important for understanding planetary formation and differentiation, magma oceans, and the deep mantle. Although well understood in the solid state, the high‐pressure behavior of liquid silica is poorly constrained at lower mantle pressures.
I. K. Ocampo, J. M. Winey, T. S. Duffy
wiley   +1 more source

A Population Synthesis Study on the Formation of Cold Jupiters from Truncated Planetesimal Disks

The Astrophysical Journal
The occurrence rate of giant planets increases with orbital period and turns over at a location that roughly corresponds to the snowline of solar-type stars.
Kangrou Guo, Masahiro Ogihara, Shigeru Ida, Yasunori Hori, Kaiming Cui, Fabo Feng   +5 more
doaj   +1 more source

Magnesium phosphate in the Cold Bokkeveld (CM2) carbonaceous chondrite

Meteoritics &Planetary Science, Volume 60, Issue 9, Page 2017-2032, September 2025.
Abstract Hydrous Mg‐phosphate was first described from astromaterials in particles returned from the C‐type asteroid Ryugu, and has subsequently been found in samples of the B‐type asteroid Bennu and CI1 carbonaceous chondrites. This phase may have been highly significant as a source of bioessential compounds for early Earth.
Martin R. Lee, Tobias Salge, Ian Maclaren   +2 more
wiley   +1 more source

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