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Unravelling the Chemical Structure of Young Stellar Objects with ALMA

van Dishoeck, E. F. and Blake, G. A. (2001) Unravelling the Chemical Structure of Young Stellar Objects with ALMA. In: Science with the Atacama Large Millimeter Array (ALMA). Astronomical Society of the Pacific Conference Series. Vol.235. Astronomical Society of the Pacific , San Francisco, California, pp. 89-98. ISBN 1-58381-072-2.

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The importance of ALMA to quantitatively trace the evolution of gas and dust from interstellar clouds to planetary systems is discussed and illustrated with recent observational studies of molecules in low- and high-mass young stellar objects. Line surveys using single-dish submillimeter telescopes reveal large chemical variations between different sources, which are likely related to their evolutionary state. A chemical scenario is presented in which molecules produced by grain-surface chemistry during the cold collapse phase are returned to the gas once the young star has formed, leading to an active high-temperature gas-phase chemistry. Both thermal evaporation and release of icy mantles in shocks plays a role. Current observational facilities lack the spatial resolution and image quality to distinguish these different physical and chemical regimes. Exploratory observations of the excitation and distribution of molecules in circumstellar disks are presented, but only ALMA can study the chemistry in the planet-forming zones of circumstellar disks.

Item Type:Book Section
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URLURL TypeDescription
van Dishoeck, E. F.0000-0001-7591-1907
Blake, G. A.0000-0003-0787-1610
Additional Information:© 2001 Astronomical Society of the Pacific. The authors are grateful to N.J. Evans, M.R. Hogerheijde, L.G. Mundy, C. Qi, and F. van der Tak for discussions, collaborations and figures. This work was supported by NWO grant 614.41.003 and by NASA grants NAG5-4383 and -8822.
Funding AgencyGrant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)614.41.003
Series Name:Astronomical Society of the Pacific Conference Series
Record Number:CaltechAUTHORS:20120919-155337978
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34242
Deposited By: Jason Perez
Deposited On:19 Sep 2012 23:59
Last Modified:03 Oct 2019 04:17

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