Methanol ice in the protostar GL 2136

Details Methanol ice in the protostar GL 2136 Methanol ice in the protostar GL 2136

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399l..79s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 399, no. 1, p. L79-L82.

Astronomy and Astrophysics

Astrophysics

77

Interstellar Matter, Methyl Alcohol, Molecular Clouds, Protostars, Absorption Spectra, Abundance, Ice, Interstellar Extinction, Stellar Spectra

Scientific paper

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.

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