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SUMMARY:Observational constraints on the likelihood of 26Al in planet-form
 ing environments - Megan Reiter (Edinburgh)
DTSTART:20210511T120000Z
DTEND:20210511T130000Z
UID:TALK158788@talks.cam.ac.uk
CONTACT:Dr Annelies Mortier
DESCRIPTION:Recent work suggests that 26Al may determine the water budget 
 in terrestrial exoplanets as its radioactive decay dehydrates planetesimal
 s leading to drier\, rockier compositions. I will review the observed dist
 ribution of 26Al in the Galaxy and typical star-forming environments and h
 ow this affects the likelihood of 26Al enrichment during planet formation.
  These observations indicate that high-mass stars dominate the production 
 of 26Al. Most stars (and thus most planets) form in high-mass star-forming
  regions where observed 26Al abundances are comparable to those in the ear
 ly Solar System. These high abundances appear to be maintained for a few M
 yr\, much longer than the 0.7 Myr half-life of 26Al. Regular replenishment
  of 26Al\, especially when coupled with the small age differences that are
  common in high-mass star-forming complexes\, may significantly increase t
 he number of star/planet forming systems exposed to 26Al. I will argue tha
 t these observations are at odds with typical model assumptions for 26Al e
 nrichment of the Solar System but an excellent starting point for more gen
 eral models of 26Al enrichment in planet formation. In particular\, the da
 ta suggest that the conditions for rocky planet formation are not rare\, n
 or are they ubiquitous\, as small regions like Taurus that lack high-mass 
 stars to produce 26Al may be less likely to form rocky planets. 
LOCATION:ONLINE - Details to be sent by email
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