Thermonuclear explosions of rapidly differentially rotating white dwarfs: Candidates for superluminous Type Ia supernovae?

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    Thermonuclear explosions of rapidly differentially rotating white dwarfs: Candidates for superluminous Type Ia supernovae? / Fink, M.; Kromer, M.; Hillebrandt, W.; Röpke, F. K.; Pakmor, R.; Seitenzahl, I. R.; Sim, S. A.

    In: Astronomy & Astrophysics, Vol. 618, 22.10.2018.

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    Fink, M. ; Kromer, M. ; Hillebrandt, W. ; Röpke, F. K. ; Pakmor, R. ; Seitenzahl, I. R. ; Sim, S. A. / Thermonuclear explosions of rapidly differentially rotating white dwarfs: Candidates for superluminous Type Ia supernovae?. In: Astronomy & Astrophysics. 2018 ; Vol. 618.

    Bibtex

    @article{cadeae392f0c4d88a8e595601ac1d01d,
    title = "Thermonuclear explosions of rapidly differentially rotating white dwarfs: Candidates for superluminous Type Ia supernovae?",
    abstract = "The observed sub-class of {"}superluminous{"} Type Ia supernovae lacks a convincing theoretical explanation. If the emission of such objects were powered exclusively by radioactive decay of 56Ni formed in the explosion, a progenitor mass close to or even above the Chandrasekhar limit for a non-rotating white dwarf star would be required. Masses significantly exceeding this limit can be supported by differential rotation. We, therefore, explore explosions and predict observables for various scenarios resulting from differentially rotating carbon-oxygen white dwarfs close to their respective limit of stability. Specifically, we have investigated a prompt detonation model, detonations following an initial deflagration phase ({"}delayed detonation{"} models), and a pure deflagration model. In postprocessing steps, we performed nucleosynthesis and three-dimensional radiative transfer calculations, that allow us, for the first time, to consistently derive synthetic observables from our models. We find that all explosion scenarios involving detonations produce very bright events. The observables predicted for them, however, are inconsistent with any known subclass of Type Ia supernovae. Pure deflagrations resemble 2002cx-like supernovae and may contribute to this class. We discuss implications of our findings for the explosion mechanism and for the existence of differentially rotating white dwarfs as supernova progenitors. Simulation data for all models presented in this paper are available from the Heidelberg Supernova Model Archive (HESMA) at http://https://hesma.h-its.org.",
    keywords = "supernovae: general, nuclear reactions, nucleosynthesis, abundances, hydrodynamics, radiative transfer, white dwarfs",
    author = "M. Fink and M. Kromer and W. Hillebrandt and R{\"o}pke, {F. K.} and R. Pakmor and Seitenzahl, {I. R.} and Sim, {S. A.}",
    year = "2018",
    month = "10",
    day = "22",
    doi = "10.1051/0004-6361/201833475",
    language = "English",
    volume = "618",
    journal = "Astronomy and Astrophysics",
    issn = "0004-6361",
    publisher = "EDP Sciences",

    }

    RIS

    TY - JOUR

    T1 - Thermonuclear explosions of rapidly differentially rotating white dwarfs: Candidates for superluminous Type Ia supernovae?

    AU - Fink, M.

    AU - Kromer, M.

    AU - Hillebrandt, W.

    AU - Röpke, F. K.

    AU - Pakmor, R.

    AU - Seitenzahl, I. R.

    AU - Sim, S. A.

    PY - 2018/10/22

    Y1 - 2018/10/22

    N2 - The observed sub-class of "superluminous" Type Ia supernovae lacks a convincing theoretical explanation. If the emission of such objects were powered exclusively by radioactive decay of 56Ni formed in the explosion, a progenitor mass close to or even above the Chandrasekhar limit for a non-rotating white dwarf star would be required. Masses significantly exceeding this limit can be supported by differential rotation. We, therefore, explore explosions and predict observables for various scenarios resulting from differentially rotating carbon-oxygen white dwarfs close to their respective limit of stability. Specifically, we have investigated a prompt detonation model, detonations following an initial deflagration phase ("delayed detonation" models), and a pure deflagration model. In postprocessing steps, we performed nucleosynthesis and three-dimensional radiative transfer calculations, that allow us, for the first time, to consistently derive synthetic observables from our models. We find that all explosion scenarios involving detonations produce very bright events. The observables predicted for them, however, are inconsistent with any known subclass of Type Ia supernovae. Pure deflagrations resemble 2002cx-like supernovae and may contribute to this class. We discuss implications of our findings for the explosion mechanism and for the existence of differentially rotating white dwarfs as supernova progenitors. Simulation data for all models presented in this paper are available from the Heidelberg Supernova Model Archive (HESMA) at http://https://hesma.h-its.org.

    AB - The observed sub-class of "superluminous" Type Ia supernovae lacks a convincing theoretical explanation. If the emission of such objects were powered exclusively by radioactive decay of 56Ni formed in the explosion, a progenitor mass close to or even above the Chandrasekhar limit for a non-rotating white dwarf star would be required. Masses significantly exceeding this limit can be supported by differential rotation. We, therefore, explore explosions and predict observables for various scenarios resulting from differentially rotating carbon-oxygen white dwarfs close to their respective limit of stability. Specifically, we have investigated a prompt detonation model, detonations following an initial deflagration phase ("delayed detonation" models), and a pure deflagration model. In postprocessing steps, we performed nucleosynthesis and three-dimensional radiative transfer calculations, that allow us, for the first time, to consistently derive synthetic observables from our models. We find that all explosion scenarios involving detonations produce very bright events. The observables predicted for them, however, are inconsistent with any known subclass of Type Ia supernovae. Pure deflagrations resemble 2002cx-like supernovae and may contribute to this class. We discuss implications of our findings for the explosion mechanism and for the existence of differentially rotating white dwarfs as supernova progenitors. Simulation data for all models presented in this paper are available from the Heidelberg Supernova Model Archive (HESMA) at http://https://hesma.h-its.org.

    KW - supernovae: general

    KW - nuclear reactions

    KW - nucleosynthesis

    KW - abundances

    KW - hydrodynamics

    KW - radiative transfer

    KW - white dwarfs

    U2 - 10.1051/0004-6361/201833475

    DO - 10.1051/0004-6361/201833475

    M3 - Article

    VL - 618

    JO - Astronomy and Astrophysics

    T2 - Astronomy and Astrophysics

    JF - Astronomy and Astrophysics

    SN - 0004-6361

    ER -

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