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SUMMARY:Radiation-Hydrodynamical Models of X-ray Photoevaporation in Carbo
 n Depleted Circumstellar Discs
DTSTART;VALUE=DATE-TIME:20200512T124500Z
DTEND;VALUE=DATE-TIME:20200512T130500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115619Z
UID:indico-contribution-49@meetings.aip.de
DESCRIPTION:Speakers: Lisa Wölfer (Max-Planck-Institut für extraterrestr
 ische Physik)\nTransition discs provide an important tool to probe various
  mechanisms that might influence the evolution of protoplanetary discs and
  therefore the formation of planetary systems. One of these mechanisms is 
 photoevaporation due to energetic radiation from the central star\, which 
 can in principal explain the occurrence of discs with inner cavities. Curr
 ent models\, however\, fail to reproduce a subset of the observed transiti
 on discs\, namely objects with large measured cavities and vigorous accret
 ion. For these objects the presence of (multiple) giant planets is often i
 nvoked to explain the observations. In our work\, we explore the possibili
 ty of X-ray photoevaporation operating in discs with different gas-phase d
 epletion of carbon and show that the influence of photoevaporation can be 
 extended in such low-metallicity discs. As carbon is one of the main contr
 ibutors to the X-ray opacity\, its depletion leads to larger penetration d
 epths of X-rays in the disc and results in higher gas temperatures and str
 onger photoevaporative winds. We present radiation-hydrodynamical models o
 f discs irradiated by internal X-ray+EUV radiation assuming carbon gas-pha
 se depletions by factors of 3\,10 and 100 and derive realistic mass-loss r
 ates and profiles. Our analysis yields robust temperature prescriptions as
  well as photoevaporative mass-loss rates and profiles which may be able t
 o explain a larger fraction of the observed diversity of transition discs.
 \n\nhttps://meetings.aip.de/event/1/contributions/49/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/1/contributions/49/
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