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Session 25 - Solar System.
Oral session, Monday, January 13
Piers 2/3,
Our elements came from a massive, spinning supernova (1,2) that collapsed and exploded axially about 5 billion years ago , leaving a rotationally-supported (4), equatorial disk of material that formed planets. Interstellar grains did not survive the supernova (SN), which can be dated with Pu-244 and U-238. The sun formed on the SN core. Irradiation from the condensing sun (5) continued to make other radioactivities and fusile elements (D, Li, Be and B). Light elements from the outer SN layers formed giant, Jovian planets. The Fe-rich region surrounding the SN core produced iron cores of the terrestrial planets, and these were layered with a mantle of stony meteorites that formed in an intermediate SN region. Intrasolar diffusion enriches lighter nuclei at the sun's surface.(6)
key words: supernova, nucleogenetic heterogeneities, planetary systems, intrasolar diffusion
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