Results 11 to 20 of about 2,944 (214)
Planetesimal Formation by the Gravitational Instability of Dust Ring Structures
The Astrophysical Journal, 2023 We investigate the gravitational instability (GI) of dust ring structures and the formation of planetesimals by their gravitational collapse. The normalized dispersion relation of a self-gravitating ring structure includes two parameters that are related
Sanemichi Z. Takahashi +2 more
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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.
Eiichiro Kokubo, Shigeru Ida
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Ice Sublimation in Planetesimals Formed at the Outward Migrating Snowline
The Astrophysical Journal Letters, 2023 Isotopic studies of meteorites suggest that planetesimals were formed as two distinct populations: noncarbonaceous (NC) and carbonaceous (CC) reservoirs.
Zhongtian Zhang
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Planetesimal Population Synthesis: Pebble Flux-regulated Planetesimal Formation [PDF]
The Astrophysical Journal, 2019 Abstract We propose an expression for a local planetesimal formation rate proportional to the instantaneous radial pebble flux. The result—a radial planetesimal distribution—can be used as an initial condition to study the formation of planetary embryos.
Christian T. Lenz +2 more
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Planetesimal Accretion at Short Orbital Periods
The Astrophysical Journal, 2023 Formation models in which terrestrial bodies grow via the pairwise accretion of planetesimals have been reasonably successful at reproducing the general properties of the Solar System, including small-body populations. However, planetesimal accretion has
Spencer C. Wallace, Thomas R. Quinn
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Binary formation in planetesimal disks. II. Planetesimals with a mass spectrum [PDF]
Publications of the Astronomical Society of Japan, 2014 Abstract Many massive objects have been found in the outer region of the solar system. How they were formed and evolved has not been well understood, although there have been intensive studies of the accretion process of terrestrial planets. One of the mysteries is the existence of binary planetesimals with near-equal mass components and
Junko Kominami, Junichiro Makino
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Frontiers in Earth Science, 2018 Core formation has left a lasting geochemical signature on the Earth. In order to constrain the composition of the Earth we must fully understand the processes by which newly formed Earth, and the bodies which accreted to it, differentiated.
Madeleine T. L. Berg +6 more
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The Astrophysical Journal, 2023 Recent observations suggest that the first stages of planet formation likely take place in the Class 0/I phase of young stellar object evolution, when the star and the disk are still embedded in an infalling envelope.
Wenrui Xu, Philip J. Armitage
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Planet formation in slightly inclined binary systems
EPJ Web of Conferences, 2011 One of the major problems of planet formation in close binary systems, such as α Centauri AB, is the formation of planetary embryos or cores by mutual accretion of km-sized planetesimals.
Ge J., Xie J.-W., Zhou J.-L.
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Binary Formation in Planetesimal Disks. I. Equal Mass Planetesimals [PDF]
Publications of the Astronomical Society of Japan, 2011 As of April 2010, 48 TNO (trans-Neptunian Object) binaries have been found. This is about 6% of known TNOs. However, in previous theoretical studies of planetary formation in the TNO region, the effect of binary formation has been neglected. TNO binaries can be formed through a variety of mechanisms, such as a three-body process, dynamical friction on ...
Junko Kominami +2 more
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