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New Type Ia Supernova Yields and the Manganese and Nickel Problems in the Milky Way and Dwarf Spheroidal Galaxies

Kobayashi, Chiaki and Leung, Shing-Chi and Nomoto, Ken’ichi (2020) New Type Ia Supernova Yields and the Manganese and Nickel Problems in the Milky Way and Dwarf Spheroidal Galaxies. Astrophysical Journal, 895 (2). Art. No. 138. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20200608-100607153

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/ab8e44DOIArticle
https://arxiv.org/abs/1906.09980arXivDiscussion Paper
ORCID:
AuthorORCID
Kobayashi, Chiaki0000-0002-4343-0487
Leung, Shing-Chi0000-0002-4972-3803
Nomoto, Ken’ichi0000-0001-9553-0685
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.
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funders:
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)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
Durham UniversityUNSPECIFIED
NASA Hubble FellowshipHST-AR-15021.001-A
Ministry of Education, Culture, Sports, Science and Technology (MEXT)UNSPECIFIED
Japan Society for the Promotion of Science (JSPS)JP17K05382
Japan Society for the Promotion of Science (JSPS)JP20K04024
Subject Keywords:Type Ia supernovae ; Supernovae ; Nucleosynthesis ; Explosive nucleosynthesis ; Chemical abundances ; Galaxy chemical evolution ; Dwarf spheroidal galaxies ; Sculptor dwarf elliptical galaxy ; Fornax dwarf spheroidal galaxy
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Type Ia supernovae (1728); Supernovae (1668); Nucleosynthesis (1131); Explosive nucleosynthesis (503); Chemical abundances (224); Galaxy chemical evolution (580); Dwarf spheroidal galaxies (420)
Record Number:CaltechAUTHORS:20200608-100607153
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200608-100607153
Official Citation:Chiaki Kobayashi et al 2020 ApJ 895 138
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103741
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Jun 2020 17:13
Last Modified:08 Jun 2020 17:13

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