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CATEGORIES:Exoplanet Seminars
SUMMARY:Observational constraints on the likelihood of 26A
 l in planet-forming environments - Megan Reiter (E
 dinburgh)
DTSTART;TZID=Europe/London:20210511T130000
DTEND;TZID=Europe/London:20210511T140000
UID:TALK158788AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/158788
DESCRIPTION:Recent work suggests that 26Al may determine the w
 ater budget in terrestrial exoplanets as its radio
 active decay dehydrates planetesimals leading to d
 rier\, rockier compositions. I will review the obs
 erved distribution of 26Al in the Galaxy and typic
 al star-forming environments and how this affects 
 the likelihood of 26Al enrichment during planet fo
 rmation. These observations indicate that high-mas
 s stars dominate the production of 26Al. Most star
 s (and thus most planets) form in high-mass star-f
 orming regions where observed 26Al abundances are 
 comparable to those in the early Solar System. The
 se high abundances appear to be maintained for a f
 ew Myr\, much longer than the 0.7 Myr half-life of
  26Al. Regular replenishment of 26Al\, especially 
 when coupled with the small age differences that a
 re common in high-mass star-forming complexes\, ma
 y significantly increase the number of star/planet
  forming systems exposed to 26Al. I will argue tha
 t these observations are at odds with typical mode
 l assumptions for 26Al enrichment of the Solar Sys
 tem but an excellent starting point for more gener
 al models of 26Al enrichment in planet formation. 
 In particular\, the data suggest that the conditio
 ns for rocky planet formation are not rare\, nor a
 re they ubiquitous\, as small regions like Taurus 
 that lack high-mass stars to produce 26Al may be l
 ess likely to form rocky planets. 
LOCATION:ONLINE - Details to be sent by email
CONTACT:Dr Annelies Mortier
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