1. 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

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

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

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

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

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

7. Astrometry CCD CHIP S hift in the spatial P eak P osition ( SPP ) and FWHM HD 141569 Wavelength ---> Spatial offset : Size : Spatial direction Slit Jaws

8. S hift in the spatial P eak P osition ( SPP ) and FWHM HD 141569 Wavelength ---> Spatial offset : Size : Spatial direction Astrometry CCD CHIP

9. HD 97048HD 100546 Star:- A0sphe - 10000 K - 2.5 solar mass - d = 180 pc Disk: - SED: Flaring - Abundant PAH emission - Well constrained disk parameters Lagage et al. (2006)‏ 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 Ardila et al. (2007)‏

10. HD 97048HD 100546 SPP [mas] Flux

11. HD 97048HD 100546 SPP [mas] Flux

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

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

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

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

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