Results 71 to 80 of about 2,944 (214)

Comets and Planetesimal Formation

, 2022
In this chapter, we review the processes involved in the formation of planetesimals and comets. We will start with a description of the physics of dust grain growth and how this is mediated by gas-dust interactions in planet-forming disks. We will then delve into the various models of planetesimal formation, describing how these planetesimals form as ...
Simon, Jacob B., Blum, Jürgen, Birnstiel, Til, Nesvorný, David   +3 more
openaire   +2 more sources

Recent Advances in the Compositional and Mapping Analysis of Iron Meteorites Using a Handheld Laser‐Induced Breakdown Spectroscopy Instrument

Geostandards and Geoanalytical Research, Volume 48, Issue 4, Page 837-862, December 2024.
Key points Methodological protocol for field‐based handheld LIBS for qualitative and quantitative analysis of iron meteorites. Good agreement was achieved between handheld LIBS measurement results and reference data for Fe, Ni, Co, and Cu. Handheld LIBS can achieve preliminary chemical identification and classification of iron meteorites including ...
Giorgio S. Senesi, Olga De Pascale, Sara Mattiello, Vanni Moggi Cecchi, Abderrahmane Ibhi, Lahcen Ouknine, Hassan Nachit   +6 more
wiley   +1 more source

Dust Coagulation Assisted by Streaming Instability in Protoplanetary Disks

The Astrophysical Journal
The streaming instability is a promising mechanism for planetesimal formation. The instability can rapidly form dense clumps that collapse self-gravitationally, which is efficient for large dust grains with Stokes number of the order of 0.1.
Ryosuke T. Tominaga, Hidekazu Tanaka
doaj   +1 more source

Radial transport and nebular thermal processing of millimeter‐sized solids in the Solar protoplanetary disk inferred from Cr‐Ti‐O isotope systematics of chondrules

Meteoritics &Planetary Science, Volume 59, Issue 12, Page 3282-3304, December 2024.
Abstract Understanding the material transport and mixing processes in the Solar protoplanetary disk provides important constraints on the origin of chemical and isotopic diversities of our planets. The limited extent of radial transport and mixing between the inner and outer Solar System has been suggested based on a fundamental isotopic dichotomy ...
Kohei Fukuda, Yuki Hibiya, Craig R. Kastelle, Katsuhiko Suzuki, Tsuyoshi Iizuka, Katsuyuki Yamashita, Thomas E. Helser, Noriko T. Kita   +7 more
wiley   +1 more source

Selective Aggregation Experiments on Planetesimal Formation and Mercury-Like Planets

Geosciences, 2018
Much of a planet’s composition could be determined right at the onset of formation. Laboratory experiments can constrain these early steps. This includes static tensile strength measurements or collisions carried out under Earth’s gravity and
Gerhard Wurm
doaj   +1 more source

Planetesimal Disk Evolution Driven by Embryo-Planetesimal Gravitational Scattering

The Astronomical Journal, 2003
40 pages, 9 figures, submitted to ...
openaire   +3 more sources

A Critical Core Size for Dynamo Action at the Galilean Satellites

Geophysical Research Letters, Volume 51, Issue 22, 28 November 2024.
Abstract Ganymede is the only known moon with an active dynamo. No mission has discovered intrinsic magnetism at the other Galilean satellites: Io, Europa, and Callisto. A dynamo requires a large magnetic Reynolds number, which in turn demands, for these moons, a large metallic core that is cooling fast enough for convection.
K. T. Trinh, C. J. Bierson, J. G. O’Rourke   +2 more
wiley   +1 more source

Did a Complex Carbon Cycle Operate in the Inner Solar System?

Life, 2020
Solids in the interstellar medium consist of an intimate mixture of silicate and carbonaceous grains. Because 99% of silicates in meteorites were reprocessed at high temperatures in the inner regions of the Solar Nebula, we propose that similar levels of
Joseph A. Nuth, Frank T. Ferguson, Hugh G. M. Hill, Natasha M. Johnson   +3 more
doaj   +1 more source

The Influence of Rotation on the Preservation of Heterogeneities in Magma Oceans

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 11, November 2024.
Abstract Understanding the composition of lavas erupted at the surface of the Earth is key to reconstruct the long‐term history of our planet. Recent geochemical analyses of ocean island basalt samples indicate the preservation of ancient mantle heterogeneities dating from the earliest stages of Earth's evolution (Péron & Moreira, 2018, https://doi.org/
B. Thomas, H. Samuel, C. G. Farnetani, J. Aubert, C. Chauvel   +4 more
wiley   +1 more source

Streaming Instabilities in Accreting Protoplanetary Disks: A Parameter Study

The Astrophysical Journal
The streaming instability (SI) is currently the leading candidate for triggering planetesimal formation in protoplanetary disks. Recently, a novel variation, the “azimuthal-drift” streaming instability (AdSI), was discovered in disks exhibiting laminar ...
Shiang-Chih Wang, Min-Kai Lin
doaj   +1 more source