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SUMMARY:Just how weird is the solar system?  - Tim Elliott\, University of
  Bristol
DTSTART:20211028T140000Z
DTEND:20211028T150000Z
UID:TALK162802@talks.cam.ac.uk
CONTACT:Oscar Branson
DESCRIPTION:In addition to the perhaps unusual presence of life\, our sola
 r system has two highly peculiar characteristics in its inorganic isotopic
  signature. The first is a marked abundance of the extremely neutron rich 
 nuclide 48Ca relative to its slightly less neutron rich sibling 46Ca.  Suc
 h relative isotopic abundances require a substantial input of eluvia from 
 a rare type of super-nova\, unexpected in a stellar nursery environment. S
 econdly\, there is evidence that the solar system started life with suffic
 ient abundance of short-lived 26Al (half life ~0.75Ma) to drive early plan
 etary melting\, but this requires alarmingly short transit times of materi
 al from the stellar source of 26Al to the proto-solar disk.  Given these s
 ignificant implications of these isotopic observations\, it is critical to
  check that they are robust. Indeed\, there are plausible alternative rati
 onalisations of the data. In this talk I will recount attempts to place no
 vel constraints on the validity of these striking isotopic signatures to i
 nvestigate if we are truly odd or just mis-understood.
LOCATION:Zoom Seminar
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