890 citations · 10.3k across the 163 of their papers we have counts for
21 papers · 1 filter
Impacts of the reaction rate on nucleosynthesis in pair-instability supernovae
Hiroki Kawashimo, Ryo Sawada, Yudai Suwa +3
Nuclear reactions are key to our understanding of stellar evolution, particularly the rate, which is known to significantly influence the…
The p-process in exploding rotating massive stars
A. Choplin, S. Goriely, R. Hirschi +2
The p-process nucleosynthesis can explain proton-rich isotopes that are heavier than iron, which are observed in the Solar System, but discrepancies still persist and important que…
Four-hundred Very Metal-Poor Stars Studied with LAMOST and Subaru. II. Elemental abundances
Haining Li, Wako Aoki, Tadafumi Matsuno +9
We present homogeneous abundance analysis of over 20 elements for 385 very metal-poor (VMP) stars based on the LAMOST survey and follow-up observations with the Subaru Telescope. I…
Four-hundred Very Metal-poor Stars studied with LAMOST and Subaru. I. Survey Design, Follow-up Program, and Binary Frequency
Wako Aoki, Haining Li, Tadafumi Matsuno +11
The chemical abundances of very metal-poor stars provide important constraints on the nucleosynthesis of the first generation of stars and early chemical evolution of the Galaxy. W…
A strong neutron burst in jet-like supernovae of spinstars
A. Choplin, N. Tominaga, B. S. Meyer
Some metal-poor stars have abundance patterns which are midway between the slow (s) and rapid (r) neutron capture processes. We show that the helium shell of a fast rotating massiv…
Inferring the velocity of early massive stars from the abundances of extremely metal-poor stars
Arthur Choplin, Nozomu Tominaga, M. N. Ishigaki
The nature of the first massive stars may be inferred by investigating the origin of the extremely metal-poor (EMP) stars, likely formed from the ejecta of one or a few previous ma…
Evidence for an aspherical Population III supernova explosion inferred from the hyper metal-poor star HE1327-2326
Rana Ezzeddine, Anna Frebel, Ian U. Roederer +6
We present observational evidence that an aspherical supernova explosion could have occurred in the First stars in the early universe. Our results are based on the First determinat…
The Initial mass function of the first stars inferred from extremely metal-poor stars
Miho N. Ishigaki, Nozomu Tominaga, Chiaki Kobayashi +1
We compare elemental abundance patterns of extremely metal-poor (EMP; [Fe/H]) stars with supernova yields of metal-free stars in order to obtain insights into the c…
J-GEM Follow-Up Observations to Search for an Optical Counterpart of The First Gravitational Wave Source GW150914
Tomoki Morokuma, Masaomi Tanaka, Yuichiro Asakura +22
We present our optical follow-up observations to search for an electromagnetic counterpart of the first gravitational wave source GW150914 in the framework of the Japanese collabor…
OISTER Optical and Near-Infrared Observations of the Super-Chandrasekhar Supernova Candidate SN 2012dn: Dust Emission from the Circumstellar Shell
Masayuki Yamanaka, Keiichi Maeda, Masaomi Tanaka +34
We present extensively dense observations of the super-Chandrasekhar supernova (SC SN) candidate SN 2012dn from to days after the date of its -band maximum in the o…
Multicolor light curves simulations of Population III core-collapse supernovae: from shock breakout to Co decay
Alexey Tolstov, Ken'ichi Nomoto, Nozomu Tominaga +3
The properties of the first generation of stars and their supernova (SN) explosions remains unknown due to the lack of their actual observations. Recently many transient surveys ar…
The Rise-Time of Type II Supernovae
Santiago Gonzalez-Gaitan, N. Tominaga, J. Molina +14
We investigate the early-time light-curves of a large sample of 223 type II supernovae (SNe) from the Sloan Digital Sky Survey and the Supernova Legacy Survey. Having a cadence of…
OISTER Optical and Near-Infrared Observations of Type Iax Supernova 2012Z
Masayuki Yamanaka, Keiichi Maeda, Koji S. Kawabata +30
We report observations of the Type Iax supernova (SN Iax) 2012Z at optical and near-infrared wavelengths from immediately after the explosion until days after the maxi…
Abundance Profiling of Extremely Metal-Poor Stars and Supernova Properties in the Early Universe
Nozomu Tominaga, Nobuyuki Iwamoto, Ken'ichi Nomoto
After the Big Bang nucleosynthesis, the first heavy element enrichment in the Universe was made by a supernova (SN) explosion of a population (Pop) III star (Pop III SN). The abund…
Chemical Analysis of the Ninth Magnitude Carbon-Enhanced Metal-Poor Star BD+44 493
H. Ito, W. Aoki, T. C. Beers +2
We present detailed chemical abundances for the bright carbon-enhanced metal-poor (CEMP) star BD+44 493, previously reported on by Ito et al. Our measurements confirm that BD+44 49…
Early UV/Optical Emission of The Type Ib SN 2008D
Melina C. Bersten, Masaomi Tanaka, Nozomu Tominaga +2
We propose an alternative explanation for the post-breakout emission of SN 2008D associated with the X-ray transient 080109. Observations of this object show a very small contrast…
First Detection of Ar-K Line Emission from the Cygnus Loop
H. Uchida, H. Tsunemi, N. Tominaga +5
We observed the Cygnus Loop with XMM-Newton (9 pointings) and Suzaku (32 pointings) between 2002 and 2008. The total effective exposure time is 670.2 ks. By using all of the availa…
Supernovae from Red Supergiants with Extensive Mass Loss
Takashi Moriya, Nozomu Tominaga, Sergei I. Blinnikov +2
We calculate multicolor light curves (LCs) of supernovae (SNe) from red supergiants (RSGs) exploded within dense circumstellar medium (CSM). Multicolor LCs are calculated by using…
Observations of the Optical Transient in NGC 300 with AKARI/IRC: Possibilities of Asymmetric Dust Formation
R. Ohsawa, I. Sakon, T. Onaka +10
We present the results of near-infrared (NIR) multi-epoch observations of the optical transient in the nearby galaxy NGC300 (NGC300-OT) at 398 and 582 days after the discovery with…
Formation and Evolution of Dust in Type IIb Supernova with Application to the Cassiopeia A Supernova Remnant
Takaya Nozawa, Takashi Kozasa, Nozomu Tominaga +4
We investigate the formation of dust grains in the ejecta of a SN IIb and their evolution in the shocked gas in the SNR by considering the uniform and power-law density structures…
Chemical Yields from Supernovae and Hypernovae
Ken'ichi Nomoto, Shinya Wanajo, Yasuomi Kamiya +2
We review the final stages of stellar evolution, supernova properties, and chemical yields as a function of the progenitor's mass M. (1) 8 - 10 Ms stars are super-AGB stars when th…