5 papers
Evolution of Massive Main-sequence Stars in Rapid Population Synthesis. I. Framework and Implementation
Adam BrÄek, Ryosuke Hirai, Ilya Mandel +1
Stars spend most of their lifetime on the main sequence (MS), where hydrogen burning establishes the internal chemical structure that governs the subsequent evolution. In massive s…
Mass transfer stability for AM CVn binaries with white dwarf donors
Lucy O. McNeill, Ryosuke Hirai
Double white dwarf binaries (DWDBs) with Helium components are progenitors to AM CVn binary systems. Their Galactic production rate may be given by the number of stably mass transf…
Tidal heating in detached double white dwarf binaries
Lucy O. McNeill, Ryosuke Hirai
Short--period (1 hr orbits) detached double white dwarf binary (DWDB) components identified with transient surveys (e.g. SDSS, ZTF) have hot surface temperatures (10,000 K)…
NinjaSat monitoring of Type-I X-ray bursts from the clocked burster SRGA J144459.2604207
Tomoshi Takeda, Toru Tamagawa, Teruaki Enoto +25
The CubeSat X-ray observatory NinjaSat was launched on 2023 November 11 and has provided opportunities for agile and flexible monitoring of bright X-ray sources. On 2024 February 2…
Evidence of non-Solar elemental composition in the clocked X-ray burster SRGA J144459.2604207
Akira Dohi, Nobuya Nishimura, Ryosuke Hirai +13
In February and March 2024, a series of many Type I X-ray bursts from the accreting neutron star SRGA J144459.2604207, which has been identified by multiple X-ray satellites, wi…