TY  - JOUR
A1  - Bekaert, David V.
A1  - Auro, Maureen
A1  - Shollenberger, Quinn R.
A1  - Liu, Ming-Chang
A1  - Marschall, Horst
A1  - Burton, Kevin W.
A1  - Jacobsen, Benjamin
A1  - Brennecka, Gregory A.
A1  - MacPherson, Glenn J.
A1  - Mutius, Richard von
A1  - Sarafian, Adam
A1  - Nielsen, Sune G.
T1  - Fossil records of early solar irradiation and cosmolocation of the CAI factory: a reappraisal
T2  - Science Advances
N2  - Calcium-aluminum–rich inclusions (CAIs) in meteorites carry crucial information about the environmental conditions of the nascent Solar System prior to planet formation. Based on models of 50V–10Be co-production by in-situ irradiation, CAIs are considered to have formed within ~0.1 AU from the proto-Sun. Here, we present vanadium (V) and strontium (Sr) isotopic co-variations in fine- and coarse-grained CAIs and demonstrate that kinetic isotope effects during partial condensation and evaporation best explain V isotope anomalies previously attributed to solar particle irradiation. We also report initial excesses of 10Be and argue that CV CAIs possess essentially a homogeneous level of 10Be, inherited during their formation. Based on numerical modeling of 50V–10Be co-production by irradiation, we show that CAI formation during protoplanetary disk build-up likely occurred at greater heliocentric distances than previously considered, up to planet-forming regions (~1AU), where solar particle fluxes were sufficiently low to avoid substantial in-situ irradiation of CAIs.
Y1  - 2021
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/75743
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-757431
SN  - 2375-2548
VL  - 7
IS  - 40, art. eabg8329
PB  - American Association for the Advancement of Science
CY  - Washington, DC [u.a.]
ER  -