Fifteen Years of Archival ALMA Data as a Survey: A Search for Accretion Streamers in Serpens Main

Accretion streamers are narrow flows of gas that feed young protostars from beyond their natal envelopes. Most have been found by accident, so the community still lacks knowledge on how common they are or how much they matter for protostellar growth. The pilot project presented here tackles this by treating the ALMA Science Archive as a survey instrument. Data taken for other science goals are reprocessed uniformly on CANFAR, at no extra observing cost. Our pilot study of Serpens Main combines 96 datasets from 43 ALMA projects. Of the 59 targets, 43 show continuum emission, and about 20 have extended or asymmetric structure. An automated line search across 945 line cubes produced 5,525 candidate detections. Of the 300 kept after visual review, 228 are in molecules commonly used to trace streamers. We show a few examples of the initial look into the data cubes and give an overview of what the archive's current limitations are for our datasets studied.