Dust-gas instabilities in protoplanetary disks : toward understanding planetesimal formation / / Ryosuke Tominaga

• Record Nr.: UNISA996472059803316
• Autore: Tominaga Ryosuke
• Pubbl/distr/stampa: Singapore : , : Springer, , [2022]; ©2022
• ISBN: 9789811917653; 9789811917646
• Descrizione fisica: 1 online resource (125 pages)
• Collana: Springer Theses
• Disciplina: 523.4
• Soggetti: Planets - Origin; Protoplanetary disks
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Nota di contenuto: Intro -- Supervisor's Foreword -- Acknowledgements -- Contents -- 1 Introduction -- 1.1 From Molecular Cloud Cores to Protoplanetary Disks -- 1.2 Dust Dynamics in Protoplanetary Disks -- 1.2.1 Radial Drift and Vertical Sedimentation -- 1.2.2 The Effects of Turbulence on Dust Grains -- 1.2.3 Gravitational Instability of a Dust Layer -- 1.2.4 Secular Gravitational Instability -- 1.3 ALMA Observations of Annular Substructures -- 1.4 Purposes of This Thesis -- References -- 2 Revision of Macroscopic Equations for Dust Diffusion -- 2.1 Short Introduction: Unphysical Momentum Transport Due to the Diffusion Term -- 2.2 Reformulation of Basic Equations from the Mean-Field Approximation -- 2.3 Linear Analyses -- 2.3.1 Basic Equations -- 2.3.2 Linearized Equations -- 2.3.3 Results -- 2.4 Discussion: Effects of Disk Thickness -- 2.5 Summary -- References -- 3 Numerical Simulations of Secular Instabilities -- 3.1 Short Introduction -- 3.2 Numerical Methods -- 3.2.1 Lagrangian-Cell Method -- 3.2.2 The Piecewise Exact Solution for Friction -- 3.2.3 Methods for Turbulent Diffusion and Viscosity -- 3.3 Simulations of Radially Extended Disks -- 3.3.1 Formation of Transient Low-Contrast Dust Rings -- 3.4 Discussion -- 3.4.1 Linear Analyses with Dust Drift -- 3.4.2 Condition for the Thin Dense Ring Formation -- 3.4.3 Fate of Dense Dusty Rings -- 3.4.4 Observational Justification -- 3.4.5 Effects on Dust-to-Gas Ratio Dependence on the ; Dust Coefficient -- 3.5 Summary -- References -- 4 Coagulation Instability: Self-induced Dust Concentration -- 4.1 Short Introduction -- 4.2 Basic Equations for Linear Analyses with Dust Growth -- 4.3 Linear Analyses and Results -- 4.4 Discussion -- 4.4.1 Impact of Dust Diffusion -- 4.4.2 Effects of Other Collision Velocities.; 4.4.3 Coevolution with Other Dust-Gas Instabilities: Bridging a Gap Between First Dust Growth and Hydrodynamical Clumping Toward Planetesimal Formation -- 4.5 Summary -- References -- 5 Summary and Future Prospects -- 5.1 Summary of This Thesis -- 5.2 Future Prospects -- References.