Results 71 to 80 of about 505 (181)
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
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The Multifaceted Planetesimal Formation Process [PDF]
, 2014 Accumulation of dust and ice particles into planetesimals is an important step in the planet formation process. Planetesimals are the seeds of both terrestrial planets and the solid cores of gas and ice giants forming by core accretion. Left-over planetesimals in the form of asteroids, trans-Neptunian objects and comets provide a unique record of the ...
Johansen, Anders +5 more
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Streaming Instabilities in Accreting Protoplanetary Disks: A Parameter Study
The Astrophysical JournalThe 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
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Fast Radio Bursts and Interstellar Objects
The Astrophysical JournalFast 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 +4 more
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Evading the dust fragmentation barrier with the streaming instability in protoplanetary disks
Astronomy & AstrophysicsContext. The streaming instability (SI) is a leading candidate for reaching solid densities sufficient to trigger the gravitational collapse needed for the formation of planetesimals. However, dust growth barriers appear to impede the ability to assemble
Vallucci-Goy V. +3 more
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Planetesimal Drift in Eccentric Disks: Possible Outward Migration
The Astrophysical JournalRadial drift of solid particles in the protoplanetary disk is often invoked as a threat to planet formation, as it removes solid material from the disk before it can be assembled into planets.
Kedron Silsbee
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Chondrule Survivability in the Solar Nebula
The Astrophysical JournalThe lifetime of millimeter-sized dust grains, such as chondrules, in the nominal solar nebula model is limited to ∼10 ^5 yr, due to an inward drift driven by gas drag.
Tetsuo Taki, Shigeru Wakita
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Vom Staubkorn zum Planetesimal [PDF]
Physik in unserer Zeit, 2019 ZusammenfassungDurch astronomische Beobachtungen, numerische Simulationen und Laborexperimente sind wir erstmals in der Lage, ein in sich geschlossenes Bild der Entstehung der ersten größeren Körper in jungen Planetensystemen zu zeichnen. Mikroskopisch kleine Staubpartikel verklumpen durch haftende Stöße zu millimeter‐ bis zentimetergroßen Agglomeraten.
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Planetesimal Scattering Efficiency of Cold Giant Planet Architectures
The Astronomical JournalThe discovery of many exoplanets has revealed an incredible diversity of orbital architectures. These orbital configurations are intrinsically linked to the potential for habitable environments within the system, since the gravitational influence of the ...
Stephen R. Kane, Emma L. Miles
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Numerical modeling of gravitational instability outcomes in multiphase circumstellar discs
EPJ Web of Conferences, 2013 To suggest consistent route toward planetesimal and planetary core formation in circumstellar discs we study gravitational instability outcomes in massive multiphase (gas-collisionless bodies) disc.
Snytnikov Valeriy N. +1 more
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