Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 775, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/775/2/L41
Keywords
planetary systems; white dwarfs
Categories
Funding
- NSF
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1207861] Funding Source: National Science Foundation
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Recently acquired evidence shows that extrasolar asteroids exhibit over a factor of 100 variation in the iron to aluminum abundance ratio. This large range likely is a consequence of igneous differentiation that resulted from heating produced by radioactive decay of Al-26 with an abundance comparable to that in the solar system's protoplanetary disk at birth. If so, the conventional view that our solar system began with an unusually high amount of Al-26 should be discarded.
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