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SUMMARY:Elemental chemistry in the inner regions of protoplanetary discs
DTSTART;VALUE=DATE-TIME:20200515T122000Z
DTEND;VALUE=DATE-TIME:20200515T124000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115618Z
UID:indico-contribution-39@meetings.aip.de
DESCRIPTION:Speakers: Pooneh Nazari (Leiden University)\nElemental abundan
 ce ratios in the inner regions of protoplanetary discs are important for s
 etting the composition of exoplanets\, but are likely not to represent the
  bulk composition of the star's parental cloud. Abundance differences are 
 expected to be driven by the differential transport of chemical species in
  solid and gaseous form: elements which are mainly concentrated in species
  with high melting points may be either over-represented in the inner disc
  (due to efficient inward radial drift of icy grains) or else under-repres
 ented (if such grains become trapped in the outer disc).\n\nHere I explore
  a new observational window for determining the relative abundances of C\,
  N and Si in the inner disc through examination of ultraviolet emission li
 nes generated by material accreting onto the central star via an accretion
  column and shock. I use CLOUDY to calculate the resulting ratios of CIV\,
  NV and SiIV lines and how these vary with input elemental abundance ratio
 s. I conclude that such line ratios provide a sensitive probe of abundance
 s in the inner disc and describe the constraints provided by existing HST 
 spectroscopic observations of T Tauri stars.\n\nhttps://meetings.aip.de/ev
 ent/1/contributions/39/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/1/contributions/39/
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