Formation process of regular satellites on the circumplanetary disk Hidetaka Okada Department of Earth Sciences, Undergraduate school of Scie
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1 Formation process of regular satellites on the circumplanetary disk Hidetaka Okada Department of Earth Sciences, Undergraduate school of Science, Hokkaido University Planetary and Space Group :
2 ., 60.,,.,,.,,.,,..,., gas-starved accretion disk model) Canup and Ward 2006) A common mass scaling for satellite systems of gaseous planets,., Canup and Ward 2006). Canup and Ward 2006),,. Canup and Ward 2006)
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13 Canup and Ward 2006) N, )..,.,,.,.,,.
14 3 9 3,,, Canup and Ward 2006),. 3.1,., -, 3. 3, ρ v t ρ t + ρv) = 0, 1) + v )v = p, 2) p = ρk BT µm u. 3)., k B, µ, m u, v, ρ, p. v = vx, t),ρ = ρx, t), p = px, t)., v 0 = 0, ρ = ρ 0, p = p 0. v = v 1 x, t), ρ = ρ 1 x, t), p = p 1 x, t), v = v 0 + v 1, ρ = ρ 0 + ρ 1, p = p 0 + p 1. 1),2), t ρ 0 + ρ 1 ) + x ρ 1v 1 + ρ 0 v 1 ) = 0, 4) ρ 0 + ρ 1 ) v ) 1 t + v 1 v 1 = x x ρ 0 + ρ 1 ). 5) 2. ρ 0 / t = 0,, ρ 0 / x =
15 , ρ 1 t + ρ v 1 0 x 6) 7) t, x, = 0, 6) ρ 0 v 1 t = p 1 x. 7) 2 ρ 1 t 2 + ρ 2 v 1 0 = 0, 8) t x ρ 0 2 v 1 x t = 2 p 1 x 2. 9) 2 ρ 1 t 2 = 2 p 1 x 2. 10). 10) 3),,, 11), 2 ρ 1 t 2 = k BT µm u 2 ρ 1 x 2. 11) ) 1/2 kb t c s =. 12) µm u 2 ρ t 2. c s. = c s 2 2 ρ x 2. 13). z, z. z, P z = GM Sunρ z r 2 r. 14), M Sun, G, ρ. P = ρk BT µm u, ρ z = GM Sunρ z r 2 r ρ ρ = GM Sun r 3 µm u k B T, 15) µm u z z. k B T 16)
16 3 11 z. z = 0 ρ = ρ0),, ρz) = ρ0) exp GM Sun µm u z 2 ) a 3. 17) k B T 2 H. 2k B T a H = 3 k B T τ K = µm u GM Sun 2µm u π. 18) τ K. 17) ) z 2 ρ = ρ0) exp. 19) H 2. z = H, ρ = ρ0) e 1/e.. 3.2,,,.., 10.,,,, 2007 ).. M c P, T, ρ.,. r F, r, r l., F σ SB [T 4 r) T 4 r + l)] 4σ SB T 3 dt l. 20) dr, σ SB., κ, ρ, l 1/κρ, 20). F 4σ SBT 3 κρ dt dr. 21)
17 3 12 F,,, 4/3,. F 16σ SBT 3 3κρ dt dr. 22),, 16σ SB T 3 dt 3κρ dr = L 4πr 2. 23), L r,.,, M c,. L GM cm c. 24) R c M c, R c,,, M atm., M r. dp dr = GM ρ, r2 25) P = ρk BT. µm u 26) R out,, T out, P out. M c M atm ). T T out, P P out, κ, 23), T = 26), ) 1/4 3κρL. 27) 64πσ SB r P = ρk ) 1/4 B 3κρL. 28) µm u 64πσ SB r
18 ), [ dp dr = d ) ] 1/4 ρk B 3κρL dr µm u 64πσ SB r = GM ρ. 29) r2, GMµmu ρ = k B ) 4 πσ SB 12κL. 30), M atm. M atm = 4πr 2 GMµmu ρdr = R c k B Rout ) 4 π 2 σ SB 3κL ln R out R c. 31) M atm M c, M M c. M M c )., 31) M M = M c + M atm. M c M atm, M atm, M atm., M c M atm, M c, M atm. M c.,,,., M = M atm + M c, dm atm /dm c =. 31) M = M atm + M c, 24) 31), GMatm + M c )µm u M atm = k B ρ c = M c / 4 3 πr c 3, ) 4 π 2 σ SB 3κ R c ln R out. 32) GM c M c R c ) M atm = M atm + M c ) 4 µmu π 2 ) 1/3 σ SB 3Mc G 3 ln R out, 33) k B 3κ 4πρ c M c R c, M atm. M c M atm = β M atm + M c ) 4. 34) M c 2/3
19 3 14, β. β = σ SB κ M c ) 4 µmu π G 3 5 k B 36ρ c ) 1/3 ln R out R c. 35) 34) M c, dm atm /dm c =, M c,crit, M c,crit = ) 3/7 27 M c β M /10 6 yr, lnr out /R c ) 0.5. ) 3/7 κ 1cm 2 g 1 ) 3/7 M. 36),.. Ikoma et al., 2000). ) ) M c fd,atm M c,crit = 10 M /10 6 M. 37) yr f g,atm, , 2, r c. 2. r, r d.,, F in, Ṁ, Ṁ = πr 2 c F in.,, 2., ν = αc s H Shakura and Sunyaev, 1973). ν, α. ν,,.
20 Canup and Ward, 2002), Canup and Ward 2002)., 2,.,.,.,., σ G / t = 0., σ G t = 1 Ṁ 2πr r + F in = 0, 38), σ G, Ṁ r = 2πrF in. 39) Ṁ r, Ṁ = 2πrσ G v r. v r. 1,, 2,.,, v j t + v v i j = 1 P + 1 p ij + x i ρ g x i ρ g x j x j GM r ). 40)
21 3 16, M, p ij. p ij = 2ρ g ν e ij 13 ) e kkδ ij, e ij = 1 vi + v ) j. 41) 2 x j x i 1, 2, 3. 40) r, φ, z). φ, v φ ρ v r r + v φ 1 r v φ φ + v v φ z = ρν 2 v φ + ρν 2 v r r 2 φ ρν 1 r 2 v φ + ν ρ r z + 1 r v φv r vφ r v φ r ) ). 42), v φ., 2 2 = 2 / r 2 + /r r+ 2 /r 2 φ / z 2., φ,,. z,., v z = 0, / φ = 0. z, σ G v r r r2 Ω) r = r r 3 σ G ν Ω ). 43) r, Ω, Ω = v φ /r. Ω Ω K Ω K ), Ω = GM /r 3 43), g r = Ṁ h r. 44) g, g = 3πσ G hν. h, h = rω 2. 38), 44). r r c, Ṁ r c < r < r d, r < r c, r = r c, Ṁ., r c < r < r d. r > r c,, F in = 0., Ṁ,,, Ṁ, Ṁ = Ṁ0 = const. 44) r c r d, Ṁ 0 h h d ) = g g d ) = g. 45), r = r d, g = g d, r = r d, g d = 0.
22 3 17 r < r c. r < r c,, Ṁ r. Ṁdh/dr = dṁh)/dr hdṁ/dr 44), h r 1/2, hṁr) + gr) = 4 5 πf inrch 2 c rph 2 p ) + A. 46), h c = r c 2 Ω c, h d = r d 2 Ω d, r P. A. r = r P, gr P ) = 0., A = Ṁph p 4 5 πf inr 2 ph p., Ṁ P. r = r c., Ṁ = Ṁ0, r = r c, h c Ṁ 0 + Ṁ0h d h c ) = 4 5 πr c 2 h c F in + Ṁph p 4 5 πf inr p 2 h p, 47) Ṁ 0 h d Ṁph p = 4 5 πf inr c 2 h c r p 2 h p ). 48),,,.,, r d,., 48), 49), Ṁp + Ṁ0 = Ṁ πf inr p 2. 49) Ṁ 0 h d πf in r c 2 πf in r p 2 + Ṁ0)h p = 4 5 πf inr c 2 h c r p 2 h p ). 50), h p = r p 2 Ω p,, Ω d = GM GM r 3 d, Ω c = r 3 c, Ω p = GM r 3 p, Ṁ 0 r 1/2 d r 1/2 p ) = πf in r 2 c r 1/2 p πf inr 5/2 p πf inr 5/2 c, 51) [ ) 1/2 2 4 rc Ṁ 0 = πf in r c + 1 ) ] [ 2 rd ) ] 1/2 1 rp ) 5 5 r p r c r p
23 3 18 Ṁ 0, Ṁr > r c), Ṁr < r c ). Ṁr > r c ) = Ṁ0, = πf in r c 2 [ 4 5 rc r p ) 1/ rp r c ) ] [ 2 rd ) ] 1/ r p 53) rc Ṁr < r c) = 2πrF in dr Ṁ0, 54) r [ ) ] 2 2 r = πf in r c 1 4/5)r c/r p ) 1/2 + 1/5)r p /r c ) ) r d /r p ) 1/2 1 r c,, r p /r c ) 2 1, r d /r p ) 1/2 1., [ ) ] 1/2 4 rc Ṁr > r c ) = Ṁ0 Ṁ, 56) 5 r d [ ) 2 r Ṁr < r c ) Ṁ 1 4 ) ] 1/2 rc. 57) 5,. r c r d r > r c ), r < r c ), [ σ G r) 4Ṁ rc 15πν r σ G r) 4Ṁ 15πν rc r d ]. 58) [ 5 4 rc 1 ) ] 2 r. 59) r d 4 r c
24 ,,,,.,.,.. r,, GM P Ṁ/r) r GM P Ṁ r 2 r. 60),, Ėν,,, Ė ν = 9 4 νω2 σ G 2πr r. 61) Ė rad = 2σ SB T d 4 2πr r. 62), T d., T d, 9 4 νω2 σ G 2πr r = 2σ SB T 4 d 2πr r, 63) [ T 4 d 9Ω2 νσ G = 3Ω2 r 2 c F in 1 4 rc 1 ) ] 2 r. 64) 8σ SB 5 r d 5 8σ SB T d F in 1/4, α σ G. r c.,,.,
25 3 20,. Canup and Ward, 2002). [ ) ] 4 T 4 c T 4 d Tneb T d τt d 4. 65) τ.,, T d T c. 3) Canup and Ward 2002).,. 25R J 1000K,, r 20R J 200K,.
26 3 21 3, Canup and Ward, 2002) T d, T c. 4. τ G τ G ) τ G = 10 4 yr, τ G = yr,.
27 , r. r 2πr r/f. f -., m s. τ acc = fm s 2πr rf in. 66) r e, r/r 2e.,,,.,,,.,,. e τ col, τ drag, τ dw., e τ relax, e τ col = τ relax, τ drag = τ relax, τ dw = τ relax., e, τ dw = τ relax., τ dw = τ relax e. Ward 1988), τ dw = 1 ) ) M M c ) 4. 67) C e Ω M σ G r 2 rω,, τ relax = 0.73 ) ) M M v ) 4 [ln 2Λ] 1 Ω M σ S r 2. 68) rω, σ S, v,. τ dw = τ relax,, v
28 3 23 v dw, 67) 68), ) ) 1 M M c ) = C e Ω M σ G r 2 rω Ω v dw = c σs σ G M ) ) vdw M ) 4 [ln 2Λ] 1 M σ S r 2, 69) rω ) 1/4. 70), e. v dw v K σs Γ σ G ) 1/4 ) H e. 71) r Γ 1. r m s, σ S σ S = m s /2πr r., ) 1/4 ) m s H e, 72) 2πr rσ G r ) 1/4 ) H 4πr 2 e 5/4, 73) σ G r ) 1/5 ms. 74) ms e H r 4πrHσ G 74) 66), τ acc fσ G F in ms 4πrHσ G ) 4/5. 75),..,. τ 1. τ 1 = 1 C a Ω Mp m s ) Mp r 2 σ G ) ) 2 H. 76) r C a 1. 76), H/r) c/rω) 0.1.,.
29 τ acc, Type I migration., τ acc τ 1 m s,, m c., m crit /M P. 75) 76), fσ G F in mc 4πrHσ G ) 4/5 = 1 C a Ω Mp m s ) Mp r 2 σ G ) ) 2 H. 77) r, F in F in = M P /τ G πr c 2., τ G = M P dm/dt) 1. 77), fσ G M P πr c 2 τ G mc 4πrHσ G ) 4/5 = 1 C a MP m c ) MP r 2 σ G ) ) 2 H. 78) r, σ G r < r c,. [ σ G = 4F 5 15πν 4 rc 1 ) ] 1/2 r, 79) r d 4 r c 0.2 ) Fin r ) 2 rc ) 2. 80) α Ω H r, ν = αch, H/r c/rω, r/r c = 0.5, r/r d = 0.2., 78), f M P 3 0.2Fin αω ) 6/5 r H ) 12/5 rc ) ) 12/5 4/5 1 2 πrc τ G m 9/5 c = H2 r 4πrH C a r 4. 81), mc M P ) ) 5/9 ) 26/9 ) 10/9 ) 2/3 π H r α 5.4 Ωτ G f) 1/9 82) C a r r C f ) 5/9 ) 26/9 ) 10/9 ) 2/3 3.5 H/r r/rc α/f χ ) C a χ χ [1week/2 /Ω))f/10 2 )τ G /10 7 yr)] 1/9, m crit /M P, 1. H/r), r
30 3 25, H/r) 0.1. r c, r/r c ), 1. m c /M P, α, f. α,..,. - f. 3.7 r. 1 R P < r < r c. MT M P ) = rc m crit/m P ) R P r dr. 84) r, r/r e. e, 74), F in = M P /τ G πr c 2, σ G 80), r H 84), MT M P ) = mc ) 1/5 α 4πrH 0.2 rc R P rc 1 R P r m c 1 M P H 1 C a ) 1/5 πrc 2 τ G Ω M P ) 1/5 ) 2/5 ) 2/5 H r. 85) r r c mc απr 2 ) 1/5 ) 2/5 ) 2/5 c τ G Ω H r dr, 0.8πrHM P r r c 86) ) 4/9 ) 10/9 ) 8/9 ) 1/3 H r α 1 dr. r r c f 1/9 Ωτ G f) 87), H/r, f,, r c R P,. MT M P ) C a χ ) 4/9 ) 10/9 ) 1/3 H α 1 r f ) 4/9 3.5 H/r 0.1 1, α/f). C a. 88) 1/9 Ωτ G f) ) 1/3. 89) ) 10/9 α/f
31 3 26 α.,, α 10 4 < α < 10 2., α 3, M T /M P 1. M T /M P.
32 Canup and Ward 2006)..,,.,, Type I migration.,,,.,,,.,,,,.,,. Canup and Ward 2006),,.,.
33 5 Canup and Ward Canup and Ward 2006 Canup and Ward 2006) A common mass scaling for satellite systems of gaseous planets ) ,,,,, 10,,.,,. )..
34 5 Canup and Ward ,. M T M P, M T /M P ,., ) H + He).,M T /M P ) 10 4 ). M T /M P ) = M T /M P ) ,,,,.,,.,.,,. 10 4,.,,,. 5.3,, ,, ),
35 5 Canup and Ward , Fig ).,.,,,.,.,,.,,...
36 5 Canup and Ward a, ).. b,. F in 1/r) γ in r γ in ), r in r c ). F in f. ν r 2 /ν, ν = αch ). α 1 c H. ν F in / F in in, σ G. γ in = 0, r r c, σ G 0.3F in r c 2 /ν)[1.2 r c /r d r/r C ) 2 /4] 0.21/α) F in Ω 1 )r/h) 2 r c /r) 2 r/r c ) = 0.5, r c /r d ) = 0.2 ref.9 ). r d,ω r. r c 10R P.,,., 10 4 < α < 0.1,r r c 30R P τ ν 1/α).,,,,. f 10 2., f 3 30.,, f.,,, f.
37 5 Canup and Ward ,,. m s /M p ), m s /M p ) 2. m s..,, 1,. e) a) τ e,τ 1, τ e = e/ ė, τ 1 = a/ ȧ. τ 1 = 1 C a Ω Mp m s ) Mp r 2 σ G ) ) 2 H = C e τ e r C a H/r) 2. 5.A.1) C a C e 1. σ G. Ω = GM p /r 3 ) 1/2 r. H, c, H/r) c/rω) 0.1.,., 1.. m s τ acc τ acc fm s /2πr rf in ). F in, f -, 2πr r. e ). r/r 2e, e H/r)m s /4πrHσ G ) 1/5,,. r, τ acc fσ G /F in )m s /4πrHσ G ) 4/5. m crit, 5.A.1) τ acc = 1,m S = m crit., G,. α.
38 5 Canup and Ward G F i n/α).fig.1 ) r c,., F in M P / r C 2 G )., G M P dm/dt 1 M P. ), ) ) 5/9 ) 26/9 ) 10/9 ) 2/3 mc π H r α 5.4 Ωτ G f) 1/9, 5.A.2) M P C a r r C f ) 5/9 ) 26/9 ) 10/9 ) 2/3 3.5 H/r r/rc α/f χ A.3). C a,χ [1week/2 /Ω))f/10 2 )τ G /10 7 yr)] 1/9 1. m crit /M P ) χ G ) 1/9.,. H/r), r, H/r) 0.1. r c,, r/r c ), 1. 5.A.3). α - f.,., 1., f.,. m crit., 1 m crit., 1 acc ).,, m crit,m T. H/r), f,, ) rc MT m crit/m P ) = dr, 5.A.4) M P R P r ) 4/9 ) 10/9 ) 1/3 1 H α C a r f Ωτ G f), 5.A.5) 1/ ) 4/9 ) 10/9 ) 1/3 3.5 H/r α/f χ A.6) C a
39 5 Canup and Ward r C R P. R P. M T /M P ) χ, r c, α/f). 5.5 N,.. F in /f).. 4 α/f). 1. M T /M P ) 5.A.6) M T,, 5.A.3) 5.A.6)., f = 10 2 ) 10, M T /M P =
40 5 Canup and Ward M T, M P τ G M P /dm/dt) 1, dm/dt. τ G = yr, r C = 30R P, γ in = 0. α/f) = 10 6, , ,,. M T m crit 5.A.3) )., M T., m crit,. M T /M P ) α/f) 1/3, α/f) 500, 10. M T /M P ), m crit. α/f), τ G.. M T /M P ). 5.A.3) 5.A.6),..., 5.A.3), 5.A.6) M T /M P ).
41 5 Canup and Ward a. b c m s M P ). b c γ in = 0, r c = 30R P, 1.7 < M in /M T < 10 M in ), τ G, yr yr τ G M in /M T )... b α/f) = , α = 0.05, M T /M P ) = c39 ).,α/f = 10 6 ), α = 10 4 M T /M P ) = α/f) = , α = M T /M P ) = c20 )., α/f) = , α = M T /M P ) = 10 4 c64 ). M T /M P ) = c17 ), α/f) = , α = R P M P, R P C C 7). ). α/f) = c60 ), M T /M P ) = M T,
42 5 Canup and Ward c b M T /M P ). 7 F in t) = F in 0) exp t/τ in ) σ G t) = σ G 0) exp t/τ in ). τ in 10 5 τ in years) ) t = 0., r C /R P = 25, 30, 44).,,,,. a α/f),. b α/f),. 4 ). a,b, r/r c ) = 0.5, c/rω) = 0.1, τ in = 10 6 yr, τ G = τ G,last τ in M P /M T )/f 5.A.3), 5.A.6).. α T P = 500K K = 0.1. ) T P K ). 1,. 1,. 5/2 m Gap /M P C v αh/r). Cv C v = 3, m Gap, < m lgst /m Gap >= , m Gap, τ v τ i n ). 1 M T m S.
43 5 Canup and Ward ,,.,,...,,,, r c ).,,.. α) - f ). M T /M P ) α/f) 1/3 α/f)., α/f) 10 6 < α/f) < ,,. α, f, b c20 ),,.. 75 N = 7.,., N.,
44 5 Canup and Ward m s /M P ) 10 5 N lg = 4. < C lg > 17). r c 25R P r C 44R P 20 < a max /R P < 60). r c a max 2. r c, R H ) j, 3. j j = Ω P R 2/5 H Ω P, R H = a P M P /3M ) 1/3, a P, M ), r r = j 2 /GM P,,,,r /R P r c 1.6r, r c < j >= GM P r.. T eff F 1/4 in,ref.9 )., τ G ), 5.A.3) 5.A.6) f ).,., τ in = 10 6 yr ), 15R P 200K α 10 3, K = O10 1 )cm 2 g 1, 500 K,ref.9 ),.,,,. 7 c17 1),.,,. τ in = 10 6 yr,m T /M P ) O10 4 ) 10, 2,3.
45 5 Canup and Ward ),., 98.,. ),. 27.,....., M T riton /M P ,.,., ).,. ),,. M T riton,, M T /M Neptune O10 4 ).
46 5 Canup and Ward ,3,..,., years ), 10 4 M P, -.
47 5 Canup and Ward ,,...,..
48 43 [1] Canup, Robin M., Ward, William R. : A common mass scaling for satellite systems of gaseous planets. Nature, Volume 441, Issue 7095, pp ). [2] Canup, Robin M., Ward, William R. : Formation of the Galilean Satellites: Conditions of Accretion. The Astronomical Journal, Volume 124, Issue 6, pp ). [3] Ikoma, Masahiro; Nakazawa, Kiyoshi; Emori, Hiroyuki., Formation of Giant Planets: Dependences on Core Accretion Rate and Grain Opacity., The Astrophysical Journal, Volume 537, Issue 2, pp ). [4] Hayashi, C., Nakazawa, K., Nakagawa, Y. : Formation of the solar system. IN: Protostars and planets II A ). Tucson, AZ, University of Arizona Press, pp ). [5] Mosqueira, Ignacio., Estrada, Paul R. : Formation of the regular satellites of giant planets in an extended gaseous nebula I: subnebula model and accretion of satellites. Icarus, Volume 163, Issue 1, pp ). [6] Lubow, S. H., Seibert, M., Artymowicz, P., Disk Accretion onto High-Mass Planets., The Astrophysical Journal, Volume 526, Issue 2, pp ) [7] Shakura, N. I., Sunyaev, R. A. : Black holes in binary systems. Observational appearance. Astron. Astrophys., Vol. 24, pp ) [8], :.. pp ) [9], : ) [10], : )
Hidetaka Okada Department of Cosmosciences, Graduate School of Science, Hokkaido University
Hidetaka Okada 21372 Department of Cosmosciences, Graduate School of Science, Hokkaido University 212 2 28 , N 2.,.,.,. N 2, Ar. Ar, N 2, NH 3 N 2.. Kuramoto and Matsui (1994),,., 1 5, 5 K,,., Ar, Ar.,,
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