1. 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

2. Spectra embedded sources Gibb et al. 2000 SIRTF R~600 only at >10  m => ground-based high resolution in 3-5  m range

3. Ophiuchus sources - Strong solid CO - Gas-phase CO in absorption or emission - narrow and broad lines Pontoppidan et al. 2002

4. Ophiuchus (cont’d) Note fit of all spectra with just 3 components

5. Serpens sources

6. Orion sources Note shallow absorption at 2175 cm -1 : not OCN -

7. R CrA sources

8. Chamaeleon sources

9. Vela sources/L1489 in Taurus

10. 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

11. Detection of abundant solid CO in an edge-on circumstellar disk VLT-ISAAC K’ VLT-ISAAC Thi, Pontoppidan, vD et al. 2002 Solid CO

12. Additional data ESO-TIMMI2 8-13  m R~200 (with Waters + MPIA-Heidelberg); brightest sources only to check variability OVRO imaging embedded sources (with Geoff) VLT-VISIR 8-13  m, 17-22  m, R~10 4 ; commissioning summer 2003, follow-up bright sources for gas species JCMT-SCUBA maps of cores (see Neal’s talk)