Dynamics of the solar system
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1 Dynamics of the solar system
2 Planets: Wanderer Through the Sky
3 Planets: Wanderer Through the Sky
4 Planets: Wanderer Through the Sky
5 Planets: Wanderer Through the Sky
6 Ecliptic
7 The zodiac
8 Geometry of the Solar System Nearly all planets rotate synchronously around the Sun
9 Spin distribution of the planets
10 The school of Athens (Vatikan) Raffael 1510 Sokrates Platon + Aristoteles Zarathustra R Pythagoras Ptolemäus Euklid
11 The World of Ptolemäus Platon and Aristoteles Aristoteles Earth: center of the Universe Everything else rotates in circles around Earth
12 The Epicycles of Ptolemäus
13 The Heliocentric Concept (Nikolaus Kopernikus) ( ) Which world model is correct?
14 The Problem with Mercury (Nikolaus Kopernikus) ( ) Why a circle?
15 Johannes Kepler Tycho Brahe ( ) No circle! ( )
16 Kepler s Laws: 1. Planets move in ellipses with the Sun in one of their focal points. Eccentricity: Ellipticity: Perihelion distance: Aphelion distance:
17 Elliptical orbits: Orbits with eccentricity e < 1 are bound ellipses a p a b
18 Jupiter: Eccentricity: 0.05 Perihelion: 4.95 AU Aphelion : 5.46 AU Eccentricity distribution of extrasolar planets
19 Pluto: The 5 moons of Pluto Pluto: discovered 1840 on a 248 yrs orbit Uranus: a = 30.11AU e =
20 3:2 Resonance
21 2. The position vector covers equal areas in equal times 3. The square of the orbital period is proportional to the cube of the length of the major axis.
22 Mercury Venus Earth Mars Jupiter Saturn Uranus Neptun Pluto But: Kepler s laws cannot explain the distances of the planets.
23 Orbital radii in AU
24 The Titius-Bode Law: Planet Titius-Bode Observed Distance (AU) Distance c A similar law works for many moons The Moons of Uranus
25 Sir Isaac Newton ( )
26 m Planet Sun This 2-body problem consists of 3 differential equations of second order. Its solution requires 6 constants of integration which are the initial conditions: The solution determines the velocity and location of each planet as function of time relative to the Sun.
27 The Orbital Plane: This is true for all radial forces!!! y Axisymmetry: h_z conserved, no orbital plane r Planet Triaxial: no h conservation no orbital plane angular momentum vector The planet moves in one plane. Its orbit is then completely specified by its radius r und its position angle Sun Circle x period angular velocity
28 The second Keplerian Law e = 0
29 Circular orbit: (e = 0 and r = a): 3rd Keplerian Law:
30 The second Keplerian Law e = 0.5
31 The second Keplerian Law e = 0.97
32 (Keplers third law) + e = 0 No dependence on e or h Closed ellipses Only true if f (r)! GM (r) = GM 0 r 2 r 2 e = 0.5 e =
33 Chaos starts as soon as N > 2 Here: a 3 body encounter
34 Ionisation: No energy conservation for each particle!!!!! Exchange: b
35 The Chaotic Moon The Moon s orbit relativ to the Sun is almost circular The Moon s orbit shows complex perturbations as a result of the gravitational interaction with the Sun (3-body problem) This made it difficult to use the Moon in order to determine the geographical length. Even famous mathematicans and astronomers like Newton or Laplace were not able to predict the Moon s orbit with high accuracy.
36 Tycho Brahe wanted to determine the Moon s orbit with high accuracy. For that he determined precisely the time of linar eclipses and developed a theory. With his new theory and a position of the Moon on December, 28th, 1590 he predicted that the next lunar eclipse will start on Decémber, 30th 1590 at 6:24pm. The eclipse however began while Brahe was still having dinner and was almost over when Brahe finally started his measurements at 6.05 pm. Brahe then stopped investigations of the Moon for some time.
37 The moon has a stabilising effect on the orbit of the Earth Numerical simulation of the solar flux onto Earth at 67 North Past with Moon Future without Moon
38 Chaos in the solar system An error of 15m in the position of the Earth will in 100 million years have grown to an error of 150 million km = 1 AU. It is impossible to determine the precise position of the Earth over several Gyrs Mercury
39 Henry Poincare ( ) Poincare showed that the 3-body problem in general has no analytical solution and can only be solved approximately. Lagrange-system He also showed that the solutions can be rather complex and often chaotic. However analytical solutions exist.
40 Chenciner Montgomery system
41 Chenciner Montgomery system
42 Chenciner Montgomery system
43 The large Moons of Saturn (Cassini-Huygens) chaotic rotation (vulcanism)
44
45 The dance of the moons Janus and Epimetheus: Almost on the same orbit meet every 4 years
46 e = 0.97
47 (Keplers third law) e = 0 + Given T and a we can determine M+m e = 0.5 e =
48 Searching for extrasolar planets
49 Dynamics of binaries
50 The spectroscopic method (G. Marcy und P. Butler, San Francisco) System from above (unlikely) System from the side (more likely)
51 The spectroscopic method (G. Marcy und P. Butler, San Francisco) System from above (unlikely) System from the side (more likely)
52 The solar system The spectroscopic method m/s Years In 1995 Marcy & Butler had their spectrograph optimized enough to detect velocity shifts of order a few m/s..
53 The hit by the Swiss On September, 8th 1995 the Swiss Mayor and Queloz (Genf) found the first planet that orbits an solar-type star. The planet around 51 Peg: a hot Jupiter 60 m/s -60 Days 0 3
54 Planeten Transits The Kepler mission
55
56
57 More than 1000 extrasolar planets detected so far
58 Small and low-mass planets are numerous
59
60 The habitable zone
61
62 62
63 Karl Jansky ( )
64
65 65
66 66 ESO
67 !""#$%&'#(#)"*&#(+%"
68 9:"$;"'&")&+'<=,-./0& 123&45'56&45(758#)"
69
70
71 )**+$ +,))$ )**-$ Keplerian Orbit Dec '' /$ 01&'(2&$ 0.05 M = 4.3 ± 0.35!10 6 M! ,,+$ 034$.5$$ 6274&8$$!"#$ %&'($ R.A. ''!"#$%&'(&)(*'+(,--,.(,--/.(0#&1(&)(*'+(,--/.(,--2.(,--3.(04''&55&6(&)(*'+(,--7*.8.(0&61&'(&)(*'+(,-9-(
72
73 The Bondi Radius
74 Sgr A* : Eine bubble of 100 Mio. degree hot gas
75
76 Elliptical orbits: a p a b Major axis: Orbits with eccentricity 0 < e < 1 are bound ellipses The result of Newton s law of gravity is more general.
77 Two free parameters: p and e y = k! x 2 Circle Ellipse Parabola Hyperbola Eccentricity e : 0 < 1 1 > 1 Perihelion : a p/(1+e) = a(1-e) p/2 p/(1+e) Aphelion : a p/(1-e) = a(1+e) Unbound particles can get very close to gravitating object!
78 The Orbital Energy: d dt! " # 1 2!" r 2 What does this mean, physically? $ % & =!! r " ' r "! = -G M + m " " d( r ' r! = - r 3 dr " ' dr " dt = - d( dt The gravitational potential: (conservation of energy)
79 At Perihelion: v p! r p With: and No dependence on h!! Ellipse: Parabola: Hyperbola: The geometry is determined just by E. (see also cosmology)!!
80 Friedman equation Total energy: Elliptical universe (k > 0): E < 0 Parabolic universe (k = 0): E = 0 Hyperbolic universe (k < 0): E > 0 80
81
82
83
84 Halley s comet (74-78 period) 2024
85 Circular orbit: (e = 0 and r = a): 3rd Keplerian Law: ( virial theorem )
86 Circular orbit: (e = 0 and r = a): 3rd Keplerian Law: The virial theorem applies to all bound stellar systems in equilibrium.
87 The Virial Theorem Total energy: E = E kin + E pot 2! E kin = "E pot with (negative specific heat) Reason: If orbital energy is extracted the kinetic energy increases and the satellite moves onto an orbit with smaller radius: v a Note: For elliptical orbits the virial theorem is valid only when averaging over one orbit.
88 E pot =! GM r!e = 1 2!E pot
89
90 What if we would live in higher dimensional space? The inverse square law of gravity appears to be a property of 3-dimensional space. But why is space 3-dimensional? It is reasonable to generalize this law to n-dimensional space as: F(r)! r!(n!1) Stable orbits are only possible for n <= 3
91 What if we would live in higher dimensional space? Newton s law in spherical symmetry:!! r =!F(r) + L2 r 3 F(r)! r!(n!1) Circular orbit: F(r c ) = v 2 rot r c = L2 r c 3 Small radial perturbation x, keeping L constant: r = r c + x!! r c +!!x =!F(r c )! x df + L2 3 dr rc r c! 3x L2 r c 4 ( )!!!x + x# df + 3 F r " dr rc r r c $ & = 0 % harmonic oscillator
92
93 What if we would live in higher dimensional space? ( )!!!x + x# df + 3 F r " dr rc r r c $ & = 0 % harmonic oscillator Solution: x(t) = x 0 exp( i!t )! 2 = df + 3F(r) dr rc r r c Stable solution:! 2 > 0 Suppose: F(r) = k / r n!1 df dr + 3F r =! k ( n!1) + 3 k r n!2 r = n!2 k ( 3! (n!1)) > 0 r n!2 n < 4
94 The dynamics of particle systems
95 Why stars do not collide
96 Voyager 1 (1977) Sun: 800,000 km/h 62,000 km/h
97 Proxima Centauri 4 light years 74,000 yrs for Voyager I
98 5 cm?
99 5 cm 5000 km
100 Galaxies are collisionless system. Galaxy-galaxy interactions however occur frequently During the collision of a galaxy, the stars do however not collide with each other. Text
101 Gravitation is a Long-Range Force Stars are test particles within the potential of all the other stars
102 The gravitational potential Newton: m M For N point masses we have:
103 The gravitational potential test particle Newton: m M For N point masses we have: The gravitational acceleration is independent of the mass of the test particle.
104 At a given point the acceleration is: Is it possible to find a distribution of masses for any force field Or is the gravitational field peculiar?
105 This gravitational acceleration can be defined as gradient of a scalar (potential) We choose the zero point such that: Note: The potential is the work, exerted by the gravitational field onto a unit mass that falls from infinity to radius r! r W =!E = m! fd r! r = "m #$ #r! dr! & = m $ % " $ r! & %! % ( ( )) = "m ' $ ( r! )
106 The time independent gravitational potential is conservative The required work W for a point mass m is independent of its detailed orbit. W=m 2 $ 1 2 $ 1 ( ) W 1,2 = m! f d! x = m!! "#d! x = m # 1! # 2 We can travel to all points with (energy conservation)
107 Point mass potential The potential in spherically symmetric systems: r Escape velocity: Rotational velocity: Point mass:
108 Forces and the potential of extended, spherical systems Given a density distribution: Calculate from the gravitational potential and the gravitational force Newton s 1st law: The gravitational force within a spherical shell of homogeneous density is zero.
109 Newton s 2nd law The gravitational force of a spherical shell of homogeneous density and mass dm onto an object outside of the shell is equal to the gravitational force of a point mass dm in the center of the shell. Gravitational force at r r
110 The Milky Way
111 The Milky Way in Visible Light
112 A simple model of the Milky Way For r < R : Edge of the dark halo at r = R :
113 Escape velocity: Solar neighborhood Total mass:
114 The Magellanic Clouds
115 Tangential velocity: Radial velocity: Distance: Bound Orbit:
116 More sophisticated determination of Energy equation: Total visible mass: Note: The cosmic baryon fraction is 0.2. Where are most of the baryons?
117
118 Rotation curves of galaxies NGC 3198
119 Dark matter distribution in NGC 3198 Rotation curve Mass distribution M(r) Dark matter Visible matter
120 Orbits in extended, spherically symmetric mass distributions In spherically symmetric systems the gravitational acceleration is: a! (r! ) = f (r)!e! r In this case, point masses move in a fixed orbital plane. The angular momentum vector is constant: y We are looking for a solution in the equatorial plane of x!! r = f (r) + L2 r 3 L = r 2!
121 Fundamental orbital equation for spherically symmetric gravitational potentials!! r = f (r) + L2 r 3 L = r 2! In general this equation has to be integrated numerically. Exceptions: Keplerian potential Harmonic potential
122 r min,max (E, L) Loss of information about initial state Orbit area filling as change in angle!" over one orbital period is in general an irrational number Gas particles would dissipate random motion There are two and only two potentials with bound closed orbits: Physics of Rosette or loop orbits 1. Keplerian potential: 2. Harmonic potential:
123 Angular momentum and the effective potential Effective Potential:
124 Orbits with constant angular momentum L 0 Unbound hyperbolic orbits (comets) Bound orbits -1 0 Plummer profile r The angular momentum acts like a centrifugal barrier
125 Orbits with constant angular momentum L Pericenter circle 0 E -1 0 Plummer profil r Apocenter For given L the orbit with the lowest energy is a circle.! eff = E v R = 0
126 Why do cosmic particle systems appear relaxed?
127 M87 Essential Astrophysics SS 2014
128 Dynamics of a relaxed particle system
129 Essential Astrophysics SS 2014
130
131
132
133 CDM simulation
134 Dynamics of a relaxed particle system
135 Dynamics of a relaxed particle system
136 Dynamics of a relaxed particle system v rad r
137 Dynamics of a relaxed particle system E r
138 Dynamics of a collapsing particle system
139 Dynamics of a collapsing particle system
140 Dynamics of a collapsing particle system
141 Dynamics of a collapsing particle system v rad r
142 Dynamics of a collapsing particle system E r
143 Phase Mixing Consider a disk of stars that move on circular orbits with angular velocity Assumption: All stars initially are at system is highly ordered initially end Stars
144 Phase Mixing of Stellar Systems For all stars are out of phase and equally distributed. Mixing timescale:
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