New Type Ia Supernova Yields and the Manganese and Nickel Problems in the Milky Way and Dwarf Spheroidal Galaxies
Abstract
In our quest to identify the progenitors of Type Ia supernovae (SNe Ia), we first update the nucleosynthesis yields for both near-Chandrasekhar- (Ch) and sub-Ch-mass white dwarfs (WDs) for a wide range of metallicities with our 2D hydrodynamical code and the latest nuclear reaction rates. We then include the yields in our galactic chemical evolution code to predict the evolution of elemental abundances in the solar neighborhood and dwarf spheroidal (dSph) galaxies Fornax, Sculptor, Sextans, and Carina. In the observations of the solar neighborhood stars, Mn shows an opposite trend to α elements, showing an increase toward higher metallicities, which is very well reproduced by the deflagration–detonation transition of Ch-mass WDs but never by double detonations of sub-Ch-mass WDs alone. The problem of Ch-mass SNe Ia was the Ni overproduction at high metallicities. However, we found that Ni yields of Ch-mass SNe Ia are much lower with the solar-scaled initial composition than in previous works, which keeps the predicted Ni abundance within the observational scatter. From the evolutionary trends of elemental abundances in the solar neighborhood, we conclude that the contribution of sub-Ch-mass SNe Ia to chemical enrichment is up to 25%. In dSph galaxies, however, larger enrichment from sub-Ch-mass SNe Ia than in the solar neighborhood may be required, which causes a decrease in [(Mg, Cr, Mn, Ni)/Fe] at lower metallicities. The observed high [Mn/Fe] ratios in Sculptor and Carina may also require additional enrichment from pure deflagrations, possibly as SNe Iax. Future observations of dSph stars will provide more stringent constraints on the progenitor systems and explosion mechanism of SNe Ia.
Additional Information
© 2020 The American Astronomical Society. Received 2019 May 29; revised 2020 April 24; accepted 2020 April 25; published 2020 June 4. We thank K. Shen and I. Seitenzahl for providing nucleosynthesis data and A. Ruiter for binary population synthesis data. We are grateful to E. Kirby, M. de los Reyes, K. Hayashi, and A. Bunker for fruitful discussion. C.K. acknowledges funding from the UK Science and Technology Facility Council (STFC) through grants ST/M000958/1 and ST/R000905/1. This work used the DiRAC Data Centric system at Durham University, operated by the Institute for Computational Cosmology on behalf of the STFC DiRAC HPC Facility (www.dirac.ac.uk). This equipment was funded by BIS National E-infrastructure capital grant ST/H008519/1, STFC capital grant ST/K00087X/1, DiRAC Operations grant ST/K003267/1, and Durham University. DiRAC is part of the National E-Infrastructure. Numerical computations were also carried out in part on the PC cluster at the Center for Computational Astrophysics, National Astronomical Observatory of Japan. S.C.L. acknowledges support by HST-AR-15021.001-A. This work has been supported by the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan, and JSPS KAKENHI grant Nos. JP17K05382 and JP20K04024.Attached Files
Published - Kobayashi_2020_ApJ_895_138.pdf
Accepted Version - 1906.09980.pdf
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Additional details
- Eprint ID
- 103741
- Resolver ID
- CaltechAUTHORS:20200608-100607153
- ST/M000958/1
- Science and Technology Facilities Council (STFC)
- ST/R000905/1
- Science and Technology Facilities Council (STFC)
- ST/H008519/1
- Science and Technology Facilities Council (STFC)
- ST/K00087X/1
- Science and Technology Facilities Council (STFC)
- ST/K003267/1
- Science and Technology Facilities Council (STFC)
- Durham University
- HST-AR-15021.001-A
- NASA Hubble Fellowship
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- JP17K05382
- Japan Society for the Promotion of Science (JSPS)
- JP20K04024
- Japan Society for the Promotion of Science (JSPS)
- Created
-
2020-06-08Created from EPrint's datestamp field
- Updated
-
2023-03-16Created from EPrint's last_modified field
- Caltech groups
- TAPIR, Walter Burke Institute for Theoretical Physics