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Processed and Unprocessed Ices in Circumstellar Disks

Published online by Cambridge University Press:  30 March 2016

Klaus Pontoppidan
Affiliation:
Leiden Observatory, P. 0. Box 9513, 2300 RA Leiden, Netherlands
Ewine van Dishoeck
Affiliation:
Leiden Observatory, P. 0. Box 9513, 2300 RA Leiden, Netherlands
Emmanuel Dartois
Affiliation:
IAS, Bât 121, Université Paris XI, 91405 Orsay Cedex, France
Wing-Fai Thi
Affiliation:
Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, Netherlands

Abstract

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We present 3-5 µm VLT-ISAAC spectroscopy showing the presence of methanol ices in edge-on disks of young embedded stars. Examples include the disks of L1489 IRS in Taurus and CRBR 2422.8-3423 in Ophiuchus, the last of which has the highest column density of solid CO known toward a YSO. Several additional low-mass sources in the Serpens and Chameleon molecular clouds exhibit abundant solid methanol although it is not clear if the ice is associated with a disk or with the envelope. These are the first detections of solid methanol in the disks and circumstellar environments of embedded young low-mass stars providing evidence that complex molecular species previously observed only in the solid state toward high-mass star forming regions are also present near solar-type young stars. The constraints on the formation mechanisms of methanol and the chemical evolution of ices as the material is incorporated into circumstellar disks are discussed.

Type
I. Joint Discussions
Copyright
Copyright © Astronomical Society of Pacific 2005

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