The exoALMA Large Program was designed to search for subtle kinematic deviations from Keplerian motion, indicative of embedded planets, in high angular and spectral resolution Band 7 observations of 12CO, 13CO and CS emission from protoplanetary disks. This paper summarizes the calibration and imaging pipelines used by the exoALMA collaboration. With sources ranging in diameter from 2.4" to 13.8" when probed by 12CO, multiple antennae configurations were required to maximally recover all spatial information (including the ACA for 7 sources). Combining these datasets warranted particular care in their alignment during calibration and prior to imaging, so as not to introduce spurious features that might resemble the kinematic deviations being investigated. Phase decoherence was found in several datasets, which was corrected by an iterative self-calibration procedure, and we explored the effects of the order of operations of spatial alignment, flux scaling, and self-calibration. A number of different imaging sets were produced for the continuum and line emission, employing an iterative masking procedure that minimizes bias due to non-Keplerian motions in the disk.
@article{arxiv.2504.19870,
title = {exoALMA II: Data Calibration and Imaging Pipeline},
author = {Ryan A. Loomis and Stefano Facchini and Myriam Benisty and Pietro Curone and John D. Ilee and Gianni Cataldi and Hsi-Wei Yen and Richard Teague and Christophe Pinte and Jane Huang and Himanshi Garg and Ryuta Orihara and Ian Czekala and Brianna Zawadzki and Sean M. Andrews and David J. Wilner and Jaehan Bae and Marcelo Barraza-Alfaro and Daniele Fasano and Mario Flock and Misato Fukagawa and Maria Galloway-Sprietsma and Andres F. Izquierdo and Kazuhiro Kanagawa and Geoffroy Lesur and Cristiano Longarini and Francois Menard and Daniel J. Price and Giovanni Rosotti and Jochen Stadler and Gaylor Wafflard-Fernandez and Lisa Wolfer and Tomohiro C. Yoshida},
journal= {arXiv preprint arXiv:2504.19870},
year = {2025}
}
Comments
24 pages, 10 figures. This paper is accepted as part of the exoALMA Focus Issue of The Astrophysical Journal Letters