Evidence for Sub-Chandrasekhar Mass Type Ia Supernovae from an Extensive Survey of Radiative Transfer Models

Goldstein, Daniel A.; Kasen, Daniel

doi:10.3847/2041-8213/aaa409

Title: Evidence for Sub-Chandrasekhar Mass Type Ia Supernovae from an Extensive Survey of Radiative Transfer Models

Journal Article · Fri Jan 12 00:00:00 EST 2018 · The Astrophysical Journal. Letters (Online)

DOI:https://doi.org/10.3847/2041-8213/aaa409· OSTI ID:1524170

^[1]; Kasen, Daniel ^[1]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

There exists two classes of viable progenitors for normal Type Ia supernovae (SNe Ia): systems in which a white dwarf explodes at the Chandrasekhar mass ($${M}_{\mathrm{ch}}$$), and systems in which a white dwarf explodes below the Chandrasekhar mass (sub-$${M}_{\mathrm{ch}}$$). It is not clear which of these channels is dominant; observations and light-curve modeling have provided evidence for both. In this work we use an extensive grid of 4500 time-dependent, multiwavelength radiation transport simulations to show that the sub-$${M}_{\mathrm{ch}}$$ model can reproduce the entirety of the width–luminosity relation, while the $${M}_{\mathrm{ch}}$$ model can only produce the brighter events $$(0.8\lt {\rm{\Delta }}{M}_{15}(B)\lt 1.55)$$, implying that fast-declining SNe Ia come from sub-$${M}_{\mathrm{ch}}$$ explosions. We do not assume a particular theoretical paradigm for the progenitor or explosion mechanism, but instead construct parameterized models that vary the mass, kinetic energy, and compositional structure of the ejecta, thereby realizing a broad range of possible outcomes of white dwarf explosions. We provide fitting functions based on our large grid of detailed simulations that map observable properties of SNe Ia, such as peak brightness and light-curve width, to physical parameters such as $${}^{56}\mathrm{Ni}$$ and total ejected mass. These can be used to estimate the physical properties of observed SNe Ia.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-05CH11231; SC0017616; SC0018297

OSTI ID:: 1524170

Journal Information:: The Astrophysical Journal. Letters (Online), Vol. 852, Issue 2; ISSN 2041-8213

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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