Zobrazeno 1 - 10
of 101
pro vyhledávání: '"Sawada, Ryo"'
Autor:
Matsunaga, Kai, Uchida, Hiroyuki, Enokiya, Rei, Sato, Toshiki, Sawada, Ryo, Umeda, Hideyuki, Narita, Takuto, Tsuru, Takeshi Go
It is generally hard to put robust constraints on progenitor masses of supernovae (SNe) and remnants (SNRs) observationally, while they offer tantalizing clues to understanding explosion mechanisms and mass distribution. Our recent study suggests tha
Externí odkaz:
http://arxiv.org/abs/2405.20736
Autor:
Sato, Toshiki, Matsunaga, Kai, Sawada, Ryo, Takahashi, Koh, Suwa, Yudai, Hughes, John P., Uchida, Hiroyuki, Narita, Takuto, Umeda, Hideyuki
Simulations of pre-supernova evolution suggest that some intense shell burning can be so active that, in extreme cases, it can merge with the outer shell, changing the initial conditions for the supernova explosion. However, such violent activity in
Externí odkaz:
http://arxiv.org/abs/2403.04156
Publikováno v:
The Astrophysical Journal, 2024, Volume 963, Number 1
The early solar system contained a short-lived radionuclide, $^{26}$Al (its half-life time $t_{1/2} = 0.7$ Myr). The decay energy $^{26}$Al is thought to have controlled the thermal evolution of planetesimals and, possibly, the water contents of plan
Externí odkaz:
http://arxiv.org/abs/2312.01948
Binary Interaction Can Yield a Diversity of Circumstellar Media around Type II Supernova Progenitors
Autor:
Matsuoka, Tomoki, Sawada, Ryo
Recent observations of supernovae (SNe) have indicated that a fraction of massive stars possess dense circumstellar medium (CSM) at the moment of their core collapses. They suggest the presence of additional activities of the SN progenitor driving th
Externí odkaz:
http://arxiv.org/abs/2307.00727
This paper provides collapses of massive, fully convective, and non-rotating white dwarfs (WDs) formed by accretion-induced collapse or merger-induced collapse and the subsequent explosions with the general relativistic neutrino-radiation hydrodynami
Externí odkaz:
http://arxiv.org/abs/2306.17381
Autor:
Kawashimo, Hiroki, Sawada, Ryo, Suwa, Yudai, Moriya, Takashi J., Tanikawa, Ataru, Tominaga, Nozomu
Nuclear reactions are key to our understanding of stellar evolution, particularly the $^{12}\rm{C}\left({\alpha},{\gamma}\right)^{16}\!\rm{O}$ rate, which is known to significantly influence the lower and upper ends of the black hole (BH) mass distri
Externí odkaz:
http://arxiv.org/abs/2306.01682
Autor:
Sawada, Ryo, Suwa, Yudai
Details of the core-collapse supernova (CCSN) explosion mechanism still need to be fully understood. There is an increasing number of successful examples of reproducing explosions in multidimensional hydrodynamic simulations, but subsequent studies p
Externí odkaz:
http://arxiv.org/abs/2301.03610
Explosion mechanism of core-collapse supernovae is not fully understood yet. In this work, we give constraints on the explosion timescale based on $^{56}$Ni synthesized by supernova explosions. First, we systematically analyze multi-band light curves
Externí odkaz:
http://arxiv.org/abs/2205.00624
We consider fallback accretion after an ultra-stripped supernova (USSN) that accompanies formation of a binary neutron star (BNS) or a neutron star-black hole binary (NS-BH). The fallback matter initially accretes directly to the nascent NS, while it
Externí odkaz:
http://arxiv.org/abs/2204.08851
Autor:
Nakamura, Ryota, Yamada, Tadaaki, Tokuda, Shinsaku, Morimoto, Kenji, Katayama, Yuki, Matsui, Yohei, Hirai, Soichi, Ishida, Masaki, Kawachi, Hayato, Sawada, Ryo, Tachibana, Yusuke, Osoegawa, Atsushi, Horinaka, Mano, Sakai, Toshiyuki, Yasuhiro, Tomoko, Kozaki, Ryohei, Yano, Seiji, Takayama, Koichi
Publikováno v:
In Cancer Letters 28 August 2024 598