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Title: ASTROPHYSICAL SHRAPNEL: DISCRIMINATING AMONG NEAR-EARTH STELLAR EXPLOSION SOURCES OF LIVE RADIOACTIVE ISOTOPES

We consider the production and deposition on Earth of isotopes with half-lives in the range 10{sup 5}-10{sup 8} yr that might provide signatures of nearby stellar explosions, extending previous analyses of Core-Collapse Supernovae (CCSNe) to include Electron-Capture Supernovae (ECSNe), Super-Asymptotic Giant Branch (SAGB) stars, Thermonuclear/Type Ia Supernovae (TNSNe), and Kilonovae/Neutron Star Mergers (KNe). We revisit previous estimates of the {sup 60}Fe and {sup 26}Al signatures, and extend these estimates to include {sup 244}Pu and {sup 53}Mn. We discuss interpretations of the {sup 60}Fe signals in terrestrial and lunar reservoirs in terms of a nearby stellar ejection ∼2.2 Myr ago, showing that (1) the {sup 60}Fe yield rules out the TNSN and KN interpretations, (2) the {sup 60}Fe signals highly constrain SAGB interpretations but do not completely them rule out, (3) are consistent with a CCSN origin, and (4) are highly compatible with an ECSN interpretation. Future measurements could resolve the radioisotope deposition over time, and we use the Sedov blast wave solution to illustrate possible time-resolved profiles. Measuring such profiles would independently probe the blast properties including distance, and would provide additional constraints for the nature of the explosion.
Authors:
;  [1] ;  [2]
  1. Department of Astronomy, University of Illinois, Urbana, IL 61801 (United States)
  2. Theoretical Physics and Cosmology Group, Department of Physics, King's College London, London WC2R 2LS (United Kingdom)
Publication Date:
OSTI Identifier:
22364195
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 800; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALUMINIUM 26; ASTROPHYSICS; ASYMPTOTIC SOLUTIONS; DEPOSITION; ELECTRON CAPTURE; ELEMENT ABUNDANCE; GIANT STARS; GRAVITATIONAL COLLAPSE; HALF-LIFE; IRON 60; MANGANESE 53; NEUTRON STARS; NUCLEOSYNTHESIS; PLUTONIUM 244; PROBES; SUPERNOVA REMNANTS; SUPERNOVAE; TIME RESOLUTION