Volume 582, October 2015
|Number of page(s)||7|
|Section||Interstellar and circumstellar matter|
|Published online||30 September 2015|
The abundance of 26Al-rich planetary systems in the Galaxy
1 IMPMC, Muséum National d’Histoire Naturelle, Sorbonne Universités, CNRS, UPMC & IRD, 57 rue Cuvier, 75005 Paris, France
2 Institut Universitaire de France, 103 boulevard Saint-Michel, 75005 Paris, France
Received: 24 March 2015
Accepted: 17 June 2015
One of the most puzzling properties of the solar system is the high abundance at its birth of 26Al, a short-lived radionuclide with a mean life of 1 Myr. Now decayed, it has left its imprint in primitive meteoritic solids. The origin of 26Al in the early solar system has been debated for decades and strongly constrains the astrophysical context of the Sun and planets formation. We show that, according to the present understanding of star-formation mechanisms, it is very unlikely that a nearby supernova has delivered 26Al into the nascent solar system. A more promising model is the one whereby the Sun formed in a wind-enriched, 26Al-rich dense shell surrounding a massive star (M > 32 M⊙). We calculate that the probability of any given star in the Galaxy being born in such a setting, corresponding to a well-known mode of star formation, is of the order of 1%. It means that our solar system, though not the rule, is relatively common and that many exo-planetary systems in the Galaxy might exhibit comparable enrichments in 26Al. Such enrichments played an important role in the early evolution of planets because 26Al is the main heat source for planetary embryos.
Key words: meteorites, meteors, meteoroids / stars: formation / stars: protostars / planetary systems
© ESO, 2015
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.