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SUMMARY:Finding Young Stars in the Noise: A Multi-Wavelength Detection and
  Classification Algorithm for Young Stellar Objects
DTSTART;VALUE=DATE-TIME:20261028T182300Z
DTEND;VALUE=DATE-TIME:20261028T182400Z
DTSTAMP;VALUE=DATE-TIME:20261026T232634Z
UID:indico-contribution-3653@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Luke Sacco (University of Toronto/University of Hert
 fordshire)\nYoung Stellar Objects (YSOs) range from the beginning of star 
 formation (protostars) up until the beginning of the main sequence (T Taur
 i stars). By looking at the inception of the formation process\, we can ga
 in insight into stellar evolution\, star-forming regions and their structu
 res\, and the motion of stars and surrounding matter. Using the Orion star
 -forming complex as a primary testing ground\, we build an algorithm desig
 ned to detect YSOs and their evolutionary subclasses in arbitrary regions 
 of the sky. The algorithm combines near-infrared photometry from 2MASS\, s
 oft X-ray detections from eROSITA DR1\, astrometric measurements from Gaia
  DR3\, MIST isochrones\, and mid-infrared photometry from AllWISE and\, wh
 ere available\, Spitzer SEIP. Mid-infrared YSO selection follows the Koeni
 g & Leisawitz (2014) and Gutermuth et al. (2009) schemes\, with Spitzer ta
 king priority over WISE when classifiable data are available. Candidate po
 pulations from infrared\, X-ray\, and Gaia branches are merged and assesse
 d using complementary youth indicators. Across six independent star-formin
 g clouds\, the final mid-infrared classifier recovered approximately 82% o
 f YSOs with sufficient photometry for classification. For Class 0/I protos
 tars\, conditional recovery reached 69.8%\, while classification agreement
  among recovered protostars and Class II sources was approximately 95%. Mo
 st missed protostars were limited by catalogue availability or unclassifia
 ble photometry rather than colour-selection failure. These results demonst
 rate both the effectiveness of literature-based infrared classification wh
 en suitable data are available and the importance of combining complementa
 ry youth diagnostics to construct a portable\, all-sky YSO-selection algor
 ithm.\n\nhttps://nyx.physics.mcgill.ca/event/587/contributions/3653/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3653/
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