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SUMMARY:Fifteen Years of Archival ALMA Data as a Survey: A Search for Accr
 etion Streamers in Serpens Main
DTSTART;VALUE=DATE-TIME:20261028T181500Z
DTEND;VALUE=DATE-TIME:20261028T181600Z
DTSTAMP;VALUE=DATE-TIME:20261028T014910Z
UID:indico-contribution-3711@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Samuel Fielder (University of Victoria)\nProtostella
 r accretion streamers are coherent filamentary structures that channel mat
 erial from envelope scales and beyond into protostellar cores. Largely fou
 nd serendipitously\, streamers have emerged as a potentially important yet
  poorly characterized mode of mass assembly in early star formation\, with
  occurrence rates\, class dependence\, and environmental dependence still 
 unconstrained. ALMA-SAILS (ALMA Search for Asymmetry and Infall at Large S
 cales) addresses this by treating nearly 15 years of the ALMA Science Arch
 ive as a survey. Data taken for other science goals are uniformly reproces
 sed on CANFAR into a single\, self-consistent dataset at no additional obs
 erving cost. Our pilot study targets Serpens Main\, combining 96 datasets 
 from 43 ALMA projects (Bands 3–8\, Cycles 2–11). Uniform self-calibrat
 ion and imaging yields ~200 continuum images across 59 targets. Emission i
 s detected toward 43 of them. About 20 (47%) show extended or asymmetric s
 tructure rather than a compact core\, and ~10 exhibit extended features 
 ≥2000 au\, which suggests infall from beyond the dense core. Cross-match
 ing with protostellar catalogs lets us compare candidate fractions across 
 evolutionary stages. Since continuum morphology cannot confirm infall\, we
  also run automated line identification across 881 line-bearing spectral w
 indows. We confirm 112 detections of dense-gas and infall tracers toward 2
 4 sources. We present our first kinematic results toward the strongest can
 didates\, using SCOUSE and ACORNS to isolate coherent velocity structures\
 , while noting a key limit of archival data: over a third of spectral wind
 ows are too coarse (>5 km/s) to resolve streamer velocity gradients.\n\nht
 tps://nyx.physics.mcgill.ca/event/587/contributions/3711/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3711/
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