Laboratory Experiments of Condensed-phase Acetylene Mixtures with Astrophysical Applications

Details Laboratory Experiments of Condensed-phase Acetylene Mixtures with Astrophysical Applications Laboratory Experiments of Condensed-phase Acetylene Mixtures with Astrophysical Applications

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21440206k&link_type=abstract

American Astronomical Society, AAS Meeting #214, #402.06; Bulletin of the American Astronomical Society, Vol. 41, p.663

Biology

Scientific paper

Studies of molecular hot cores and proto-stellar environments have shown that there are some chemical enhancements of molecules due to the newly heated material. In particular, acetylene (C2H2) has been observed toward various proto-stars with column densities as high as 1016 cm-2. Chemical models try to reproduce the observed column densities, but the observed values cannot be matched from acetylene production only via gas phase reactions. Models that assume some icy acetylene component on grain mantles are able to produce the observed values of gas phase acetylene. While it may be possible that some acetylene is sublimating from grain mantles, there has been no direct observations of acetylene ice features on grains. In the Cosmic Ice Laboratory at the NASA Goddard Space Flight Center, we have studied the changes to the infrared spectrum of condensed-phase acetylene as a function of temperature and as a function of concentration. We present the results of these experiments for various binary ice mixtures of acetylene mixed with water, carbon monoxide, carbon dioxide, and methane. We explore the relation between concentration and peak position of the acetylene features. In addition, we explore changes in the features of the other molecules in the presence of acetylene. Funding from the Goddard Center for Astrobiology is acknowledged.

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