TY - JOUR
T1 - Organic Complexity in Protostellar Disk Candidates
AU - Bergner, Jennifer B.
AU - Martin-Domenech, Rafael
AU - Oberg, Karin, I
AU - Jorgensen, Jes K.
AU - de la Villarmois, Elizabeth Artur
AU - Brinch, Christian
PY - 2019/8/15
Y1 - 2019/8/15
N2 - We present ALMA observations of organic molecules toward 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 1017-1018 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 2 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.
AB - We present ALMA observations of organic molecules toward 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 1017-1018 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 2 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.
KW - astrochemistry
KW - complex organic molecules
KW - hot corinos
KW - low-mass protostars
KW - interstellar medium
U2 - 10.1021/acsearthspacechem.9b00059
DO - 10.1021/acsearthspacechem.9b00059
M3 - Journal article
SN - 2472-3452
VL - 3
SP - 1564
EP - 1575
JO - ACS Earth and Space Chemistry
JF - ACS Earth and Space Chemistry
IS - 8
ER -