Slide 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 Slide 2 - Dust: - Spectral Energy Distribution - Solid state bands - Gas: - H2 - CO - Forbidden line emission ([OI], NeII, -> next talk (Richard Alexander)...) - PAH Protoplanetary disks Slide 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 Slide 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 Slide 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! Slide 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! Slide 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 Slide 8 S hift in the spatial P eak P osition ( SPP ) and FWHM HD 141569 Wavelength ---> Spatial offset : Size : Spatial direction Astrometry CCD CHIP Slide 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) Slide 10 HD 97048HD 100546 SPP [mas] Flux Slide 11 HD 97048HD 100546 SPP [mas] Flux Slide 12 CO emission > 11 AU CO emission > 8 AU Conclusion: Disk gap within 11/8 AU ? HD 97048HD 100546 Slide 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 Slide 14 Warm dust, close to the star OH gas, close to the star Abundant UV flux but no CO emission ? Slide 15 HD 97048HD 100546 Gas depletion ? Radiative transfer ? CO destruction ? Slide 16 HD 97048HD 100546 - Wide Range of excitation temperatures - Similar kinematics [!] - Similar spatial offset [!] SPP [mas] Flux