Dynamics and accretion of planetesimals

被引:31
|
作者
Kokubo, Eiichiro [1 ]
Ida, Shigeru [2 ]
机构
[1] Natl Astron Observ Japan, Div Theoret Astron, Mitaka, Tokyo 1818588, Japan
[2] Tokyo Inst Technol, Dept Earth & Planetary Sci, Meguro Ku, Tokyo 1528551, Japan
来源
关键词
ISOTHERMAL GASEOUS DISK; TERRESTRIAL PLANETS; GIANT PLANETS; 3-DIMENSIONAL INTERACTION; PROTOPLANETS; SOLAR; SCATTERING; EVOLUTION; GROWTH; MASS;
D O I
10.1093/ptep/pts032
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
In the standard scenario of planet formation, planets are formed from a protoplanetary disk that consists of gas and dust. The building blocks of solid planets are called planetesimals; they are formed by coagulation of dust. 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. In the early stage of planetesimal accretion, the growth mode of planetesimals is runaway growth, where larger planetesimals grow faster than smaller ones. When a protoplanet (a runaway-growing planetesimal) exceeds a critical mass, the growth mode shifts to oligarchic growth, where similar-sized protoplanets grow while keeping a certain orbital separation. The final stage of terrestrial planet formation is collision among protoplanets, known as giant impacts. We also summarize the dynamical effects of disk gas on planets and the core accretion model for the formation of gas giants, and discuss the diversity of planetary systems.
引用
收藏
页数:23
相关论文
共 50 条
  • [41] High-velocity dust collisions: forming planetesimals in a fragmentation cascade with final accretion
    Teiser, Jens
    Wurm, Gerhard
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2009, 393 (04) : 1584 - 1594
  • [42] ON THE ORIGIN OF THE PLANETARY SPIN BY ACCRETION OF PLANETESIMALS .2. COLLISIONAL ORBITS AT THE HILL SURFACE
    TANIKAWA, K
    KIKUCHI, N
    SATO, I
    [J]. ICARUS, 1991, 94 (01) : 112 - 125
  • [43] On the dynamics and collisional growth of planetesimals in misaligned binary systems
    Fragner, M. M.
    Nelson, R. P.
    Kley, W.
    [J]. ASTRONOMY & ASTROPHYSICS, 2011, 528
  • [44] ON THE ORIGIN OF THE PLANETARY SPIN ANGULAR-MOMENTUM BY ACCRETION OF PLANETESIMALS - PROPERTY OF COLLISION ORBITS
    TANIKAWA, K
    MANABE, S
    BROUCKE, R
    [J]. ICARUS, 1989, 79 (01) : 208 - 222
  • [45] CAPTURE PROBABILITY OF COLLIDING PLANETESIMALS - DYNAMICAL CONSTRAINTS ON ACCRETION OF PLANETS, SATELLITES, AND RING PARTICLES
    OHTSUKI, K
    [J]. ICARUS, 1993, 106 (01) : 228 - 246
  • [46] A close-encounter method for simulating the dynamics of planetesimals
    Lorek, Sebastian
    Johansen, Anders
    [J]. ASTRONOMY & ASTROPHYSICS, 2020, 644 (644)
  • [47] Dynamics of core accretion
    Nelson, Andrew F.
    Ruffert, Maximilian
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2013, 429 (02) : 1791 - 1826
  • [48] STATISTICAL DYNAMICS AND ACCRETION
    DANBY, JMA
    CAMM, GL
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1957, 117 (01) : 50 - 71
  • [49] Dynamics of continental accretion
    Moresi, L.
    Betts, P. G.
    Miller, M. S.
    Cayley, R. A.
    [J]. NATURE, 2014, 508 (7495) : 245 - +
  • [50] Dynamics of core accretion
    Nelson, AF
    Ruffert, MO
    [J]. Extrasolar Planets: Today and Tomorrow, 2004, 321 : 341 - 342