Matches in SemOpenAlex for { <https://semopenalex.org/work/W2028423787> ?p ?o ?g. }
Showing items 1 to 76 of
76
with 100 items per page.
- W2028423787 endingPage "351" @default.
- W2028423787 startingPage "351" @default.
- W2028423787 abstract "view Abstract Citations (58) References (43) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Evolution of Planetesimals. II. Numerical Simulations Aarseth, S. J. ; Lin, D. N. C. ; Palmer, P. L. Abstract We continue our investigation of the dynamical evolution and coagulation process of planetesimals With a numerical N-body scheme, we simulate gravitational scattering and physical collisions among a system of planetesimals. The results of these simulations confirm our earlier analytical results that dynamical equilibrium is attained with a velocity dispersion comparable to the surface escape velocity of those planetesimals which contribute most of the system mass. In such an equilibrium, the rate of energy transfer from the systematic shear to dispersive motion, induced by gravitational scattering, is balanced by the rate of energy dissipation resulting from physical collisions. We also confirm that dynamical friction can lead to energy equipartition between an abundant population of low-mass field planetesimals and a few collisionally induced mergers with larger masses. These effects produce mass segregation in phase space and runaway coagulation. Collisions also lead to coagulation and evolution of the mass spectrum. The mergers of two field planetesimals can provide sufficient mass differential with other planetesimals for dynamical friction to induce energy equipartition and mass segregation. For small velocity dispersions, the more massive planetesimals produce relatively large gravitational focusing factors. Consequently, the growth time scale decreases with mass and runaway coagulation is initiated. Our numerical simulations show that, provided there is sufficient supply of low-mass planetesimals, runaway coagulation can lead to the formation of protoplanetary cores with masses comparable to a significant fraction of an Earth mass. We estimate that, at 1 AU, the characteristic time scale for the initial stages of planetesimal growth is ∼104 yr and ∼105 yr for the growth to protoplanetary cores. At Jupiter's present distance, these time scales are an order of magnitude longer. Publication: The Astrophysical Journal Pub Date: January 1993 DOI: 10.1086/172208 Bibcode: 1993ApJ...403..351A Keywords: PLANETS; PLANETESIMALS; SOLAR SYSTEM; PLANETARY SYSTEMS; DISTANCE; ORIGIN; FORMATION; NUMERICAL METHODS; SIMULATION; DYNAMICS; EVOLUTION; COAGULATION; GRAVITY EFFECTS; SCATTERING; COLLISIONS; VELOCITY; ENERGY; EQUILIBRIUM; FRICTION; MASS; ACCRETION; TIMESCALE; THEORETICAL STUDIES; CALCULATIONS; PROCEDURE; PARAMETERS; MODEL; BOUNDARIES; SOLAR SYSTEM: FORMATION; STARS: PLANETARY SYSTEMS; Planets full text sources ADS | Related Materials (1) Part 1: 1993ApJ...403..336P" @default.
- W2028423787 created "2016-06-24" @default.
- W2028423787 creator A5024380351 @default.
- W2028423787 creator A5052377212 @default.
- W2028423787 creator A5054612552 @default.
- W2028423787 date "1993-01-01" @default.
- W2028423787 modified "2023-10-01" @default.
- W2028423787 title "Evolution of Planetesimals. II. Numerical Simulations" @default.
- W2028423787 doi "https://doi.org/10.1086/172208" @default.
- W2028423787 hasPublicationYear "1993" @default.
- W2028423787 type Work @default.
- W2028423787 sameAs 2028423787 @default.
- W2028423787 citedByCount "48" @default.
- W2028423787 countsByYear W20284237872012 @default.
- W2028423787 countsByYear W20284237872013 @default.
- W2028423787 countsByYear W20284237872014 @default.
- W2028423787 countsByYear W20284237872015 @default.
- W2028423787 countsByYear W20284237872017 @default.
- W2028423787 countsByYear W20284237872018 @default.
- W2028423787 countsByYear W20284237872020 @default.
- W2028423787 countsByYear W20284237872021 @default.
- W2028423787 countsByYear W20284237872023 @default.
- W2028423787 crossrefType "journal-article" @default.
- W2028423787 hasAuthorship W2028423787A5024380351 @default.
- W2028423787 hasAuthorship W2028423787A5052377212 @default.
- W2028423787 hasAuthorship W2028423787A5054612552 @default.
- W2028423787 hasConcept C115260700 @default.
- W2028423787 hasConcept C118396296 @default.
- W2028423787 hasConcept C121332964 @default.
- W2028423787 hasConcept C127529279 @default.
- W2028423787 hasConcept C12853656 @default.
- W2028423787 hasConcept C2780909310 @default.
- W2028423787 hasConcept C3038340 @default.
- W2028423787 hasConcept C44870925 @default.
- W2028423787 hasConcept C51244244 @default.
- W2028423787 hasConcept C57879066 @default.
- W2028423787 hasConcept C62520636 @default.
- W2028423787 hasConcept C74650414 @default.
- W2028423787 hasConcept C75876914 @default.
- W2028423787 hasConcept C98444146 @default.
- W2028423787 hasConcept C99742106 @default.
- W2028423787 hasConceptScore W2028423787C115260700 @default.
- W2028423787 hasConceptScore W2028423787C118396296 @default.
- W2028423787 hasConceptScore W2028423787C121332964 @default.
- W2028423787 hasConceptScore W2028423787C127529279 @default.
- W2028423787 hasConceptScore W2028423787C12853656 @default.
- W2028423787 hasConceptScore W2028423787C2780909310 @default.
- W2028423787 hasConceptScore W2028423787C3038340 @default.
- W2028423787 hasConceptScore W2028423787C44870925 @default.
- W2028423787 hasConceptScore W2028423787C51244244 @default.
- W2028423787 hasConceptScore W2028423787C57879066 @default.
- W2028423787 hasConceptScore W2028423787C62520636 @default.
- W2028423787 hasConceptScore W2028423787C74650414 @default.
- W2028423787 hasConceptScore W2028423787C75876914 @default.
- W2028423787 hasConceptScore W2028423787C98444146 @default.
- W2028423787 hasConceptScore W2028423787C99742106 @default.
- W2028423787 hasLocation W20284237871 @default.
- W2028423787 hasOpenAccess W2028423787 @default.
- W2028423787 hasPrimaryLocation W20284237871 @default.
- W2028423787 hasRelatedWork W1514744699 @default.
- W2028423787 hasRelatedWork W1973892559 @default.
- W2028423787 hasRelatedWork W2028423787 @default.
- W2028423787 hasRelatedWork W2044303127 @default.
- W2028423787 hasRelatedWork W2075340393 @default.
- W2028423787 hasRelatedWork W2081294382 @default.
- W2028423787 hasRelatedWork W2101436009 @default.
- W2028423787 hasRelatedWork W3019747321 @default.
- W2028423787 hasRelatedWork W3099474433 @default.
- W2028423787 hasRelatedWork W3103114574 @default.
- W2028423787 hasVolume "403" @default.
- W2028423787 isParatext "false" @default.
- W2028423787 isRetracted "false" @default.
- W2028423787 magId "2028423787" @default.
- W2028423787 workType "article" @default.