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SUMMARY:Locating the water snowline in protoplanetary disks using the chem
 ical tracer H13CO+
DTSTART;VALUE=DATE-TIME:20200515T115500Z
DTEND;VALUE=DATE-TIME:20200515T121500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115618Z
UID:indico-contribution-62@meetings.aip.de
DESCRIPTION:Speakers: Margot Leemker (Leiden University)\nSnowlines\, in p
 articular the water snowline\, are important for the formation of planets 
 in protoplanetary disks. However\, locating the water snowline directly is
  challenging. Firstly\, due to the proximity of the water snowline to the 
 host star. But ALMA can now resolve this region for the first time. Second
 ly\, due to the absorption of water in the Earth's atmosphere. A chemical 
 tracer\, HCO+\, provides a solution to the latter problem. HCO+ is destroy
 ed by gas-phase water\, therefore no HCO+ is expected to be present when w
 ater desorps from the grains. It has already been shown by van 't Hoff et 
 al. (2018) that the optically thin isotopologue\, H13CO+\, acts as a trace
 r of the water snowline in the envelope around a Class 0 object. We invest
 igate whether this also works in Class 2 objects where planets form. The H
 CO+ abundance is modeled using our small chemical network and using the de
 nsity and temperature structure from a DALI model. The expected emission i
 s modeled for different transitions of H13CO+. I will discuss how well H13
 CO+ traces the water snowline in disks. We can already confirm that the HC
 O+ abundance drops when water desorps from the grains and I will discuss w
 hat observations are needed to locate the water snowline with ALMA.\n\nhtt
 ps://meetings.aip.de/event/1/contributions/62/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/1/contributions/62/
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