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Title:Individual Detections Of Polycyclic Aromatic Hydrocarbons In Tmc-1
Author(s):Burkhardt, Andrew M.
Contributor(s):McGuire, Brett A.; McCarthy, Michael C.; Herbst, Eric; Charnley, Steven B; Wei, Hongji; Loomis, Ryan A; Cooke, Ilsa Rose; Shingledecker, Christopher N.; Changala, Bryan; Lee, Kelvin
Abstract:Polycyclic Aromatic Hydrocarbons (PAHs) have long been invoked in the study of interstellar and protostellar sources, but the unambiguous identification of any single PAH has proven elusive until very recently. As a result, the formation mechanism for this important class of molecules remains poorly constrained. Here, we will discuss the dedicated and sustained effort to explore the aromatic content in the ISM at radio wavelengths with the GOTHAM (GBT Observations of TMC-1: Hunting for Aromatic Molecules) survey. We will focus on the first interstellar detection of a pure PAH, indene (\chem{C_9H_8}), and how it fits within the context of the other recently detected cyclic molecules, including the cyanonaphthalenes (1- and 2-\chem{C_{10}H_7CN}). Indene is found to be the most abundant organic ring detected in TMC-1 to date and is more abundant than predictions from astrochemical modeling with NAUTILUS by several orders of magnitude. This detection provides a new avenue of chemical inquiry where hydrocarbon abundances can now be directly compared to those of closely-related but CN-functionalized rings and creates a strong motivation to search for these species' cyano or pure ring counterparts.
Issue Date:2021-06-22
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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