Methanol in the Circumstellar Envelope of IRC +10°216
TL;DR: In this paper, the rotational transitions of methanol were identified with millimeter-wave observations of the extremely carbon-rich circumstellar envelope of IRC +10°216, and it was argued that shock chemistry, ion-molecule reactions, and grain surface reactions might all be potential sources of circumstellar methanols.
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Abstract: Millimeter-wave observations of the extremely carbon-rich circumstellar envelope of IRC +10°216 show several emission lines that we identify with rotational transitions of methanol. We describe our observations and the reasoning that led to this identification. We argue that shock chemistry, ion-molecule reactions, and grain surface reactions might all be potential sources of circumstellar methanol. Each of these pathways either requires or produces H2O in the envelope of IRC +10°216.
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Citations
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Condensation calculations in circumstellar shells for different C/O ratios.
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