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SUMMARY:Global axisymmetric simulations of photoevaporation and magnetical
 ly driven protoplanetary disk winds
DTSTART;VALUE=DATE-TIME:20200512T115500Z
DTEND;VALUE=DATE-TIME:20200512T121500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115618Z
UID:indico-contribution-21@meetings.aip.de
DESCRIPTION:Speakers: Peter Rodenkirch (Institute for Theoretical Astrophy
 sics Heidelberg)\nPhotoevaporation and magnetically driven winds are two i
 ndependent mechanisms that remove mass from protoplanetary disks. In addit
 ion to accretion\, the effect of these two principles acting concurrently 
 could be significant\, and the transition between them has not yet been ex
 tensively studied and quantified. \nIn order to contribute to the understa
 nding of disk winds\, we present the phenomena emerging in the framework o
 f two-dimensional axisymmetric\, nonideal magnetohydrodynamic simulations 
 including extreme-ultraviolet (EUV) and X-ray driven photoevaporation. Of 
 particular interest are the examination of the transition region between p
 hotoevaporation and magnetically driven wind\, the possibility of emerging
  magnetocentrifugal wind effects\, and the morphology of the wind itself\,
  which depends on the strength of the magnetic field. \nWe used the PLUTO 
 code in a two-dimensional axisymmetric configuration with additional treat
 ment of EUV and X-ray heating and dynamic ohmic diffusion based on a semi-
 analytical chemical model. \nWe determine that the transition between the 
 two outflow types occurs for values of the initial plasma beta β ≥ 107\
 , while magnetically driven winds generally outperform photoevaporation fo
 r stronger fields. In our simulations we observe irregular and asymmetric 
 outflows for stronger magnetic fields. In the weak-field regime\, the phot
 oevaporation rates are slightly lowered by perturbations of the gas densit
 y in the inner regions of the disk. Overall\, our results predict a wind w
 ith a lever arm smaller than 1.5\, consistent with a hot magnetothermal wi
 nd. Stronger accretion flows are present for values of β \n\nhttps://meet
 ings.aip.de/event/1/contributions/21/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/1/contributions/21/
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