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Title:TOWARDS LABORATORY LINE LISTS TO SEARCH FOR CH3OD and 13CH3OD IN SPACE
Author(s):Xu, Li-Hong
Contributor(s):Menten, Karl M.; Schlemmer, Stephan; Lewen, Frank; Müller, Holger S. P.; Zakharenko, Olena; Lees, Ronald M.
Subject(s):Astronomy
Abstract:Understanding how, when, and where complex organic and potentially prebiotic molecules are formed is a fundamental goal of astrophysics and astrochemistry and an integral part of origins-of-life studies. The recent images from the Atacama Large Millimeter/submillimeter Array (ALMA) of a potentially planet-forming disk around a young star with an age of only 0.5-1 Myr (million years) have highlighted the importance of the physics and chemistry of the early protostellar stages. A particular focus of ALMA observations is the search for complex molecules in regions of high- and low-mass star formation. Methanol is among the most abundant molecules in star-forming regions, to such an extent that it is considered as an interstellar "weed". Thus, its numerous isotopologues must be accounted for in search for new complex molecules as yet unknown. Here, $\bf{Calculatus Eliminatus}$ approach – "… can help an awful lot. The way to find a missing something is to find out where it's not!" $\footnote{The Cat in the Hat (Video), Dr. Seuss.}$ In other words, if we establish all the knowns, then we can focus on the remaining unknowns. This talk will report progress in our current effort in our on-going journey to pursue the weeding of the cosmos, focusing on CH$_{3}$OD and $^{13}$CH$_{3}$OD. While CH$_{3}$OD is of great interest to a considerable fraction of the radio astronomical community, the significance of $^{13}$CH$_{3}$OD originates from Protostellar Interferometric Line Survey (PILS) $\footnote{J.~K. J{\o}rgensen et al., Astron. Astrophys. 595 (216) 117.}$ of the low-mass protostars IRAS 16291-2422 with ALMA. Here, many lines of CH$_{3}$OH, $^{13}$CH$_{3}$OH and even CH$_{2}$DOH are optically thick, so that the ratio of CH$_{3}$OD to $^{13}$CH$_{3}$OD may serve as a valuable probe of the $^{12}$C/$^{13}$C ratio of methanol. New laboratory measurements obtained at Universit\"{a}t zu K\"{o}ln will be described for: (i) sample mixture of $^{13}$CH$_{3}$OH and CH$_{3}$OD yielding enriched $^{13}$CH$_{3}$OD features from approximately 134 GHz to 510 GHz and (ii) CH$_{3}$OD from approximately 154 GHz to 510 GHz and from 1.12 THz to 1.34 THz.
Issue Date:06/19/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100652
DOI:10.15278/isms.2018.TL02
Other Identifier(s):TL02
Date Available in IDEALS:2018-08-17
2018-12-12


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