Telescopes versus Microscopes: the puzzle of Iron-60
arXiv:0808.2506 · doi:10.1051/eas/1041019
Abstract
The discovery that the short-lived radionucleide iron-60 was present in the oldest meteorites suggests that the formation of the Earth closely followed the death of a massive star. I discuss three astrophysical origins: winds from an AGB star, injection of supernova ejecta into circumstellar disks, and induced star formation on the boundaries of HII regions. I show that the first two fail to match the solar system iron-60 abundance in the vast majority of star forming systems. The cores and pillars on the edges of HII regions are spectacular but rare sites of star formation and larger clumps with masses 1e3-1e4 solar masses at tens of parsec from a supernova are a more likely birth environment for our Sun. I also examine gamma-ray observations of iron-60 decay and show that the Galactic background could account for the low end of the range of meteoritic measurements if the massive star formation rate was at least a factor of 2 higher 4.6 Gyr ago.
to appear in the proceedings of the Les Houches Winter School "Physics and Astrophysics of Planetary Systems", (EDP Sciences: EAS Publications Series)
References in corpus (15)
- Theory of Star Formation
- Radioactive 26Al and massive stars in the Galaxy
- High Resolution Submillimeter Constraints on Circumstellar Disk Structure
- Early Evolution of Stellar Groups and Clusters: Environmental Effects on Forming Planetary Systems
- Short-lived Nuclei in the Early Solar System: Possible AGB Sources
- A complete 12CO 2-1 map of M51 with HERA: I. Radial averages of CO, HI, and radio continuum
- Current Star Formation in the Perseus Molecular Cloud: Constraints from Unbiased Submillimeter and Mid-Infrared Surveys
- Dynamical HII Region Evolution in Turbulent Molecular Clouds
- Interaction of Supernova Ejecta with Nearby Protoplanetary Disks
- SPITZER/IRAC-MIPS Survey of NGC2244: Protostellar Disk Survival in the Vicinity of Hot Stars
- The origin of short-lived radionuclides and the astrophysical environment of solar system formation
- Radioactive Probes of the Supernova-Contaminated Solar Nebula: Evidence that the Sun was Born in a Cluster
- A FLAMINGOS Deep Near Infrared Imaging Survey of the Rosette Complex I: Identification and Distribution of the Embedded Population
- On the likelihood of supernova enrichment of protoplanetary disks
- Dynamical Expansion of H II Regions from Ultracompact to Compact Sizes in Turbulent, Self-Gravitating Molecular Clouds