Water and Methanol Ice in L1544
- Author(s)
- Miwa Goto, A. I. Vasyunin, B. M. Giuliano, I. Jiménez-Serra, P. Caselli, C. G. Román-Zúñiga, J. Alves
- 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.- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Ludwig-Maximilians-Universität München, Ural Federal University, Ventspils University of Applied Sciences, Max-Planck-Institut für extraterrestrische Physik, National Institute of Aerospace Technology, Universidad Nacional Autonoma de Mexico
- Journal
- Astronomy & Astrophysics
- Volume
- 651
- No. of pages
- 8
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361/201936385
- Publication date
- 07-2021
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Keywords
- ASJC Scopus subject areas
- Astronomy and Astrophysics, Space and Planetary Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/8392e605-20d4-471d-bebf-1c33e8b77f1f