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SUMMARY:Constraining the composition of exo-planetary material around whit
 e dwarf stars - Amy Steele (MSI Postdoctoral Fellow\, McGill Space Institu
 te)
DTSTART:20211109T130000Z
DTEND:20211109T140000Z
UID:TALK163087@talks.cam.ac.uk
CONTACT:Paul B. Rimmer
DESCRIPTION:There is evidence that main sequence (MS)\, giant\, and white 
 dwarf (WD) stars have circumstellar (C-S) material that originates from th
 e small-body populations of their planetary systems. How (if at all) are t
 he planetesimals around MS and WD stars related? One way to address this q
 uestion is to begin at the end of the stellar life cycle for sun-like star
 s\, with the approx 30% of WDs that have unexpected heavy elements in thei
 r photospheres. This pollution likely arises from the accretion of planete
 simals that were perturbed by outer planet(s) to the WD's tidal radius. Th
 ese planetesimals sublimate\, turning into C-S gas\, and accrete onto the 
 WD surface. In this talk\, I describe a method to determine the abundances
  of elements producing C-S gas features in the spectra of the approx 30 kn
 own polluted WDs with emission features and highlight my current efforts t
 o build a database of models for these types of systems. This work will pr
 ovide a key to quickly understand the instantaneous composition of the mat
 erial flowing from these (exo) planetesimals and will eventually make this
  type of modeling more accessible in the future.
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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