ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP). I. Detection of New Hot Corinos with the ACA

Shih Ying Hsu, Sheng Yuan Liu, Tie Liu, Dipen Sahu, Naomi Hirano, Chin Fei Lee, Ken'ichi Tatematsu, Gwanjeong Kim, Mika Juvela, Patricio Sanhueza, Jinhua He, Doug Johnstone, Sheng Li Qin, Leonardo Bronfman, Huei Ru Vivien Chen, Somnath Dutta, David J. Eden, Kai Syun Jhan, Kee Tae Kim, Yi Jehng KuanWoojin Kwon, Chang Won Lee, Jeong Eun Lee, Anthony Moraghan, M. G. Rawlings, Hsien Shang, Archana Soam, M. A. Thompson, Alessio Traficante, Yuefang Wu, Yao Lun Yang, Qizhou Zhang

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We report the detection of four new hot corino sources, G211.47-19.27S, G208.68-19.20N1, G210.49-19.79W, and G192.12-11.10, from a survey study of Planck Galactic Cold Clumps in the Orion Molecular Cloud Complex with the Atacama Compact Array. Three sources had been identified as low-mass Class 0 protostars in the Herschel Orion Protostar Survey. One source in the λ Orionis region is first reported as a protostellar core. We have observed abundant complex organic molecules (COMs), primarily methanol but also other oxygen-bearing COMs (in G211.47-19.27S and G208.68-19.20N1) and the molecule of prebiotic interest NH2CHO (in G211.47-19.27S), signifying the presence of hot corinos. While our spatial resolution is not sufficient to resolve most of the molecular emission structure, the large line width and high rotational temperature of COMs suggest that they likely reside in the hotter and innermost region immediately surrounding the protostar. In G211.47-19.27S, the D/H ratio of methanol ([CH2DOH]/[CH3OH]) and the 12C/13C ratio of methanol ([CH3OH]/[13CH3OH]) are comparable to those of other hot corinos. Hydrocarbons and long-carbon-chain molecules such as c-C3H2 and HCCCN are also detected in the four sources, likely tracing the outer and cooler molecular envelopes.

    Original languageEnglish
    Article number107
    JournalAstrophysical Journal
    Volume898
    Issue number2
    DOIs
    Publication statusPublished - 2020 Aug 1

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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