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SUMMARY:Polluted White Dwarfs: the dead stars that swallow dead planets - 
 Laura Rogers
DTSTART:20191203T193000Z
DTEND:20191203T210000Z
UID:TALK131980@talks.cam.ac.uk
CONTACT:Oliver Normand
DESCRIPTION:We have now discovered over 4000 exoplanets\, but how can we d
 etermine their interior composition? Observations of polluted white dwarfs
  are unique laboratories for answers. White dwarfs are the leftover cores 
 of low to medium mass stars which have ended their life on the main sequen
 ce. As white dwarfs are so dense\, heavy elements should not be observable
  in their atmospheres as they sink towards the core. However\, ~30% of whi
 te dwarfs are observed with heavy elements in their atmosphere\, these fea
 tures have been identified as planetary material. Planetary material which
  approaches the white dwarf is torn apart\, and subsequently falls onto th
 e atmosphere of the white dwarf. From observations of white dwarfs’ atmo
 spheres we can discover the composition of the planetary material. This ta
 lk will bring together different observations of polluted white dwarfs to 
 try to build up a picture of these enigmatic systems.\n\nThe talk will be 
 followed by refreshments outside the lecture theatre. \n\nThe talk will be
  at the usual location of Wolfson lecture theatre in the Department of Che
 mistry. The entrance is the opposite side of the building to Bristol-Myers
 -Squibb Lecture theatre and is opposite the car park- shown by the red arr
 ow on the map. https://map.cam.ac.uk/Department+of+Chemistry#52.197964\,0.
 125242\,18\n\nTickets are £2 or free for members. Annual membership (£7)
  and life membership (£12) can also be purchased at the event – please 
 bring cash. The talk will be followed by refreshments outside the lecture 
 theatre.\n
LOCATION:Wolfson Lecture Theatre\, Department of Chemistry
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