220 citations · 1.1k across the 33 of their papers we have counts for
8 papers · 1 filter
An environmental analysis of the Type Ib SN 2019yvr and the possible presence of an inflated binary companion
Ning-Chen Sun, Justyn R. Maund, Paul A. Crowther +5
SN 2019yvr is the second Type Ib supernova (SN) with a possible direct detection of its progenitor (system); however, the spectral energy distribution (SED) of the pre-explosion so…
Common envelopes in massive stars: Towards the role of radiation pressure and recombination energy in ejecting red supergiant envelopes
Mike Y. M. Lau, Ryosuke Hirai, Miguel González-Bolívar +3
We perform 3D hydrodynamical simulations of a common-envelope event involving a 12 solar mass red supergiant donor. Massive stars are expected to be qualitatively different from lo…
Rapid stellar and binary population synthesis with COMPAS
Team COMPAS, :, Jeff Riley +23
Compact Object Mergers: Population Astrophysics and Statistics (COMPAS; https://compas.science) is a public rapid binary population synthesis code. COMPAS generates populations of…
Stellar Core-Merger-Induced Collapse: New Formation Pathways for Black Holes, Thorne-ytkow objects, Magnetars and Superluminous Supernovae
Iminhaji Ablimit, Philipp Podsiadlowski, Ryosuke Hirai +1
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 fo…
Conditions for accretion disc formation and observability of wind-accreting X-ray binaries
Ryosuke Hirai, Ilya Mandel
We explore the effect of anisotropic wind driving on the properties of accretion onto black holes in close binaries. We specifically focus on line-driven winds, which are common in…
Supernova explosions in active galactic nuclear discs
Evgeni Grishin, Alexey Bobrick, Ryosuke Hirai +2
Active galactic nuclei (AGN) are prominent environments for stellar capture, growth and formation. These environments may catalyze stellar mergers and explosive transients, such as…
Observability of inflated companion stars after supernovae in massive binaries
Misa Ogata, Ryosuke Hirai, Kotaro Hijikawa
We carry out a systematic study of the response of companion stars in massive binaries after being impacted by supernova ejecta. A total of 720 1D stellar evolution calculations ar…
Wind mass-loss rates of stripped stars inferred from Cygnus X-1
Coenraad J. Neijssel, Serena Vinciguerra, Alejandro Vigna-Gomez +5
Recent observations of the high-mass X-ray binary Cygnus X-1 have shown that both the companion star (41 solar masses) and the black hole (21 solar masses) are more massive than pr…