probing the inner circumstellar structures of t tauri and herbig stars
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Probing the inner circumstellar structures of T Tauri and Herbig stars. Jorick Vink (Imperial College London) Janet Drew (Imperial), Tim Harries (Exeter), Rene Oudmaijer (Leeds), Vink et al., 2005b, MNRAS accepted, astro-ph/0502535. Outline. Introduction on Spectropolarimetry Data - PowerPoint PPT PresentationTRANSCRIPT
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Probing the inner circumstellar structures of T Tauri and Herbig
starsJorick Vink (Imperial College London)
Janet Drew (Imperial), Tim Harries (Exeter),
Rene Oudmaijer (Leeds),
Vink et al., 2005b, MNRAS accepted, astro-ph/0502535
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Outline
• Introduction on Spectropolarimetry• Data
– T Tauri 1 Msun– Herbig Ae 3 Msun– Herbig Be 10 Msun
• Disc scattering models – inner hole– undisrupted
• Conclusions
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Polarimetry – from disks
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Polarisation across line?
1. No change
2. Depolarisation
3. LINE Polarisation
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No Polarisation
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Depolarisation
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Line Polarisation – PA Flip
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Survey Herbigs and T Tauris
• Herbig Be stars: 12
• Herbig Ae stars: 11
• T Tauri stars: 10
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Data: Herbigs and T Tauris
T TauriHerbig Be Herbig Ae
PA
Pol
I
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Polarisation across line?
1. No change
2. Depolarisation
3. LINE Polarisation
Herbig Be: 7/12
Herbig Ae: 9/11 (Vink et al. 2002, MNRAS)
T Tauri: 9/10 (Vink et al. 2003, A&A)
(Vink et al. 2005b)
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QU: Herbig Ae and T Tauri star
MWC 480 RY Tau
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Models of COMPACT line emission
• 3D Monte Carlo
• Keplerian rotating disk
• Flat or constant opening angle
• Scattering only – no line transfer
• With and without an inner hole
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With/without an inner hole
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With/without a hole
Vink et al., 2005a, A&A accepted
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Constraining the inner disk radius
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Constraining the inner hole size:
Single PA flip; known inclinations
AB Aur Inner rim > 5 Rstar
CQ Tau Inner rim > 4 Rstar
SU Aur Inner rim > 3 Rstar
Gradual PA change
GW Ori Inner rim 3 or 4 Rstar
(Vink et al. 2005a, 2005b)
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McLean effect in FU Ori
PA
Pol
I
Accurate measurement of intrinsic polarisation PA
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Imaged disks: position anglesPA line pol PA direct Delta PA
AB Aur 160 60/80 80/100
MWC 480 55 150 95
CQ Tau 20 105 95
RY Tau 163 62 101
FU Ori 45 47 2
SU Aur 130 127 3
DR Tau 120 128 8(Vink et al. 2005b)
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Conclusions
• Herbig Be: disks on small scales
• Herbig Ae/T Tau: rotating accretion disks
• Inner rim sizes 3 – 5 stellar radii
• Herbig Ae: polarisation PA perpendicular to disk PA optically inner thin
• T Tauris: polarisation PA parallel to disk PA optically thick
Vink et al., 2005b, MNRAS, astro-ph/0502535