122 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Kyushu UniversityJP12 papers
- The University of TokyoJP8 papers
- Kyoto UniversityJP6 papers
- National Astronomical Observatory of JapanJP6 papers
- Saitama UniversityJP5 papers
- Waseda UniversityJP5 papers
- Kumamoto UniversityJP4 papers
- Center for Astrophysics Harvard & SmithsonianUS3 papers
- Institute of Space and Astronautical ScienceJP3 papers
- Japan Aerospace Exploration AgencyJP3 papers
- Kanto Gakuin UniversityJP3 papers
- Meiji UniversityJP3 papers
25 papers
Chlorine and Potassium Enrichment in the Cassiopeia A Supernova Remnant
XRISM collaboration
The elements in the universe are synthesized primarily in stars and supernovae, where nuclear fusion favors the production of even-Z elements. In contrast, odd-Z elements are less…
Mapping Cassiopeia A's silicon/sulfur Doppler velocities with XRISM-Resolve
Jacco Vink, Manan Agarwal, Aya Bamba +22
Young supernova remnants (SNRs) provide crucial insights into explosive nucleosynthesis products and their velocity distribution soon after the explosion. However, these velocities…
Measuring the asymmetric expansion of the Fe ejecta of Cassiopeia A with XRISM/Resolve
Aya Bamba, Manan Agarwal, Jacco Vink +24
The expansion structure of supernova remnants (SNRs) is important for understanding not only how heavy elements are distributed into space, but also how supernovae explode. The eje…
Explosive nucleosynthesis with fast neutrino-flavor conversion in core-collapse supernovae
Shin-ichiro Fujimoto, Hiroki Nagakura
Fast neutrino-flavor conversion (FFC) is a possible game-changing ingredient in core-collapse supernova (CCSN) theory. In this paper, we examine the impact of FFC on explosive nucl…
Gamma-ray Diagnostics of r-process Nucleosynthesis in the Remnants of Galactic Binary Neutron-Star Mergers
Yukikatsu Terada, Yuya Miwa, Hayato Ohsumi +4
We perform a full nuclear-network numerical calculation of the -process nuclei in binary neutron-star mergers (NSMs), with the aim of estimating -ray emissions from the remna…
Possible Detection of X-Ray Emitting Circumstellar Material in the Synchrotron-Dominated Supernova Remnant RX J 1713.7-3946
Dai Tateishi, Satoru Katsuda, Yukikatsu Terada +4
We report on a discovery of an X-ray emitting circumstellar material knot inside the synchrotron dominant supernova remnant (SNR) RX J1713.7-3946. This knot was previously thought…
The impact of asymmetric neutrino emissions on nucleosynthesis in core-collapse supernovae II -- progenitor dependences --
Shin-ichiro Fujimoto, Hiroki Nagakura
We investigate the impact of asymmetric neutrino-emissions on explosive nucleosynthesis in core-collapse supernovae (CCSNe) of progenitors with a mass range of 9.5 to 25…
The impact of isomers on a kilonova associated with neutron star mergers
Shin-ichiro Fujimoto, Masa-aki Hashimoto
We investigate the significance of isomers on a kilonova associated with neutron star mergers (NSMs) for the first time. We calculate the evolution of abundances and energy generat…
The impact of asymmetric neutrino emissions on nucleosynthesis in core-collapse supernovae
Shin-ichiro Fujimoto, Hiroki Nagakura
We investigate the impact of asymmetric neutrino emissions on the explosive nucleosynthesis in neutrino-driven core-collapse supernovae (CCSNe). We find that the asymmetric emissio…
Post-shock-revival evolutions in the neutrino-heating mechanism of core-collapse supernovae
Yu Yamamoto, Shin-ichiro Fujimoto, Hiroki Nagakura +1
We perform some experimental simulations in spherical symmetry and axisymmetry to understand the post-shock-revival evolution of core-collapse supernovae. Assuming that the stalled…
Multimessengers from core-collapse supernovae: multidimensionality as a key to bridge theory and observation
Kei Kotake, Tomoya Takiwaki, Yudai Suwa +4
Core-collapse supernovae are dramatic explosions marking the catastrophic end of massive stars. The only means to get direct information about the supernova engine is from observat…
Explosive Nucleosynthesis in Magnetohydrodynamical Jets from Collapsars II. Heavy-Element Nucleosynthesis of s, r, p-Processes
Masaomi Ono, Masa-aki Hashimoto, Shin-ichiro Fujimoto +2
We investigate the nucleosynthesis in a massive star of 70 M_solar with solar metallicity in the main sequence stage. The helium core mass after hydrogen burning corresponds to 32…
Characterizing Interdisciplinarity of Researchers and Research Topics Using Web Search Engines
Hiroki Sayama, Jin Akaishi
Researchers' networks have been subject to active modeling and analysis. Earlier literature mostly focused on citation or co-authorship networks reconstructed from annotated scient…
Effects of a New Triple-α Reaction on the S-process in Massive Stars
Yukihiro Kikuchi, Masaomi Ono, Yasuhide Matsuo +2
Effects of a new triple-α reaction rate on the s-process during the evolution of a massive star of 25 M\odot are investigated for the first time. Although the s-process in massive…
Explosive nucleosynthesis in the neutrino-driven aspherical supernova explosion of a non-rotating 15 star with solar metallicity
Shin-ichiro Fujimoto, Kei Kotake, Masa-aki Hashimoto +2
We investigate explosive nucleosynthesis in a non-rotating 15 star with solar metallicity that explodes by a neutrino-heating supernova (SN) mechanism aided by both standi…
Nucleosynthesis in Magnetically Driven Jets from Collapsars
Shin-ichiro Fujimoto, Nobuya Nishimura, Masa-aki Hashimoto
We have made detailed calculations of the composition of magnetically driven jets ejected from collapsars, or rapidly rotating massive stars, based on long-term magnetohydrodynamic…
Lithium production on a low-mass secondary in a black hole soft X-ray transient
Shin-ichiro Fujimoto, Ryuichi Matsuba, Kenzo Arai
We examine production of Li on the surface of a low-mass secondary in a black hole soft X-ray transient (BHSXT) through the spallation of CNO nuclei by neutrons which are ejected f…
Reply to 'Comment on 'Heavy element production in inhomogeneous big bang nucleosynthesis''
Shunji Matsuura, Shin-ichirou Fujimoto, Masa-aki Hashimoto +1
This is a reply report to astro-ph/0604264. We studied heavy element production in high baryon density region in early universe astro-ph/0507439. However it is claimed in astro-ph/…
Smearing origin of zero-bias conductance peak in Ag-SiO-Bi-2212 planar tunnel junctions: influence of diffusive normal metal verified with the circuit theory
Iduru Shigeta, Yukio Tanaka, Fusao Ichikawa +1
We propose a new approach of smearing origins of a zero-bias conductance peak (ZBCP) in high-Tc superconductor tunnel junctions through the analysis based on the circuit theory for…
Heavy element nucleosynthesis in a collapsar
Shin-ichirou Fujimoto, Masa-aki Hashimoto, Kei Kotake +1
We investigate synthesis of heavy elements in a collapsar. We have calculated detailed composition of magnetically driven jets ejected from a collapsar, which is based on long-term…
Magnetohydrodynamic Simulations of A Rotating Massive Star Collapsing to A Black Hole
Shin-ichiro Fujimoto, Kei Kotake, Shoichi Yamada +2
We perform two-dimensional, axisymmetric, magnetohydrodynamic simulations of the collapse of a rotating star of 40 Msun and in the light of the collapsar model of gamma-ray burst.…
Heavy Element Production in Inhomogeneous Big Bang Nucleosynthesis
S. Matsuura, S. Fujimoto, S. Nishimura +2
We present a new astrophysical site of the big bang nucleosynthesis (BBN) that are very peculiar compared with the standard BBN. Some models of the baryogenesis suggest that very h…
R-Process Nucleosynthesis in MHD Jet Explosions of Core-Collapse Supernovae
Sunao Nishimura, Kei Kotake, Masa-aki Hashimoto +4
We investigate -process nucleosynthesis during the magnetohydrodynamical (MHD) explosion of supernova in a massive star of 13 . Contrary to the case of the spherical…
Nucleosynthesis inside Gamma-Ray Burst Accretion Disks
S. Fujimoto, M. Hashimoto, K. Arai +1
We investigate nucleosynthesis inside both a gamma-ray burst accretion disk and a wind launched from an inner region of the disk using one-dimensional models of the disk and wind a…