Chemical Evolution Of Some Selected Complex Organic Molecules In Low-mass Star-forming Regions

By Keith Cowing
Status Report
August 21, 2023
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Chemical Evolution Of Some Selected Complex Organic Molecules In Low-mass Star-forming Regions
Abundances of the COMs at the different evolutionary stages of low-mass star-forming regions. — astro-ph.GA

The destiny of complex organic molecules (COMs) in star-forming regions is interlinked with various evolutionary phases. Therefore, identifying these species in diversified environments of identical star-forming regions would help to comprehend their physical and chemical heritage.

We identified multiple COMs utilizing the Large Program `Astrochemical Surveys At IRAM’ (ASAI) data, dedicated to chemical surveys in Sun-like star-forming regions with the IRAM 30 m telescope. It was an unbiased survey in the millimetre regime, covering the prestellar core, protostar, outflow region, and protoplanetary disk phase.

Here, we have reported some transitions of seven COMs, namely, methanol (CH3OH), acetaldehyde (CH3CHO), methyl formate (CH3OCHO), ethanol (C2H5OH), propynal (HCCCHO), dimethyl ether (CH3OCH3), and methyl cyanide (CH3CN) in some sources L1544, B1-b, IRAS4A, and SVS13A. We found a trend among these species from the derived abundances using the rotational diagram method and MCMC fit.

We have found that the abundances of all of the COMs, except for HCCCHO, increase from the L1544 (prestellar core) and peaks at IRAS16293-2422 (class 0 phase). It is noticed that the abundance of these molecules correlate with the luminosity of the sources. The obtained trend is also visible from the previous interferometric observations and considering the beam dilution effect.

Bratati Bhat, Rumela Kar, Suman Kumar Mondal, Rana Ghosh, Prasanta Gorai, Takashi Shimonishi, Kei E. I. Tanaka, Kenji Furuya, Ankan Das

Comments: 44 pages, 25 figures, and 12 tables. Accepted for the publication in the Astrophysical Journal
Subjects: Solar and Stellar Astrophysics (astro-ph.SR); Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:2308.10211 [astro-ph.SR] (or arXiv:2308.10211v1 [astro-ph.SR] for this version)
Submission history
From: Ankan Das
[v1] Sun, 20 Aug 2023 09:33:45 UTC (1,459 KB)
Astrobiology, Astrochemistry,

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻