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SUMMARY:Planetary debris at white dwarfs - Andrew Swan (Warwick)
DTSTART:20240130T130000Z
DTEND:20240130T140000Z
UID:TALK210820@talks.cam.ac.uk
CONTACT:Dr Emily Sandford
DESCRIPTION:White dwarfs often accrete material from their remnant planeta
 ry systems\, polluting their pristine hydrogen or helium atmospheres with 
 metals. I will talk about how we can use this phenomenon to study exoplane
 tary compositions: photospheric metal lines can reveal the bulk compositio
 ns of the building blocks of rocky planets\, while infrared emission gives
  us our only glimpse of the circumstellar debris before it arrives at the 
 stellar surface. Results from dozens of systems tell us that accretion of 
 chondritic material is common\, though not universal\, while the debris di
 sks feeding accretion are dynamically active environments. The advent of J
 WST is opening new windows onto those disks\, while large spectroscopic su
 rveys are delivering an order-of-magnitude increase in the number of syste
 ms to study\, and I will present ongoing work on both fronts.
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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