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arXiv · 2610.08217

Complex Organic Molecules in Protostars with ALMA Spectral Surveys (COMPASS) II. Approach to data reduction and products for line-rich broadband (sub)millimeter spectra

Adele L. Plunkett·Sébastien Maret·Daniel Harsono·Jes K. Jørgensen·Audrey Coutens·Maria N. Drozdovskaya·Jeong-Eun Lee·Arnaud Belloche·Fernando Cruz-Sáenz de Miera·Merel L. R. van 't Hoff·Jae-Hong Jeong·Chul-Hwan Kim·Ágnes Kóspál·Martine Lützen·Brett A. McGuire·Pooneh Nazari·Silvia Spezzano·Zoie Telkamp·Yao-Lun Yang·Hyeong-Sik Yun·Audrey Andreu·Jennifer Bergner·Judit Ferrer Asensio·Niels F. W. Ligterink·Yuxin Lin·Sheng-Yuan Liu·Pierre Marchand·Mihika Rao·Shaoshan Zeng
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Abstract

Studying the chemical composition of the warm gas surrounding embedded solar-type protostars is one of the areas for which the Atacama Large Millimeter/submillimeter Array (ALMA) is particularly well suited. Recently, the ALMA Large Program ``Complex Organic Molecules in Protostars with ALMA Spectral Surveys'' (COMPASS) carried out an observing campaign of a sample of 11 protostellar regions to investigate the chemical impact of their environments and evolutionary stages. The aim of this paper is to provide the observational and procedural information necessary for the community to understand the analysis presented in forthcoming scientific papers by the COMPASS collaboration, and to enable archival research using the data products provided by our team and the ALMA Science Archive. This paper describes the technical setup of the observations, and it outlines the data-processing pipeline and primary data products from this initiative. The Common Astronomy Software Applications (CASA) was used for initial calibration following the standard ALMA Pipeline, and then IMAGER was used for self-calibration and imaging. We describe post-processing done with Python to achieve favorable continuum subtraction, correct for the primary beam response, and extract spectra. We discuss our strategy for mitigating data challenges, including those related to data volume and continuum subtraction for spectral line analysis. The incorporation of IMAGER in our workflow was advantageous in terms of the computing efficiency which allowed us to benchmark several imaging parameters and techniques; we also demonstrate that the imaging outcomes using IMAGER or CASA are scientifically comparable. Numerous data products are generated for the program, including image cubes for the 36 spectral windows targeting each source, extracted spectra, and continuum images.

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Adele L. Plunkett, Sébastien Maret, Daniel Harsono, Jes K. Jørgensen, Audrey Coutens, Maria N. Drozdovskaya, Jeong-Eun Lee, Arnaud Belloche, Fernando Cruz-Sáenz de Miera, Merel L. R. van 't Hoff, Jae-Hong Jeong, Chul-Hwan Kim, Ágnes Kóspál, Martine Lützen, Brett A. McGuire, Pooneh Nazari, Silvia Spezzano, Zoie Telkamp, Yao-Lun Yang, Hyeong-Sik Yun, Audrey Andreu, Jennifer Bergner, Judit Ferrer Asensio, Niels F. W. Ligterink, Yuxin Lin, Sheng-Yuan Liu, Pierre Marchand, Mihika Rao, Shaoshan Zeng. 2026-10-06. Complex Organic Molecules in Protostars with ALMA Spectral Surveys (COMPASS) II. Approach to data reduction and products for line-rich broadband (sub)millimeter spectra. https://doi.org/10.1051/0004-6361%2F202558751

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