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SUMMARY:Pandemonium in the Planetary Graveyard - Jay Farihi (UCL)
DTSTART:20220118T130000Z
DTEND:20220118T140000Z
UID:TALK168071@talks.cam.ac.uk
CONTACT:Dr Annelies Mortier
DESCRIPTION:Defying the notion of the silent graveyard\, planetary systems
  refuse to die quietly. Instead\, a significant fraction show one or more 
 signs of dynamical reanimation\, with strong indications of general mayhem
  during the last stages of stellar evolution. I will give a brief tour of 
 these evolved and active planetary systems\, which provide major insights 
 into rocky planetary bodies in particular. These descendants of intermedia
 te mass stars reveal characteristics of their former planetary systems in 
 ways unattainable by conventional methods using main sequence stars. In pa
 rticular\, the metal pollution observed in white dwarf stars reveals the b
 ulk chemistry of entire planetesimals or planetary fragments\, including c
 ompelling evidence for Earth-like chemistry\, planetary differentiation\, 
 and believe it or not\, water. This talk will cover some of the highlights
  of the active planetary graveyard\, including variability and transient b
 ehavior.
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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