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Deciphering the interplay between starlight and disks: Where is the gas?

Deciphering the interplay between starlight and disks: Where is the gas?. Gerrit van der Plas From disks to planets: Learning from starlight, March 18 th 2009. Protoplanetary disks. - Dust: - Spectral Energy Distribution - Solid state bands - Gas: - H2 - CO

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Deciphering the interplay between starlight and disks: Where is the gas?

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  1. Deciphering the interplay between starlight and disks:Where is the gas? Gerrit van der Plas From disks to planets: Learning from starlight, March 18th 2009

  2. Protoplanetary disks • - Dust: - Spectral Energy Distribution • - Solid state bands • - Gas: - H2 • - CO • - Forbidden line emission ([OI], NeII, -> next talk (Richard Alexander)...) • - PAH

  3. Protoplanetary disks • - Dust: - Spectral Energy Distribution • - Solid state bands • - Gas: - H2 • - CO (fundamental, rovibrational) • - Forbidden line emission ([OI], NeII -> next talk (Richard Alexander), ...) • - PAH Both tracers for the disk atmosphere

  4. [OI]630 nm • FUV photon + OH --> O --> [OI] • Disk atmosphere • COfundamental, ro-vibrational emission • warm (100 – 1000s K) gas • UV fluorescence‏ • Disk + disk atmosphere

  5. Diagnostics • Spectroscopy (Blake & Boogert(2004), Najita et al. (2003), Brittain et al.(2007), ...)‏ • Excitation diagram: Temperature + Column density • kinematic modeling: Inner radius of emission • Astrometry (Pontoppidan et al. (2008), Goto et al. 2006))‏ • Size and offset of emitting region • Milli arc second resolution!

  6. Diagnostics • Spectroscopy (Blake & Boogert(2004), Najita et al. (2003), Brittain et al.(2007), ...)‏ • Excitation diagram: Temperature + Column density • kinematic modeling: Inner radius of emission • Astrometry (Pontoppidan et al. (2008), Goto et al. 2006))‏ • Size and offset of emitting region • Milli arc second resolution!

  7. Astrometry CCD CHIP HD 141569 Spatial direction Wavelength ---> Slit Jaws Shift in the spatial Peak Position (SPP) and FWHM Spatial offset : Size :

  8. Astrometry CCD CHIP HD 141569 Spatial direction Wavelength ---> Shift in the spatial Peak Position (SPP) and FWHM Spatial offset : Size :

  9. HD 97048 HD 100546 Ardila et al. (2007)‏ Star: - B9Vne - 10500 K - 2.4 solar mass - d = 104 pc Disk: - SED: Flaring + disk gap - High crystalline dust content - Abundant PAH emission - Well constrained disk parameters Lagage et al. (2006)‏ Star: - A0sphe - 10000 K - 2.5 solar mass - d = 180 pc Disk: - SED: Flaring - Abundant PAH emission - Well constrained disk parameters

  10. HD 97048 HD 100546 Flux SPP [mas]

  11. HD 97048 HD 100546 Flux SPP [mas]

  12. HD 97048 HD 100546 • CO emission > 8 AU • CO emission > 11 AU Conclusion: Disk gap within 11/8 AU ?

  13. HD 97048 HD 100546 HD 141569 - SED: hot dust - [OI]: tenths to tens of AU (Acke et al. 2006) CO (Brittain et al. 2007)‏ [OI] (Acke et al. 2005)‏ FWHM 154 km/s FWHM 12 km/s

  14. Abundant UV flux OH gas, close to the star ? but no CO emission Warm dust, close to the star

  15. HD 97048 HD 100546 • Gas depletion ? • Radiative transfer ? • CO destruction ?

  16. HD 97048 HD 100546 Flux SPP [mas] - Wide Range of excitation temperatures - Similar kinematics [!] - Similar spatial offset [!]

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