Properties of Kilonovae from Dynamical and Post-merger Ejecta of Neutron Star Mergers
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Ejected material from neutron star mergers gives rise to electromagnetic emission powered by radioactive decays of r-process nuclei, the so-called kilonova or macronova. While properties of the emission are largely affected by opacities in the ejected material, available atomic data for r-process elements are still limited. We perform atomic structure calculations for r-process elements: Se (Z = 34), Ru (Z = 44), Te (Z = 52), Ba (Z = 56), Nd (Z = 60), and Er (Z = 68). We confirm that the opacities from bound–bound transitions of open f-shell, lanthanide elements (Nd and Er) are higher than those of the other elements over a wide wavelength range. The opacities of open s-shell (Ba), p-shell (Se and Te), and d-shell (Ru) elements are lower than those of open f-shell elements, and their transitions are concentrated in the ultraviolet and optical wavelengths. We show that the optical brightness can be different by $\gt 2$ mag depending on the element abundances in the ejecta such that post-merger, lanthanide-free ejecta produce brighter and bluer optical emission. Such blue emission from post-merger ejecta can be observed from the polar directions if the mass of the preceding dynamical ejecta in these regions is small. For the ejecta mass of 0.01 ${M}_{\odot }$, observed magnitudes of the blue emission will reach 21.0 mag (100 Mpc) and 22.5 mag (200 Mpc) in the g and r bands within a few days after the merger, which are detectable with 1 m or 2 m class telescopes.
収録刊行物
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- The Astrophysical Journal
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The Astrophysical Journal 852 (2), 109-, 2018-01-12
American Astronomical Society
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詳細情報 詳細情報について
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- CRID
- 1050009062401437440
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- NII論文ID
- 120007180031
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- NII書誌ID
- AA00553242
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- ISSN
- 0004637X
- 15384357
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- HANDLE
- 10655/00012826
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- Web Site
- https://nifs-repository.repo.nii.ac.jp/records/10857
- http://stacks.iop.org/0004-637X/852/i=2/a=109/pdf
- http://stacks.iop.org/0004-637X/852/i=2/a=109?key=crossref.916e30edd805511ccda437d843040ce4
- https://iopscience.iop.org/article/10.3847/1538-4357/aaa0cb
- https://iopscience.iop.org/article/10.3847/1538-4357/aaa0cb/pdf
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- 本文言語コード
- en
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- 資料種別
- journal article
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- IRDB
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