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SUMMARY:Synthetic ALMA emission of massive protostellar discs.
DTSTART;VALUE=DATE-TIME:20200514T142000Z
DTEND;VALUE=DATE-TIME:20200514T144000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115620Z
UID:indico-contribution-35@meetings.aip.de
DESCRIPTION:Speakers: Dominique Meyer (University of Potsdam)\nMassive pro
 tostellar discs are the sibling circumstellar structures of protoplanetary
  accretion discs.  They form\, evolve as a scaled-up version of the surrou
 ndings of low-mass stars and both formation mechanisms are unified within 
 the so-called burst mode of star formation. This picture naturally links t
 he development of gravitational instabilities in centrifugally balanced ac
 cretion discs to the formation of gaseous clumps and stellar companions wh
 ich will influence the future evolution of massive protostars in the Hertz
 sprung–Russell diagram. We perform molecular line emission plus dust con
 tinuum radiative transfer calculations and compute synthetic images of dis
 c structures modelled by the gravito-radiation-hydrodynamics simulation of
  a forming stars\, in order to investigate the Atacama Large Millimeter/su
 bmillimeter Array (ALMA) observability of circumstellar gaseous clumps and
  forming multiple systems. We show that substructures are observable regar
 dless of their viewing geometry or can be inferred in the case of an edge-
 viewed disc. The observation probability of the clumps increases with the 
 gradually increasing efficiency of gravitational instability at work as th
 e disc evolves. Our results motivate further observational campaigns devot
 ed to massive accretion discs as around the protostars S255IR-NIRS3 and NG
 C 6334I-MM1\, whose recent outbursts are a probable signature of disc frag
 mentation and accretion variability.\n\nhttps://meetings.aip.de/event/1/co
 ntributions/35/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/1/contributions/35/
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