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Explosive Nucleosynthesis in Sub-Chandrasekhar-mass White Dwarf Models for Type Ia Supernovae: Dependence on Model Parameters

Leung, Shing-Chi and Nomoto, Ken’ichi (2020) Explosive Nucleosynthesis in Sub-Chandrasekhar-mass White Dwarf Models for Type Ia Supernovae: Dependence on Model Parameters. Astrophysical Journal, 888 (2). Art. No. 80. ISSN 1538-4357. doi:10.3847/1538-4357/ab5c1f.

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Recent observations of Type Ia supernovae (SNe Ia) have shown diversified properties of the explosion strength, light curves, and chemical composition. To investigate possible origins of such diversities in SNe Ia, we have presented multidimensional hydrodynamical studies of explosions and associated nucleosynthesis in near-Chandrasekhar-mass carbon–oxygen (CO) white dwarfs (WDs) for a wide range of parameters. In the present paper, we extend our wide parameter survey of models to the explosions of sub-Chandrasekhar-mass CO WDs. We take the double-detonation model for the explosion mechanism. The model parameters of the survey include a metallicity of Z = 0–5 Z⊙, a CO WD mass of M = 0.90–1.20 M⊙, and a He envelope mass of M_(He) = 0.05–0.20 M⊙. We also study how the initial He detonation configuration, such as spherical, bubble, and ring shapes, triggers the C detonation. For these parameters, we derive the minimum He envelope mass necessary to trigger the C detonation. We then examine how the explosion dynamics and associated nucleosynthesis depend on these parameters, and we compare our results with the previous representative models. We compare our nucleosynthesis yields with the unusual abundance patterns of Fe-peak elements and isotopes observed in SNe Ia SN 2011fe, SN 2012cg, and SN 2014J, as well as SN Ia remnant 3C 397, to provide constraints on their progenitors and environments. We provide the nucleosynthesis yields table of the sub-Chandrasekhar-mass explosions, to discuss their roles in the galactic chemical evolution and archaeology.

Item Type:Article
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URLURL TypeDescription Paper
Leung, Shing-Chi0000-0002-4972-3803
Nomoto, Ken’ichi0000-0001-9553-0685
Additional Information:© 2020 The American Astronomical Society. Received 2019 January 15; revised 2019 November 24; accepted 2019 November 25; published 2020 January 10. This work has been supported by the World Premier International Research Center Initiative (WPI) and JSPS KAKENHI grant No. JP17K05382. S.C.L. acknowledges support from grant HST-AR-15021.001-A. We thank the anonymous referee for the very detailed and helpful suggestions to improve the manuscript. We thank Frank Timmes for his open-source microphysics subroutines, including the Helmholtz equation of state and the torch subroutine for the post-process nucleosynthesis. We also thank Ken Shen for the ideas in the numerical modeling of the detonation physics. We thank Amanda Karakas and Chiaki Kobayashi for the information about the galactic stellar abundances. Finally, we thank Roland Diehl and Jordi Isern for the inspiring discussion about SN 2014J.
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Ministry of Education, Culture, Sports, Science and Technology (MEXT)UNSPECIFIED
Japan Society for the Promotion of Science (JSPS)JP17K05382
NASA Hubble FellowshipHST-AR-15021.001-A
Subject Keywords:Type Ia supernovae; Hydrodynamical simulations; Explosive nucleosynthesis; Chemical abundances
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Type Ia supernovae (1728); Hydrodynamical simulations (767); Explosive nucleosynthesis (503); Chemical abundances (224)
Record Number:CaltechAUTHORS:20200110-144640844
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Official Citation:Shing-Chi Leung and Ken'ichi Nomoto 2020 ApJ 888 80
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100638
Deposited By: Tony Diaz
Deposited On:11 Jan 2020 00:34
Last Modified:16 Nov 2021 17:55

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