Results 71 to 80 of about 14,974 (190)

Metallicity of the Massive Protoplanets Around HR 8799 If Formed by Gravitational Instability

, 2009
The final composition of giant planets formed as a result of gravitational instability in the disk gas depends on their ability to capture solid material (planetesimals) during their 'pre-collapse' stage, when they are extended and cold, and contracting ...
Alexander, Bodenheimer, Boley, Boss, Boss, Cameron, Cuzzi, Decampli, Dodson-Robinson, Durisen, Greenzweig, Guillot, Haghighipour, Helled, Helled, Helled, Henyey, Hubickyj, Ida, Johansen, Kalas, Klahr, Mamatsashvili, Marley, Marois, Mayer, Mayer, Mayer, Morbidelli, P. Bodenheimer, Pollack, Pollack, R. Helled, Rafikov, Rice, Saumon   +35 more
core   +1 more source

Effects of Planetesimal Scattering: Explaining the Observed Offsets from Period Ratios 3:2 and 2:1

The Astrophysical Journal, 2023
The observed deficit and excess of adjacent planet pairs with period ratios narrow and wide of 3:2 and 2:1, the nominal values for the corresponding mean-motion resonances (MMRs), have intrigued many. Previously, using a suite of simulations, Chatterjee &
Tuhin Ghosh, Sourav Chatterjee
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

Coagulation Calculations of Icy Planet Formation at 15--150 AU: A Correlation Between the Maximum Radius and the Slope of the Size Distribution for Transneptunian Objects

, 2012
We investigate whether coagulation models of planet formation can explain the observed size distributions of transneptunian objects (TNOs). Analyzing published and new calculations, we demonstrate robust relations between the size of the largest object ...
Alibert, Andrews, Batygin, Batygin, Benjamin C. Bromley, Bernstein, Bianco, Bianco, Bromley, Bromley, Bromley, Buie, Currie, Davis, Fraser, Fraser, Fraser, Fuentes, Fuentes, Fuentes, Gladman, Hahn, Haisch, Hartmann, Ida, Jedicke, Jewitt, Kennedy, Kennedy, Kenyon, Kenyon, Kenyon, Kenyon, Kenyon, Kenyon, Kenyon, Kenyon, Kenyon, Kenyon, Kenyon, Kenyon, Kenyon, Kenyon, Leinhardt, Levison, Levison, Mamajek, Morbidelli, Murray-Clay, Nesvorný, O'Brien, Pan, Peixinho, Petit, Petit, Rafikov, Safronov, Schlichting, Schwamb, Scott J. Kenyon, Sheppard, Sheppard, Stansberry, Stern, Trujillo, Weidenschilling, Wolff   +66 more
core   +1 more source

Evidence for late impact‐induced metasomatism on the brachinite parent body recorded by a phosphate assemblage in NWA 7828

Meteoritics &Planetary Science, Volume 60, Issue 9, Page 2099-2113, September 2025.
Abstract Brachinites are a group of ultramafic achondritic meteorites thought to sample a planetesimal from the early inner solar system. They yield predominately ancient crystallization ages within 4 Ma of CAI formation, and while the formation mechanism for these samples is debated, they are widely thought to be partial melt residues from a ...
L. F. White, B. G. Rider‐Stokes, M. Anand, R. Tartèse, J. R. Darling, G. Degli Alessendrini, R. Greenwood, K. T. Tait   +7 more
wiley   +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

Olivine fabric and microstructure in Northwest Africa (NWA) 7059 and Nova 018: Insights into ureilite deformation

Meteoritics &Planetary Science, Volume 60, Issue 9, Page 2166-2183, September 2025.
Abstract Olivine is a major constituent in ureilites and commonly defines macroscopic fabric via shape‐preferred orientation of elongate grains. In this study, we examined olivine fabric (crystallographic preferred orientation, or CPO) and microstructures in the unbrecciated olivine‐pigeonite ureilites Northwest Africa (NWA) 7059 and Nova 018 using ...
A. I. Sheen, C. K. F. Tirona, K. T. Tait, L. F. White, B. C. Hyde, S. Korchinos   +5 more
wiley   +1 more source

Origin of the CC-NC isotopic dichotomy in early planetesimals (iron meteorite parent bodies) [PDF]

, 2022
Alessandro Morbidelli, Kévin Baillié, Konstantin Batygin, S. Charnoz, T. Guillot, D. C. Rubie, T. Kleine   +6 more
openalex   +1 more source

Constraints on the Feasibility of Ferrovolcanism on Asteroid 16 Psyche

Journal of Geophysical Research: Planets, Volume 130, Issue 8, August 2025.
Abstract Asteroid 16 Psyche's surface appears to be highly metallic, but its bulk density suggests a silicate‐rich interior. Ferrovolcanism has been suggested to explain how a silicate‐rich body could develop a metallic surface. This requires trapping of light elements bearing iron‐rich metallic melt in a core solidifying from the outside inwards.
J. J. Jorritsma, W. van Westrenen
wiley   +1 more source

The Bulk Densities of Small Solar System Bodies as a Probe of Planetesimal Formation

The Astrophysical Journal
Constraining the formation processes of small solar system bodies is crucial for gaining insights into planetesimal formation. Their bulk densities, determined by their compressive strengths, offer valuable information about their formation history.
Misako Tatsuuma, Akimasa Kataoka, Hidekazu Tanaka, Tristan Guillot   +3 more
doaj   +1 more source