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Title: A New Model for Electron-capture Supernovae in Galactic Chemical Evolution

Journal Article · · The Astrophysical Journal (Online)
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Hungarian Academy of Sciences, Budapest (Hungary); Michigan State Univ., East Lansing, MI (United States); Joint Institute for Nuclear Astrophysics—Center for the Evolution of the Elements, East Lansing, MI (United States)
  3. Zentrum für Astronomie der Univ. Heidelberg, Heidelberg (Germany); Heidelberg Inst. for Theoretical Studies, Heidelberg (Germany)
  4. Max Planck Inst. for Gravitational Physics (Albert Einstein Institute), Potsdam-Golm (Germany); Sophia Univ., Tokyo (Japan); RIKEN, Saitama (Japan)
+ Show Author Affiliations

We examine the contribution of electron-capture supernovae (ECSNe), low-mass SNe from collapsing Fe cores (FeCCSNe), and rotating massive stars to the chemical composition of the Galaxy. Our model includes contributions to chemical evolution from both thermonuclear ECSNe (tECSNe) and gravitational collapse ECSNe (cECSNe). We show that if ECSNe are predominantly gravitational collapse SNe but about 15% are partial thermonuclear explosions, the model is able to reproduce the solar abundances of several important and problematic isotopes including $${}^{48}\mathrm{Ca}$$, $${}^{50}\mathrm{Ti}$$, and 54Cr together with 58Fe, 64Ni, 82Se, and 86Kr and several of the Zn–Zr isotopes. A model in which no cECSNe occur, only tECSNe with low-mass FeCCSNe or rotating massive stars, proves also very successful at reproducing the solar abundances for these isotopes. Despite the small mass range for the progenitors of ECSNe and low-mass FeCCSNe, the large production factors suffice for the solar inventory of the above isotopes. Our model is compelling because it introduces no new tensions with the solar abundance distribution for a Milky Way model—only tending to improve the model predictions for several isotopes. Here, the proposed astrophysical production model thus provides a natural and elegant way to explain one of the last uncharted territories on the periodic table of astrophysical element production.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
LDRD; USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1570629
Report Number(s):
LA-UR--19-25987
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 882; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

The Pristine survey – IX. CFHT ESPaDOnS spectroscopic analysis of 115 bright metal-poor candidate stars journal December 2019
Enrichment of Strontium in Dwarf Galaxies journal October 2019

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79 ASTRONOMY AND ASTROPHYSICS
Galaxy: abundances
Sun: abundances
abundances
nuclear reactions
nucleosynthesis
stars: evolution
supernovae: general