Results 41 to 50 of about 505 (181)

Streaming Instability and Turbulence: Conditions for Planetesimal Formation

The Astrophysical Journal
The streaming instability (SI) is a leading candidate for planetesimal formation, which can concentrate solids through two-way aerodynamic interactions with the gas.
Jeonghoon Lim, Jacob B. Simon, Rixin Li, Philip J. Armitage, Daniel Carrera, Wladimir Lyra, David G. Rea, Chao-Chin Yang, Andrew N. Youdin   +8 more
doaj   +1 more source

The missing large impact craters on Ceres

Nature Communications, 2016
Studying craters on atmosphere-less bodies can unlock information about planetesimal histories. Here, Marchi et al. present results from the NASA Dawn mission to Ceres showing that craters >100–150 km in size are largely absent, and find that Ceres ...
S. Marchi, A. I. Ermakov, C. A. Raymond, R. R. Fu, D. P. O’Brien, M. T. Bland, E. Ammannito, M. C. De Sanctis, T. Bowling, P. Schenk, J. E. C. Scully, D. L. Buczkowski, D. A. Williams, H. Hiesinger, C. T. Russell   +14 more
doaj   +1 more source

APPLICATION OF GAS DYNAMICAL FRICTION FOR PLANETESIMALS. II. EVOLUTION OF BINARY PLANETESIMALS [PDF]

The Astrophysical Journal, 2016
ABSTRACT One of the first stages of planet formation is the growth of small planetesimals and their accumulation into large planetesimals and planetary embryos. This early stage occurs long before the dispersal of most of the gas from the protoplanetary disk.
Grishin, Evgeni, Perets, Hagai B.
openaire   +2 more sources

Evolution of Terrestrial Planetary Bodies and Implications for Habitability

Reviews of Geophysics, Volume 63, Issue 4, December 2025.
Abstract The terrestrial planetary bodies of our solar system—Mercury, Venus, Earth, and Mars—share a common origin through nebular accretion and early magma ocean differentiation, yet they diverged significantly in geological evolution, tectonic regimes, and habitability.
Peter A. Cawood, Eva E. Stüeken, Priyadarshi Chowdhury, Chris J. Hawkesworth, Jacob A. Mulder   +4 more
wiley   +1 more source

Formation of Multiple Dynamical Classes in the Kuiper Belt via Disk Dissipation

The Astrophysical Journal
Planetesimal formation likely lasted for millions of years in the solar nebula, and the cold classicals in the Kuiper Belt are suggested to be the direct products of streaming instability.
Tommy Chi Ho Lau, Til Birnstiel, Sebastian M. Stammler, Joanna Drążkowska   +3 more
doaj   +1 more source

Dynamics and accretion of planetesimals [PDF]

Progress of Theoretical and Experimental Physics, 2012
We review the basic dynamics and accretion of planetesimals by showing N-body simulations. The orbits of planetesimals evolve through two-body gravitational relaxation: viscous stirring increases the random velocity and dynamical friction realizes the equiparation of the random energy.
Kokubo, Eiichiro, Ida, Shigeru
openaire   +2 more sources

An Analytical Theory for the Growth from Planetesimals to Planets by Polydisperse Pebble Accretion

The Astrophysical Journal, 2023
Pebble accretion is recognized as a significant accelerator of planet formation. Yet only formulae for single-sized (monodisperse) distribution have been derived in the literature.
Wladimir Lyra, Anders Johansen, Manuel H. Cañas, Chao‐Chin Yang   +3 more
doaj   +1 more source

The effect of pressure on dihedral angle between liquid Fe‐S and orthopyroxene: Implication for percolative core formation in planetesimals and planetary embryos

Meteoritics &Planetary Science, Volume 60, Issue 12, Page 2811-2827, December 2025.
Abstract During precursor stages of planet formation, many planetesimals and planetary embryos are considered to have differentiated, forming an iron‐alloy core and silicate mantle. Percolation of liquid iron‐alloy in solid silicates is one of the major possible differentiation processes in these small bodies.
Takumi Miura, Hidenori Terasaki, Hyu Takaki, Kotaro Kobayashi, Geoffrey David Bromiley, Takashi Yoshino   +5 more
wiley   +1 more source

ELemental abundances of Planets and brown dwarfs Imaged around Stars (ELPIS). I. Potential Metal Enrichment of the Exoplanet AF Lep b and a Novel Retrieval Approach for Cloudy Self-luminous Atmospheres

The Astronomical Journal, 2023
AF Lep A+b is a remarkable planetary system hosting a gas-giant planet that has the lowest dynamical mass among directly imaged exoplanets. We present an in-depth analysis of the atmospheric composition of the star and planet to probe the planet’s ...
Zhoujian Zhang, Paul Mollière, Keith Hawkins, Catherine Manea, Jonathan J. Fortney, Caroline V. Morley, Andrew Skemer, Mark S. Marley, Brendan P. Bowler, Aarynn L. Carter, Kyle Franson, Zachary G. Maas, Christopher Sneden   +12 more
doaj   +1 more source

TWO BEYOND-PRIMITIVE EXTRASOLAR PLANETESIMALS [PDF]

The Astrophysical Journal, 2013
Using the Cosmic Origins Spectrograph onboard the Hubble Space Telescope, we have obtained high-resolution ultraviolet observations of GD 362 and PG 1225-079, two helium-dominated, externally-polluted white dwarfs. We determined or placed useful upper limits on the abundances of two key volatile elements, carbon and sulfur, in both stars; we also ...
Xu, S., Jura, M., Klein, B., Koester, D., Zuckerman, B.   +4 more
openaire   +2 more sources