Ices in Star-Forming Regions: First Results from VLT-ISAAC
E. F. van Dishoeck, E. Dartois, W. F. Thi, L. d'Hendecourt, A. G. G. M. Tielens, P. Ehrenfreund, W. A. Schutte, K. Pontoppidan, K. Demyk, J. Keane, A. C. A. Boogert
Abstract
The first results from a VLT-ISAAC program on L- and M-band infrared spectroscopy of deeply-embedded young stellar objects are presented. The advent of 8-m class telescopes allows high S/N spectra of low-luminosity sources to be obtained. In our first observing run, low- and medium-resolution spectra have been measured toward a dozen objects, mostly in the Vela and Chamaeleon molecular clouds. The spectra show strong absorption of H2O and CO ice, as well as weak features at `3.47' and 4.62 mu. No significant solid CH3OH feature at 3.54 mu is found, indicating that the CH3OH/H2O ice abundance is lower than toward some massive protostars. Various evolutionary diagnostics are investigated for a set of sources in Vela.
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