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SUMMARY:Disk Spreading and Surface Accretion Flows in Protoplanetary Disks
DTSTART;VALUE=DATE-TIME:20200512T070000Z
DTEND;VALUE=DATE-TIME:20200512T072000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115618Z
UID:indico-contribution-7@meetings.aip.de
DESCRIPTION:Speakers: Joan Najita (National Optical-Infrared Astronomy Res
 earch Laboratory)\nDespite its importance for star and planet formation\, 
 the physical process(es) that drive disk accretion remain frustratingly un
 clear. The magnetorotational instability is questioned both theoretically 
 and observationally and disk winds are increasingly invoked. I will descri
 be how the evolution of gas disk sizes from Class I to Class II indicates 
 that some mechanism produces significant disk spreading (i.e.\, angular mo
 mentum transport within the disk) during the Class II phase. I will also s
 how results from high resolution mid-infrared spectroscopy of a Class I so
 urce that may provide evidence for an alternative angular momentum transpo
 rt mechanism\, “surface accretion flows\,” which have been reported in
  MHD simulations of magnetized disks.\n\nhttps://meetings.aip.de/event/1/c
 ontributions/7/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/1/contributions/7/
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