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SUMMARY:From Starless Cores to Embedded Disks: Chemistry and Fragmentation
  in Early Star Formation
DTSTART;VALUE=DATE-TIME:20261028T181600Z
DTEND;VALUE=DATE-TIME:20261028T181700Z
DTSTAMP;VALUE=DATE-TIME:20261025T100810Z
UID:indico-contribution-3683@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Rajeeb Sharma (Herzberg Astronomy and Astrophysics)\
 nThe physical and chemical conditions present during planet formation are 
 established during the earliest embedded Class 0/I phases of star formatio
 n. At this stage\, protostellar systems are still being shaped by infall\,
  outflows\, irradiation\, and chemical processing. Understanding how these
  processes set the initial conditions for star and planet formation requir
 es observations that can resolve the small-scale structures within embedde
 d systems. We present the first systematic high-angular resolution (0.1”
 \, ~15 au) study of disk-scale chemistry in 19 nearby embedded protostars 
 as part of the ALMA Large Program eDisk. Using multiple molecular tracers\
 , we identify the distinct morphologies within these young systems. $^{12}
 $CO and SiO trace outflows and jets\, while $^{13}$CO and C$^{18}$O trace 
 rotating inner envelope and disk regions. The compact hot core regions are
  traced by DCN and CH$_{3}$OH\, and are particularly prominent towards the
  youngest Class 0 sources. Hydrocarbons are associated with UV-irradiated 
 outflow cavity walls\, while SO and H$_{2}$CO show complex morphology\, tr
 acing various structures that include non-axisymmetric infall through stre
 amers. Recently\, we are using archival ALMA observations to investigate f
 ragmentation in dense starless cores. This complementary study probes the 
 structures that precede protostellar formation and will help connect the i
 nitial fragmentation of dense cores with the physical and chemical complex
 ity observed in young embedded systems. Together\, these efforts will prov
 ide a more complete view of the initial conditions of star and planet form
 ation.\n\nhttps://nyx.physics.mcgill.ca/event/587/contributions/3683/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3683/
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