Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Ryosuke Hirai"'
Publikováno v:
The Astrophysical Journal Letters, Vol 972, Iss 1, p L18 (2024)
Recent neutron star surface observations corroborate a long-standing theory that neutron stars may be accelerated over extended periods after their birth. We analyze how these prolonged rocket-like accelerations, combined with rapid birth kicks, impa
Externí odkaz:
https://doaj.org/article/e725ef363d184f1bbd25f53b51b162ab
Publikováno v:
The Astrophysical Journal Letters, Vol 970, Iss 2, p L42 (2024)
Wolf–Rayet stars in close binary systems can be tidally spun up by their companions, potentially leaving behind fast-spinning, highly magnetized neutron stars, known as “magnetars,” after core collapse. These newborn magnetars can transfer rota
Externí odkaz:
https://doaj.org/article/3b1a8e2333f743d39cfe011100d822da
Publikováno v:
The Astrophysical Journal Letters, Vol 966, Iss 1, p L7 (2024)
Accreting main-sequence stars expand significantly when the mass accretion timescale is much shorter than their thermal timescales. This occurs during mass transfer from an evolved giant star onto a main-sequence companion in a binary system and is a
Externí odkaz:
https://doaj.org/article/d57ad713863b4b6aa23a89518c0204df
Autor:
Athira Menon, Andrea Ercolino, Miguel A. Urbaneja, Daniel J. Lennon, Artemio Herrero, Ryosuke Hirai, Norbert Langer, Abel Schootemeijer, Emmanouil Chatzopoulos, Juhan Frank, Sagiv Shiber
Publikováno v:
The Astrophysical Journal Letters, Vol 963, Iss 2, p L42 (2024)
Blue supergiants are the brightest stars in their host galaxies, and yet their evolutionary status has been a long-standing problem in stellar astrophysics. In this pioneering work, we present a large sample of 59 early B-type supergiants in the Larg
Externí odkaz:
https://doaj.org/article/5ed4309eb16e4e6db9e63bfcba502060
Autor:
Ryosuke Hirai, Seiji Kawano, Shoko Inoo, Sakiko Kuraoka, Shotaro Okanoue, Takuya Satomi, Kenta Hamada, Yoshiyasu Kono, Hiromitsu Kanzaki, Masaya Iwamuro, Yoshiro Kawahara, Hiroyuki Okada
Publikováno v:
Gut and Liver, Vol 17, Iss 3, Pp 404-411 (2023)
Background/Aims: The safety of gastric endoscopic submucosal dissection (ESD) in users of a P2Y12 receptor antagonist (P2Y12RA) under current guidelines has not been verified. Methods: Patients treated by gastric ESD at Okayama University Hospital be
Externí odkaz:
https://doaj.org/article/90e3cf6438da4a80ba685c866555ead2
Publikováno v:
The Astrophysical Journal, Vol 969, Iss 1, p 1 (2024)
We explore the evolution of massive stars (>8 M _⊙ ) with 1D models and present analytical fits to the masses and binding energies of the convective portions of their envelopes. These fits are given as functions of total mass, metallicity, and surf
Externí odkaz:
https://doaj.org/article/176f2bc9dbbb4369a938c1ad73e98545
Publikováno v:
The Astrophysical Journal, Vol 958, Iss 2, p 138 (2023)
We use the rapid binary population synthesis code COMPAS to investigate commonly used prescriptions for the determination of mass transfer stability in close binaries and the orbital separations after stable mass transfer. The degree of orbital tight
Externí odkaz:
https://doaj.org/article/76b3bf6c8d4349a3991da24726d0d279
Autor:
Ryosuke Hirai, Mami Hirai, Yuichi Shimodate, Mariko Minami, Sho Ishikawa, Takafumi Kanadani, Rio Takezawa, Akira Doi, Naoyuki Nishimura, Hirokazu Mouri, Kazuhiro Matsueda, Hiroshi Yamamoto, Motowo Mizuno
Publikováno v:
Health Science Reports, Vol 4, Iss 3, Pp n/a-n/a (2021)
Abstract Background and aims We have started a new population‐based endoscopic gastric cancer screening program in Kurashiki city with consideration of Helicobacter pylori infection status based on endoscopic features. We aimed to verify the feasib
Externí odkaz:
https://doaj.org/article/af7de4a4defb497c8716ca4ba4c98134
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 516:4669-4678
The role of recombination during a common-envelope event has been long debated. Many studies have argued that much of hydrogen recombination energy, which is radiated in relatively cool and optically-thin layers, might not thermalise in the envelope.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46ac1ac46a73993cf1b41257a0d11d08
https://doi.org/10.1093/mnras/stac2490
https://doi.org/10.1093/mnras/stac2490
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 513:4802-4813
Most neutron stars (NSs) and black holes (BHs) are believed to be the final remnants in the evolution of massive stars. In this study, we propose a new formation channel for the formation of BHs and peculiar NSs (specifically, magnetars and Thorne-$\
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8c2f6bf2cfb39c2dc308fde84cc393aa
https://doi.org/10.1093/mnras/stac631
https://doi.org/10.1093/mnras/stac631