Download presentation
Presentation is loading. Please wait.
Published byGwen Chandler Modified over 9 years ago
1
Neal Turner Jet Propulsion Laboratory, California Institute of Technology Protostellar Disks: Birth, Life and Death National Aeronautics and Space Administration
2
The Life of Protostellar Disks 1.Jets and Winds 2.Basic disk properties 3.Angular momentum transport 4.Evolution of the solids National Aeronautics and Space Administration
4
Hartigan et al. 1995 / Antoniucci et al. 2008 National Aeronautics and Space Administration
5
McKee & Ostriker 2007 National Aeronautics and Space Administration
6
Pyo et al. 2005 National Aeronautics and Space Administration
7
Zinnecker et al. 1998 National Aeronautics and Space Administration
8
Takami et al. 2001 National Aeronautics and Space Administration
9
Burrows et al. 1996 National Aeronautics and Space Administration
10
C. Lada 1985 National Aeronautics and Space Administration
11
Girart et al. 2006 National Aeronautics and Space Administration
12
Tamura et al. 1999 National Aeronautics and Space Administration
13
T. Ray et al. 1997 National Aeronautics and Space Administration
14
Johns-Krull 2007 National Aeronautics and Space Administration
15
Ferreira et al. 2006 National Aeronautics and Space Administration
16
Spruit 1996 National Aeronautics and Space Administration
17
Anderson et al. 2003 Size of the Launching Region? Jet power= Rate of work done against the magnetic torque = (Footpoint orbital frequency) x (Angular momentum flux): Infer launching region lies 0.3 to 4 AU from the star. Assumes energy and momentum conserved along streamlines. National Aeronautics and Space Administration
18
Y. Kato 2004 National Aeronautics and Space Administration
19
Nakamura & Li 2007 Outflow-Driven Turbulence 1 National Aeronautics and Space Administration
20
Outflow-Driven Turbulence 2 Cloud kinetic energy v T 2 dissipates on a crossing time R/v T, so the outflows can provide the stirring if With R=10 pc, v T =10 km s -1, f=0.01, v J =300 km s -1 and jet mass flow rate 10 -7 Solar masses per year, the outflows are sufficient to power the turbulence. i.e., if the outflow kinetic luminosity is greater than the dissipation rate in the gas associated with the star. National Aeronautics and Space Administration
21
Basic Disk Properties National Aeronautics and Space Administration
22
Hartmann & Kenyon 1996 National Aeronautics and Space Administration
23
M. Simon et al. 2000 National Aeronautics and Space Administration
24
Andrews & Williams 2007 National Aeronautics and Space Administration
25
Andrews & Williams 2007 National Aeronautics and Space Administration
26
Origins of the Surface Density Profile In steady-state Shakura-Sunyaev -disk, if irradiation controls the temperature profile. National Aeronautics and Space Administration
27
Weidenschilling 1977 National Aeronautics and Space Administration
28
Dullemond et al. 2007 National Aeronautics and Space Administration
29
Dullemond et al. 2007 National Aeronautics and Space Administration
30
Dullemond et al. 2007 National Aeronautics and Space Administration
31
Bergin et al. 2007 National Aeronautics and Space Administration
32
K. R. Bell et al. 1995 National Aeronautics and Space Administration
33
Hartmann et al. 1993 National Aeronautics and Space Administration
34
Angular Momentum Transport National Aeronautics and Space Administration
35
1. Gravitational Instability National Aeronautics and Space Administration
36
1. Gravitational Instability National Aeronautics and Space Administration
37
Small disturbances grow if National Aeronautics and Space Administration
38
Gammie 2001 National Aeronautics and Space Administration
39
Gammie 2001 National Aeronautics and Space Administration
40
Mejia et al. 2005 With slower cooling, instability leads to sustained accretion. National Aeronautics and Space Administration
41
Balbus & Hawley 1991 2. Magneto-Rotational Turbulence National Aeronautics and Space Administration
42
Balbus & Hawley 1991 2. Magneto-Rotational Turbulence National Aeronautics and Space Administration
44
Gammie 1996 National Aeronautics and Space Administration
45
Three Ways to Lose Magnetic Flux National Aeronautics and Space Administration
46
Ionization Processes Stellar X-Rays Interstellar Cosmic Rays Long-Lived Radionuclides At 1 AU in the minimum mass Solar nebula Midplane ionisation is weak! Short-Lived Radionuclides National Aeronautics and Space Administration
47
Wardle 2007 National Aeronautics and Space Administration
48
Sano & Stone 2002b MRI turbulence requires National Aeronautics and Space Administration
49
1 m Grains National Aeronautics and Space Administration
50
No Grains National Aeronautics and Space Administration
51
H. Li et al. 2001 P National Aeronautics and Space Administration
52
Lodato & Clarke 2004 National Aeronautics and Space Administration
53
Evolution of the Solids National Aeronautics and Space Administration
54
van Boekel et al. 2004 National Aeronautics and Space Administration
55
van Boekel et al. 2004 National Aeronautics and Space Administration
56
TEM image of a thin- sectioned Wild 2 grain consisting of enstatite with exsolution lamellae of diopside, formed from a melt (H. Leroux) National Aeronautics and Space Administration
57
Natta et al. 2007 Resolved Unresolved National Aeronautics and Space Administration
58
Furlan et al. 2006 National Aeronautics and Space Administration
59
Dahm & Hillenbrand 2007 National Aeronautics and Space Administration
60
Dullemond & Dominik 2004 Settling is rapid in a laminar disk National Aeronautics and Space Administration
61
A Rough Estimate of Grain Growth Timescales Particles settle at the terminal speed, with the force of gravity balancing the force of the gas molecules striking from below: Particles remain compact spheres. Particles grow by sweeping up smaller, stationary grains: National Aeronautics and Space Administration
62
Settling Only National Aeronautics and Space Administration
63
Settling & Sweeping National Aeronautics and Space Administration
64
Particle growth: extreme cases BPCA Ballistic Particle-Cluster Agglomeration ⇓ ballistic hit-and-stick impacts of single dust particles into growing dust agglomerate BCCA Ballistic Cluster-Cluster Agglomeration ⇓ ballistic hit-and-stick collisions between equal-mass dust agglomerates i = 1,024 From J. Blum National Aeronautics and Space Administration
65
BPCA N=2 From J. Blum National Aeronautics and Space Administration
66
BPCA N=4 From J. Blum National Aeronautics and Space Administration
67
BPCA N=8 From J. Blum National Aeronautics and Space Administration
68
BPCA N=16 From J. Blum National Aeronautics and Space Administration
69
BPCA N=32 From J. Blum National Aeronautics and Space Administration
70
BPCA N=64 From J. Blum National Aeronautics and Space Administration
71
BPCA N=128 From J. Blum National Aeronautics and Space Administration
72
BPCA N=256 From J. Blum National Aeronautics and Space Administration
73
BPCA N=512 From J. Blum National Aeronautics and Space Administration
74
BPCA N=1024 From J. Blum National Aeronautics and Space Administration
75
BCCA N=2 From J. Blum National Aeronautics and Space Administration
76
BCCA N=4 From J. Blum National Aeronautics and Space Administration
77
BCCA N=8 From J. Blum National Aeronautics and Space Administration
78
BCCA N=16 From J. Blum National Aeronautics and Space Administration
79
BCCA N=32 From J. Blum National Aeronautics and Space Administration
80
BCCA N=64 From J. Blum National Aeronautics and Space Administration
81
BCCA N=128 From J. Blum National Aeronautics and Space Administration
82
BCCA N=256 From J. Blum National Aeronautics and Space Administration
83
BCCA N=512 From J. Blum National Aeronautics and Space Administration
84
BCCA N=1024 From J. Blum National Aeronautics and Space Administration
85
Radial Drift Hot, Dense Cold, Less Dense National Aeronautics and Space Administration
86
Radial Drift Hot, Dense Cold, Less Dense National Aeronautics and Space Administration
87
Radial Drift Hot, Dense Cold, Less Dense Grain v=v K National Aeronautics and Space Administration
88
Weidenschilling & Cuzzi 1993 1 AU in MMSN National Aeronautics and Space Administration
89
Non-fractal Aggregate Growth (Hit-and-Stick) Cratering/ Fragmentation Non-fractal Aggregate Sticking + Compaction Cratering/Fragmen- tation/Accretion Non-fractal Aggregate Sticking + Compaction Fractal Aggregate Growth (Hit-and-Stick) Restructuring/ Compaction Fragmentation »0 «0 EXPERIMENTSEXPERIMENTS Bouncing Non-fractal Aggregate Growth (Hit-and-Stick) Cratering/Fragmen- tation/Accretion Cratering/ Fragmentation Erosion ACOMPILATIONACOMPILATION From J. Blum National Aeronautics and Space Administration
90
Diameter 1 µm 100 m 100 µm 1 cm 1 m 1 µm100 m100 µm1 cm1 m Non-fractal Aggregate Growth (Hit-and-Stick) Erosion Non-fractal Aggregate Sticking + Compaction Cratering/Fragmen- tation/Accretion Cratering/ Fragmentation Fractal Aggregate Growth (Hit-and-Stick) Restructuring/ Compaction Bouncing Fragmentation »0 «0 Erosion Non-fractal Aggregate Growth (Hit-and-Stick) Non-fractal Aggregate Sticking + Compaction Cratering/Fragmen- tation/Accretion Cratering/ Fragmentation Mass loss Mass conservation Mass gain * * * * * for compact targets only Blum & Wurm 2008 National Aeronautics and Space Administration
91
Barranco 2008 Stirring by Kelvin-Helmholtz Instability National Aeronautics and Space Administration
92
Stirring by Magneto-Rotational Turbulence Turner et al. 2006 National Aeronautics and Space Administration
93
Stirring by 2-Stream Instability Johansen et al. 2007 National Aeronautics and Space Administration
94
The Life of Protostellar Disks 1.Jets and Winds 2.Basic disk properties 3.Angular momentum transport 4.Evolution of the solids National Aeronautics and Space Administration
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.