A very early origin of isotopically distinct nitrogen in inner Solar System protoplanets
| Autor: | Bernard Marty, Damanveer S. Grewal, Rajdeep Dasgupta |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Solar System
010504 meteorology & atmospheric sciences FOS: Physical sciences Protoplanetary disk 01 natural sciences Astrobiology Jupiter Physics - Geophysics Planet 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Earth and Planetary Astrophysics (astro-ph.EP) Chemistry Astronomy and Astrophysics Accretion (astrophysics) Geophysics (physics.geo-ph) Meteorite 13. Climate action Physics::Space Physics Terrestrial planet Astrophysics::Earth and Planetary Astrophysics Formation and evolution of the Solar System Protoplanet Geology Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Nature Astronomy |
| DOI: | 10.48550/arxiv.2105.05323 |
| Popis: | Understanding the origin of life-essential volatiles like N in the Solar System and beyond is critical to evaluate the potential habitability of rocky planets. Whether the inner Solar System planets accreted these volatiles from their inception or had an exogenous delivery from the outer Solar System is, however, not well understood. Using previously published data of nucleosynthetic anomalies of Ni, Mo, W and Ru in iron meteorites along with their 15N-14N ratios, here we show that the earliest formed protoplanets in the inner and outer protoplanetary disk accreted isotopically distinct N. While the Sun and Jupiter captured N from nebular gas, concomitantly growing protoplanets in the inner and outer disk possibly sourced their N from organics and/or dust - with each reservoir having a different N isotopic composition. A distinct N isotopic signature of the inner Solar System protoplanets coupled with their rapid accretion suggests that non-nebular, isotopically processed N was ubiquitous in their growth zone at 0-0.3 Myr after the formation of CAIs. Because 15N-14N ratio of the bulk silicate Earth falls between that of inner and outer Solar System reservoirs, we infer that N in the present-day rocky planets represents a mixture of both inner and outer Solar System material. Comment: 29 pgaes, 4 figures, 3 extended data figures |
| Databáze: | OpenAIRE |
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