منابع مشابه
Gravoturbulent Formation of Planetesimals
We explore the effect of magnetorotational turbulence on the dynamics and concentrations of boulders in local box simulations of a sub-Keplerian protoplanetary disc. The solids are treated as particles each with an independent space coordinate and velocity. We find that the turbulence has two effects on the solids. 1) Meter and decameter bodies are strongly concentrated, locally up to a factor ...
متن کاملCollisions of inhomogeneous pre-planetesimals
Context. In the framework of the coagulation scenario, kilometre-sized planetesimals form by subsequent collisions of preplanetesimals of sizes from centimetre to hundreds of metres. Pre-planetesimals are fluffy, porous dust aggregates, which are inhomogeneous owing to their collisional history. Planetesimal growth can be prevented by catastrophic disruption in pre-planetesimal collisions above...
متن کاملDynamical Evolution of Planetesimals in Protoplanetary Disks
The current picture of terrestrial planet formation relies heavily on our understanding of the dynamical evolution of planetesimals — asteroid-like bodies thought to be planetary building blocks. In this study we investigate the growth of eccentricities and inclinations of planetesimals in spatially homogeneous protoplanetary disks using methods of kinetic theory. Emphasis is put on clarifying ...
متن کاملObstacles to the Collisional Growth of Planetesimals
The debate over whether kilometer-sized solids, or planetesimals, assemble by collision-induced chemical sticking or by gravity-driven unstable modes remains unsettled. In light of recent work showing that gravitational growth can occur despite turbulent stirring, we critically evaluate the collisional hypothesis. Impact speeds in protoplanetary disks reach ∼ 50 m/s in a laminar disk and may be...
متن کاملFluid migration on early-accreting planetesimals
Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online's data policy on reuse of materials please consult the policies page. Introduction: The parent bodies of primitive meteorites and asteroids of the outer main belt accreted with a significant complement of volatiles such as H ...
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ژورنال
عنوان ژورنال: Nature
سال: 2017
ISSN: 0028-0836,1476-4687
DOI: 10.1038/549461a