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Journal Article

Water and methanol ice in L 1544

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Giuliano,  B. M.
Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society;

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Caselli,  P.
Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Goto, M., Vasyunin, A. I., Giuliano, B. M., Jiménez-Serra, I., Caselli, P., Román-Zúñiga, C. G., et al. (2021). Water and methanol ice in L 1544. Astronomy and Astrophysics, 651: A53. doi:10.1051/0004-6361/201936385.


Cite as: https://hdl.handle.net/21.11116/0000-0009-2DC0-C
Abstract
Context. Methanol and complex organic molecules have been found in cold starless cores, where a standard warm-up scenario would not work because of the absence of heat sources. A recent chemical model attributed the presence of methanol and large organics to the efficient chemical desorption and a class of neutral-neutral reactions that proceed fast at low temperatures in the gas phase.

Aims. The model calls for a high abundance of methanol ice at the edge of the CO freeze-out zone in cold cloud cores.

Methods. We performed medium-resolution spectroscopy toward three field stars behind the starless core L 1544 at 3 μm to constrain the methanol ice abundance and compare it with the model predictions.

Results. One of the field stars shows a methanol ice abundance of 11% with respect to water ice. This is higher than the typical methanol abundance previously found in cold cloud cores (4%), but is 4.5 times lower than predicted. The reason for the disagreement between the observations and the model calculations is not yet understood.