Results 61 to 70 of about 14,974 (190)

Accumulation of Dust on a Surface and the Subsequent Formation of Compact Aggregate Piles

Journal of Geophysical Research: Planets, Volume 130, Issue 10, October 2025.
Abstract Dust aggregation is a prominent topic in space physics, yet the accumulation of dust on surfaces in airless environments remains poorly understood. It is commonly assumed that, during the initial stages of dust deposition, particles spread uniformly to form a monolayer.
G. Griffin, J. Martinez, P. Adamson, L. Matthews, T. W. Hyde   +4 more
wiley   +1 more source

Vega's hot dust from icy planetesimals scattered inward by an outward-migrating planetary system

, 2014
Vega has been shown to host multiple dust populations, including both hot exo-zodiacal dust at sub-AU radii and a cold debris disk extending beyond 100 AU.
Bonsor, Amy, Raymond, Sean N.
core   +3 more sources

Fast Radio Bursts and Interstellar Objects

The Astrophysical Journal
Fast radio bursts (FRBs) are transient radio events with millisecond-scale durations and debated origins. Collisions between planetesimals and neutron stars (NSs) have been proposed as a mechanism to produce FRBs; the planetesimal strength, size, and ...
Dang Pham, Matthew J. Hopkins, Chris Lintott, Michele T. Bannister, Hanno Rein   +4 more
doaj   +1 more source

Massive Protostellar Disks as a Hot Laboratory of Silicate Grain Evolution

The Astrophysical Journal, 2023
Typical accretion disks around massive protostars are hot enough for water ice to sublimate. We here propose to utilize the massive protostellar disks for investigating the collisional evolution of silicate grains with no ice mantle, which is an ...
Ryota Yamamuro, Kei E. I. Tanaka, Satoshi Okuzumi   +2 more
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

Formation of the First Planetesimals via the Streaming Instability in Globally Turbulent Protoplanetary Disks?

The Astrophysical Journal, 2023
Using self-consistent models of turbulent particle growth in an evolving protoplanetary nebula of solar composition, we find that recently proposed local metallicity and Stokes number criteria necessary for the streaming instability to generate ...
Paul R. Estrada, Orkan M. Umurhan
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

Planetesimal formation by the streaming instability in a photoevaporating disk

, 2017
Recent years have seen growing interest in the streaming instability as a candidate mechanism to produce planetesimals. However, these investigations have been limited to small-scale simulations. We now present the results of a global protoplanetary disk
Carrera, Daniel, Davies, Melvyn B., Gorti, Uma, Johansen, Anders   +3 more
core   +1 more source

A Solution for the Density Dichotomy Problem of Kuiper Belt Objects with Multispecies Streaming Instability and Pebble Accretion

The Planetary Science Journal
Kuiper Belt objects (KBOs) show an unexpected trend, whereby large bodies have increasingly higher densities, up to five times greater than their smaller counterparts. Current explanations for this trend assume formation at constant composition, with the
Manuel H. Cañas, Wladimir Lyra, Daniel Carrera, Leonardo Krapp, Debanjan Sengupta, Jacob B. Simon, Orkan M. Umurhan, Chao-Chin Yang, Andrew N. Youdin   +8 more
doaj   +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