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Production of all the r-process nuclides in the dynamical ejecta of neutron star mergers
- S. Wanajo, Yuichiro Sekiguchi, N. Nishimura, K. Kiuchi, K. Kyutoku, M. Shibata
- Physics
- 28 February 2014
Recent studies suggest that binary neutron star (NS-NS) mergers robustly produce heavy r-process nuclei above the atomic mass number A ~ 130 because their ejecta consist of almost pure neutrons…
PROGENITOR MODELS OF THE ELECTROMAGNETIC TRANSIENT ASSOCIATED WITH THE SHORT GAMMA RAY BURST 130603B
- K. Hotokezaka, K. Kyutoku, S. Wanajo
- Physics
- 6 October 2013
An electromagnetic transient powered by the radioactive decay of r-process elements, a so-called kilonova/macronova, is one of the possible observable consequences of compact binary mergers including…
Neutron-Capture Elements in the Very Metal Poor Star HD 122563*
- S. Honda, W. Aoki, Y. Ishimaru, S. Wanajo, S. Ryan
- Physics
- 6 February 2006
We obtained high-resolution, high signal-to-noise ratio (S/N) spectroscopy for the very metal poor star HD 122563 with the Subaru Telescope High Dispersion Spectrograph. Previous studies have shown…
Neutron-Capture Elements in the Very Metal-poor Star HD 88609: Another Star with Excesses of Light Neutron-Capture Elements
- S. Honda, W. Aoki, Y. Ishimaru, S. Wanajo
- Physics
- 27 May 2007
We obtained a high-resolution, high-signal-to-noise UV-blue spectrum of the extremely metal-poor red giant HD 88609 to determine the abundances of heavy elements. Nineteen neutron-capture elements…
Radioactive decay products in neutron star merger ejecta: heating efficiency and γ-ray emission
- K. Hotokezaka, S. Wanajo, Masaomi Tanaka, A. Bamba, Y. Terada, T. Piran
- Physics
- 17 November 2015
The radioactive decay of the freshly synthesized r-process nuclei ejected in compact binary mergers powers optical/infrared macronovae (kilonovae) that follow these events. The light curves depend…
ELECTRON-CAPTURE SUPERNOVAE AS THE ORIGIN OF ELEMENTS BEYOND IRON
- S. Wanajo, H. Janka, B. Mueller
- Physics
- 6 September 2010
We examine electron-capture supernovae (ECSNe) as sources of elements heavier than iron in the solar system and in Galactic halo stars. Nucleosynthesis calculations are performed on the basis of…
THE r-PROCESS IN PROTO-NEUTRON-STAR WIND REVISITED
- S. Wanajo
- Physics
- 2 May 2013
We examine the r-process in the neutrino-driven proto-neutron-star (PNS) wind of core-collapse supernovae in light of the recent findings of massive neutron stars in binaries as well as of an…
Properties of Kilonovae from Dynamical and Post-merger Ejecta of Neutron Star Mergers
- Masaomi Tanaka, D. Kato, H. Sakaue
- Physics
- 30 August 2017
Ejected material from neutron star mergers give rise to electromagnetic emission powered by radioactive decays of r-process nuclei, which is so called kilonova or macronova. While properties of the…
The r-Process in the Neutrino Winds of Core-Collapse Supernovae and U-Th Cosmochronology
- S. Wanajo, N. Itoh, Y. Ishimaru, S. Nozawa, T. Beers
- Physics
- 10 June 2002
The discovery of the second highly r-process-enhanced, extremely metal poor star, CS 31082-001 ([Fe/H] = -2.9) has provided a powerful new tool for age determination by virtue of the detection and…
Silver and palladium help unveil the nature of a second r-process
- C. Hansen, F. Primas, H. Nilsson
- Physics
- 21 May 2012
Context. The rapid neutron-capture process, which created about half of the heaviest elements in the solar system, is believed to have been unique. Many recent studies have shown that this uniqueness…
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