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SUMMARY:The Dynamic Chemistry of Planet-Forming Disks - Luke Keyte (UCL)
DTSTART:20250506T120000Z
DTEND:20250506T130000Z
UID:TALK231592@talks.cam.ac.uk
CONTACT:Dr Dolev Bashi
DESCRIPTION:The chemical composition of a planet’s atmosphere is intimat
 ely tied to the volatile inventory of the protoplanetary disk in which it 
 forms. Establishing this connection requires detailed measurements of elem
 ental abundances in disks at small spatial scales relevant to planet forma
 tion. In this talk\, I will present two targeted studies of well-known Her
 big Ae/Be systems\, combining ALMA observations with chemical modelling to
  probe disk chemistry. In HD 100546\, we detect complex molecular asymmetr
 ies\, interpreted as the result of shadowing from planet-induced structure
 s within the inner cavity\, generating azimuthal temperature variations th
 at drive chemical diversity. In HD 169142\, we investigate the first detec
 tion of SiS emission from a protoplanetary disk—nearly a billion times b
 righter than predicted under typical conditions—indicative of planet-ind
 uced shocks that release silicon from dust grains into the gas phase. Thes
 e findings reveal that planet formation can significantly reshape the chem
 ical environment of disks\, with direct implications for how emerging plan
 ets accrete their atmospheres. Together\, these studies emphasise the dyna
 mic and heterogeneous nature of disk chemistry and provide new insights in
 to the origins of the wide diversity observed in exoplanetary atmospheres.
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LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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