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SUMMARY:The time variable dynamics of snow-lines
DTSTART;VALUE=DATE-TIME:20200515T091000Z
DTEND;VALUE=DATE-TIME:20200515T093000Z
DTSTAMP;VALUE=DATE-TIME:20241101T160808Z
UID:indico-contribution-31@meetings.aip.de
DESCRIPTION:Speakers: James Owen (Imperial College London)\nSnow-lines are
  regions of protoplanetary discs where volatiles transition from the solid
 -phase to the gas phase. They play an important role in the chemical evolu
 tion of protoplanetary discs and perhaps planet/planetesimal formation. Th
 e majority of work treats these transitions as passive\, uncoupled from th
 e dynamics. I will argue that snow-lines in the outer regions of protoplan
 etary discs (where the dis cooling is optically thin)\, are thermally unst
 able. Namely\, condensation leads to an increase in the solid abundance wh
 ich leads to increased cooling and more condensation (or vica-versa). I wi
 ll demonstrate a dynamical simulation that actively couples the condensati
 on physics\, to the radiative transfer and hence the disc's temperature\, 
 dust dynamics and growth. I will use this simulation to show that snow-lin
 es are not static\, but dynamically evolve in otherwise stationary discs a
 nd drive the dynamics in the outer regions of protoplanetary discs. We fin
 d the CO snow-line can move 10s AU on timescales of a few 1e5 years\, crea
 ting further structures and rings in the disc and even multiple snow-lines
 . This thermal instability at snow-lines is likely important for the chemi
 cal\, thermal and dynamical evolution of protoplanetary discs. It perhaps 
 even plays a role in explaining ringed ALMA discs and planet/planetesimal 
 formation.\n\nhttps://iaus379.aip.de/event/1/contributions/31/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://iaus379.aip.de/event/1/contributions/31/
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