The Missing Link of Sulfur Chemistry in TMC-1: The Detection of c-C3H2S from the GOTHAM Survey
Name
Remijan_2025_ApJ_982_191.pdf
Description
Published version
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1.89 MB
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Author(s)
Remijan, Anthony J
Changala, P Bryan
Xue, Ci
Yuan, Elsa QH
Duffy, Miya
Scolati, Haley N
Shingledecker, Christopher N
Speak, Thomas H
Cooke, Ilsa R
Loomis, Ryan
Date Issued
March 28, 2025
Journal
The Astrophysical Journal
Publisher
American Astronomical Society
Citation
Anthony J. Remijan et al 2025 ApJ 982 191
Version
Final published version
Abstract
We present the spectroscopic characterization of cyclopropenethione in the laboratory and detect it in space using the Green Bank Telescope Observations of TMC-1: Hunting Aromatic Molecules survey. The detection of this molecule—the missing link in understanding the C3H2S isomeric family in TMC-1—completes the detection of all three low-energy isomers of C3H2S, as both CH2CCS and HCCCHS have been previously detected in this source. The total column density of this molecule (NT of +5.72 -1.61 102.65 x 10 10 cm−2 at an excitation temperature of 4.7 +1.1 -1.3 K) is smaller than both CH2CCS and HCCCHS and follows nicely the relative dipole principle (RDP), a kinetic rule of thumb for predicting isomer abundances that suggests that, all other chemistry among a family of isomers being the same, the member with the smallest dipole (μ) should be the most abundant. The RDP now holds for the astronomical abundance ratios of both the S-bearing and O-bearing counterparts observed in TMC-1; however, CH2CCO continues to elude detection in any astronomical source.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.3847/1538-4357/adb84c
