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Methanol Ice in the Protostar GL 2136

SKINNER, CJ; TIELENS, A; BARLOW, MJ; JUSTTANONT, K; (1992) Methanol Ice in the Protostar GL 2136. Astrophysical Journal Letters , 399 L79-L82. 10.1086/186611. Green open access

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Abstract

We present ground-based spectra in the 10 and 20 micron atmospheric windows of the deeply embedded protostar GL 2136. These reveal narrow absorption features at 9.7 and 8.9 microns, which we ascribe to the CO-stretch and CH3 rock (respectively) of solid methanol in grain mantles. The peak position of the 9.7 micron band implies that methanol is an important ice mantle component. However, the CH3OH/H2O abundance ratio derived from the observed column densities is only 0.1. This discrepancy suggests that the solid methanol and water ice are located in independent grain components. These independent components may reflect chemical differentiation during grain mantle formation and/or partial outgassing close to the protostar.

Type: Article
Title: Methanol Ice in the Protostar GL 2136
Open access status: An open access version is available from UCL Discovery
DOI: 10.1086/186611
Publisher version: https://doi.org/10.1086/186611
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Interstellar Matter; Methyl Alcohol; Molecular Clouds; Protostars; Absorption Spectra; Abundance; Ice; Interstellar Extinction; Stellar Spectra; Astrophysics; ISM: ABUNDANCES; ISM: DUST; EXTINCTION; ISM: INDIVIDUAL ALPHANUMERIC: GL 2136; ISM: MOLECULES
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10096199
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