Kenneth Wood St Andrews
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Transcript of Kenneth Wood St Andrews
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Monte Carlo Radiation Transfer in Protoplanetary Disks:
Disk-Planet Interactions, Structure and Warping
Kenneth Wood
St Andrews
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Radiation Transfer + Hydrodynamics
RT Models: Barbara Whitney, Jon Bjorkman, Christina Walker, Mark O’Sullivan
Dust Theory: Mike Wolff
SPH Models: Ken Rice, Mike Truss, Ian Bonnell
Observations: Charlie Lada, Ed Churchwell, Glenn Schneider, Angela Cotera, Keivan Stassun
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Monte Carlo Development History• Scattered light disks & envelopes (1992)• 3D geometry & illumination (1996)
• Dust radiative equilibrium (2001)• Monte Carlo for disk surface +
diffusion for interior (2002)
• Density grids from SPH simulations (2002)• Spatial variation of dust opacity (2003)• Self consistent vertical hydrostatic equilibrium (2003)
1992: Predictions 1996: HST data
GM Aur: 4AU gap, disk-planet interaction
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Disk Structure Calculations
• Above used parameterized disks: power laws for (r), h(r)
• Disk theory: reduce model parameter space• Irradiated accretion disks: ~ r -1, h ~ r 1.25
(D’Alessio, Calvet, & collaborators)• New Monte Carlo: iterate for disk structure
(Walker et al. 2004)• Model disks around GM Aur and AA Tau
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Disk-Planet Interactions: Gap Clearing
Papaloizou, Lin, Bodenheimer, Lubow,
Artymowicz, Nelson, D’Angelo, Kley, …
Simulation from Ken Rice & Phil Armitage
• Observational signatures: images, SEDs?
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Protoplanetary Disks• Need high resolution imaging: ALMA
• Gap clearing simulation images:
700m 700m ALMA simulation
Wolf et al. 2002
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Inner Gaps from SED Modeling
• Remove inner disk material: remove near-IR excess emission
Rin = 7R*
Rin = 4 AU
GM Aur
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GM Aur: Disk/Planet Interaction?
• NICMOS coronagraph
• Scattered light modeling:
• Mdisk ~ 0.04 M; Rdisk ~ 300 AU; i ~ 50
Schneider et al. 2003
1200 AU
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GM Aur: Disk/Planet Interaction?
• No near-IR excess
• SED model requires 4AU gap: planet?
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GM Aur: Disk/Planet Interaction?
• 3D SPH calculation from Ken Rice
• Planet at 2.5AU clears inner 4AU in ~2000 yr
Rice et al. 2003
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GM Aur: Disk/Planet Interaction?
• 3D SPH calculation from Ken Rice
• Planet at 2.5AU clears inner 4AU in ~2000 yr
Rice et al. 2003
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GM Aur: Disk/Planet Interaction?
• Spitzer SED can discriminate planet mass
• Centroid shifting ~ 0.1mas: Keck, SIM?
Rice et al. 2003
Mp = 2MJ Mp = 50MJ
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GM Aur: Disk/Planet Interaction?
• Spitzer SED can discriminate planet mass
• Centroid shifting ~ 0.1mas: Keck, SIM?
Rice et al. 2003 Calvet et al. 2002
GM Aur TW Hya
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AA Tau: Large and Small Scale Disk Structure
• Photopolarimetry (Bouvier, Menard, et al.)P ~ 8.4 days, V ~ 1 mag, (B-V) ~ 0Star eclipsed by warp in inner disk
• SED model to get disk structure
• Warped disk model for photopolarimetry
• SPH: tilted dipole warps disk
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AA Tau SED Modeling
• T = 4000 K, R = 2R, M = 0.5M
• M = 2e-9 M/yr, Rd = 200 AU, i = 70
O’Sullivan et al. (2004)
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Analytic Disk Warp
• AA Tau: P ~ 8.4 days
• Warp at r ~ 0.07 AU, amplitude ~ 0.02 AU
O’Sullivan et al. (2004)
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Photopolarimetry Simulation
V
P (%)
PA
V ~ 1 magP ~ 0.3%
O’Sullivan et al. (2004)
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SPH Simulation
• Inclined dipole field: include magnetic force in SPH code (NOT MHD!)
• Need B = 2 kG, at latitude = 65 (see also Terquem & Papaloizou)
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Summary & Future Research• Monte Carlo: self-consistent disk structure calculations• GM Aur: Disk-planet interaction, need Spitzer SEDs• AA Tau: SED model for disk structure
Warped disk for photopolarimetrySPH: dipole B = 2 kG, at latitude = 65
• Coding: Radiation pressureInclude gas opacity
Transiently heated grains• Goal: merge radiation transfer & hydro• Codes now available at:
http://gemelli.spacescience.org/~bwhitney/codes
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Disk Dust: Grain Growth
ISMDisk dust
Dust Size Distribution:Power law + exponential decayGrain Sizes in excess of 50mGrayer opacity, Sub-mm slope ~ 1/
Fits HH30, GM Aur, AA Tau
Beckwith & Sargent (1991): sub-mm continuum SEDs: ~ 1/
m506.05.3
/exp~)(
c
qc
p
aqp
aaaan
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Estimating Rin from SEDs
• Hot inner edge emits in IR • Include inner edge emission when estimating Rin
6 AU 20 AU 300 AU
T
1/5
GM Aur
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Monte Carlo, Rin = 4 AU, i = 0 - 50CG97, Rin = 0.1 AUCG97, Rin = 4 AU
Vertical Hydrostatic Equilibrium
GM Aur
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• MC models include inner edge emission
• Other models without inner edge emission
• No 10m excess MC:Rin > 10 AU CG:Rin ~ 2.5 AU
Monte CarloCG97KH87ALS87
Estimating Rin from SEDs
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Disk Structure
Walker et al. (2004)
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D’Alessio: i = 60MC: i = 63MC: i= 60
SEDs
Walker et al. (2004)
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Comparison Summary
• MC: Disk slightly hotter at large radiiSlightly more emission in 20-200m
• Differences: Radiation pressureDust opacityTreatment of upper layersNon-isotropic scatteringRadial transport in outer disk