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Kilonovae Across the Nuclear Physics Landscape: The Impact of Nuclear Physics Uncertainties on r-process-powered Emission

Barnes, Jennifer ; Zhu, Y. L. ; Lund, K. A. ; Sprouse, T. M. ; Vassh, N. ; McLaughlin, G. C. ; Mumpower, M. R. ; Surman, R.

The Astrophysical journal, 2021-09, Vol.918 (2), p.44 [Periódico revisado por pares]

Philadelphia: The American Astronomical Society

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Título:
Kilonovae Across the Nuclear Physics Landscape: The Impact of Nuclear Physics Uncertainties on r-process-powered Emission
Autor: Barnes, Jennifer ; Zhu, Y. L. ; Lund, K. A. ; Sprouse, T. M. ; Vassh, N. ; McLaughlin, G. C. ; Mumpower, M. R. ; Surman, R.
Assuntos: ASTRONOMY AND ASTROPHYSICS ; Astrophysics ; Coalescence ; Coalescing ; Decay ; Ejecta ; Emission ; Gravitational wave sources ; Heating ; kilonova ; Kilonovae ; Light curve ; neutron star merger ; Neutron stars ; Nuclear capture ; Nuclear physics ; NUCLEAR PHYSICS AND RADIATION PHYSICS ; Nuclei ; Outflow ; Physics ; R-process ; Radiation ; Radiation transport ; Stellar mergers ; Thermalization (energy absorption) ; Uncertainty
É parte de: The Astrophysical journal, 2021-09, Vol.918 (2), p.44
Notas: High-Energy Phenomena and Fundamental Physics
AAS28112
LA-UR-20-28560
USDOE Laboratory Directed Research and Development (LDRD) Program
89233218CNA000001
Descrição: Abstract Merging neutron stars produce “kilonovae”—electromagnetic transients powered by the decay of unstable nuclei synthesized via rapid neutron capture (the r -process) in material that is gravitationally unbound during inspiral and coalescence. Kilonova emission, if accurately interpreted, can be used to characterize the masses and compositions of merger-driven outflows, helping to resolve a long-standing debate about the origins of r -process material in the Universe. We explore how the uncertain properties of nuclei involved in the r -process complicate the inference of outflow properties from kilonova observations. Using r -process simulations, we show how nuclear physics uncertainties impact predictions of radioactive heating and element synthesis. For a set of models that span a large range in both predicted heating and final abundances, we carry out detailed numerical calculations of decay product thermalization and radiation transport in a kilonova ejecta with a fixed mass and density profile. The light curves associated with our models exhibit great diversity in their luminosities, with peak brightness varying by more than an order of magnitude. We also find variability in the shape of the kilonova light curves and their color, which in some cases runs counter to the expectation that increasing levels of lanthanide and/or actinide enrichment will be correlated with longer, dimmer, redder emission.
Editor: Philadelphia: The American Astronomical Society
Idioma: Inglês

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Kilonovae Across the Nuclear Physics Landscape: The Impact of Nuclear Physics Uncertainties on r-process-powered Emission

Barnes, Jennifer ; Zhu, Y. L. ; Lund, K. A. ; Sprouse, T. M. ; Vassh, N. ; McLaughlin, G. C. ; Mumpower, M. R. ; Surman, R.

Philadelphia: The American Astronomical Society

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