Results 41 to 50 of about 77,477 (148)

Polymict melt‐bearing breccia dikes in the Morokweng impact structure formed by slip‐induced mechanical mixing of pseudotachylite and cataclasite along large‐displacement impact faults

Meteoritics &Planetary Science, EarlyView.
Abstract A core drilled through shocked and faulted Archean granitoid gneisses and dolerites in the eroded peak ring of the 70–80 km diameter Morokweng impact structure intersects multiple centimeter‐ to meter‐wide clastic‐matrix breccias containing a polymict clast population of lithic and mineral clasts and altered, millimeter‐ to centimeter ‐size ...
Roger L. Gibson, S'lindile S. Wela, Leonidas C. Vonopartis, Marco A. G. Andreoli   +3 more
wiley   +1 more source

Filament Formation due to Diffusive Instabilities in Dusty Protoplanetary Disks

The Astrophysical Journal
We report the finding of a new, local diffusion instability in a protoplanetary disk which can operate in a dust fluid, subject to mass diffusion, shear viscosity, and dust–gas drag, provided the diffusivity, viscosity, or both, decrease sufficiently ...
Konstantin Gerbig, Min-Kai Lin, Marius Lehmann   +2 more
doaj   +1 more source

Ray-tracing Simulations and Spectral Models of X-Ray Radiation in Dusty Media

The Astrophysical Journal, 2023
Dust can play an important role in shaping the X-ray spectra and images of astrophysical sources. In this work we report on the implementation of dust in the ray-tracing platform RefleX .
Claudio Ricci, Stéphane Paltani
doaj   +1 more source

Effects of Ringed Structures and Dust Size Growth on Millimeter Observations of Protoplanetary Disks [PDF]

Astrophysical Journal, 2019
The growth of solids from submicron to millimeter and centimeter sizes is the early step toward the formation of planets inside protoplanetary disks (PPDs).
Ya-Ping 平 Li 李亚, H. Li 李, L. Ricci, Shengtai 台 Li 李胜, T. Birnstiel, A. Isella, M. Ansdell, F. Yuan 袁, J. Dra̧żkowska, S. Stammler   +9 more
semanticscholar   +1 more source

Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure

Meteoritics &Planetary Science, EarlyView.
Abstract Hummeln is a simple impact structure located in south‐eastern Sweden. It is approximately 1.2 km in diameter and almost completely covered by a lake. Here, we present the first detailed investigation of impactites and mapping of the 164.25 m deep drill core Hummeln‐1 with a focus on impact metamorphism and the impact process.
S. Alwmark, J. Granbom, P. Ahlberg, M. Calner, S. Richoz, K. J. Gajewska, W. R. Hyde, K. Ljung, C. Alwmark   +8 more
wiley   +1 more source

Diffusive Instabilities in Dusty Disks: Linear Growth and Nonlinear Breakdown

The Astrophysical Journal
We revisit the diffusive instability in dusty disks that arises when the dust mass diffusivity and/or viscosity decrease sufficiently steeply with increasing dust density. Our updated model includes an incompressible viscous gas that responds azimuthally
Konstantin Gerbig, Min-Kai Lin
doaj   +1 more source

A Catalog of 71 Coronal Line Galaxies in MaNGA: [Ne v] Is an Effective AGN Tracer

The Astrophysical Journal, 2023
Despite the importance of active galactic nuclei (AGNs) in galaxy evolution, accurate AGN identification is often challenging, as common AGN diagnostics can be confused by contributions from star formation and other effects (e.g., Baldwin–Phillips ...
James Negus, Julia M. Comerford, Francisco Müller Sánchez, Mitchell Revalski, Rogemar A. Riffel, Kevin Bundy, Rebecca Nevin, Sandro B. Rembold   +7 more
doaj   +1 more source

Geochemical investigation of impactites from the Boltysh impact structure and possible relationship to early Danian sediments from the Umbria–Marche Basin, Italy

Meteoritics &Planetary Science, EarlyView.
Abstract Within the Danian Scaglia Rossa Formation appears a regionally correlatable horizon cutting across multiple sections and outcrops within the Umbria–Marche Basin of NE Italy, where it is intercalated with uniform pelagic carbonate successions. This horizon is called “ALE layer” and has tentatively been interpreted as a fine‐grained volcanic ash.
Toni Schulz, Sophia Wernitznig, Christian Koeberl, Bérengère Mougel, Alessandro Montanari, Frédéric Moynier   +5 more
wiley   +1 more source

General Implicit Runge–Kutta Integrators for Multifluid Gas–Dust Aerodynamic Drag

The Astrophysical Journal
The integration of aerodynamic drag is a fundamental step in simulating dust dynamics in hydrodynamical simulations. We propose a novel integration scheme, designed to be compatible with Strang splitting techniques, which allows for the straightforward ...
Giovanni Tedeschi-Prades, Til Birnstiel, Klaus Dolag, Barbara Ercolano, Mark Hutchison   +4 more
doaj   +1 more source

Dust dynamic pressure and magnetopause displacement: reasons for non-detection [PDF]

Annales Geophysicae, 2013
In a recent paper, Treumann and Baumjohann (2011) propose that the contribution of dust particles to the solar wind dynamic pressure can cause large compressions of the Earth's magnetopause and suggest that this occurs when Earth encounters ...
I. Mann, M. Hamrin
doaj   +1 more source