Preparatory observations VLT - VLT-ISAAC survey of ~50 Class I YSO’s -- Low resolution (R~600) L-band - Medium resolution (R~10000) M-band - Other programs Ewine van Dishoeck c2d meeting dec. 11, 2002
Spectra embedded sources Gibb et al SIRTF R~600 only at >10 m => ground-based high resolution in 3-5 m range
Ophiuchus sources - Strong solid CO - Gas-phase CO in absorption or emission - narrow and broad lines Pontoppidan et al. 2002
Ophiuchus (cont’d) Note fit of all spectra with just 3 components
Serpens sources
Orion sources Note shallow absorption at 2175 cm -1 : not OCN -
R CrA sources
Chamaeleon sources
Vela sources/L1489 in Taurus
CO gas / solid low-mass YSOs RE50 TPSC78 CO co-exists in gas phase and solid state Different objects show different ratios of gas:ice, related to their evolution Observed line profiles provide clues to structure ices by comparison with lab data Pontopidan, et. al., A&A, (2002), in prep VLT-ISAAC large program
Detection of abundant solid CO in an edge-on circumstellar disk VLT-ISAAC K’ VLT-ISAAC Thi, Pontoppidan, vD et al Solid CO
Additional data ESO-TIMMI m R~200 (with Waters + MPIA-Heidelberg); brightest sources only to check variability OVRO imaging embedded sources (with Geoff) VLT-VISIR 8-13 m, m, R~10 4 ; commissioning summer 2003, follow-up bright sources for gas species JCMT-SCUBA maps of cores (see Neal’s talk)