Organic Complexity In Protostellar Disk Candidates

By Keith Cowing
Press Release
July 21, 2019
Filed under
Organic Complexity In Protostellar Disk Candidates
Protostellar Disk

We present ALMA observations of organic molecules towards five low-mass Class 0/I protostellar disk candidates in the Serpens cluster.

Three sources (Ser-emb 1, Ser-emb 8, and Ser-emb 17) present emission of CH3OH as well as CH3OCH3, CH3OCHO, and CH2CO, while NH2CHO is detected in just Ser-emb 8 and Ser-emb 17. Detecting hot corino-type chemistry in three of five sources represents a high occurrence rate given the relative sparsity of these sources in the literature, and this suggests a possible link between protostellar disk formation and hot corino formation. For sources with CH3OH detections, we derive column densities of 10^{17}-10^{18} cm^{-2} and rotational temperatures of ~200-250 K. The CH3OH-normalized column density ratios of large, oxygen-bearing COMs in the Serpens sources and other hot corinos span two orders of magnitude, demonstrating a high degree of chemical diversity at the hot corino stage. Resolved observations of a larger sample of objects are needed to understand the origins of chemical diversity in hot corinos, and the relationship between different protostellar structural elements on disk-forming scales.

Jennifer B. Bergner, Rafael Martin-Domenech, Karin I. Oberg, Jes K. Jorgensen, Elizabeth Artur de la Villarmois, Christian Brinch
(Submitted on 17 Jul 2019)

Comments: Accepted to ACS Earth & Space Chemistry
Subjects: Solar and Stellar Astrophysics (astro-ph.SR); Astrophysics of Galaxies (astro-ph.GA)
DOI: 10.1021/acsearthspacechem.9b00059
Cite as: arXiv:1907.07791 [astro-ph.SR] (or arXiv:1907.07791v1 [astro-ph.SR] for this version)
Submission history
From: Jennifer Bergner
[v1] Wed, 17 Jul 2019 22:05:16 UTC (5,734 KB)
Astrobiology, Astrochemistry

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