220 citations · 1.1k across the 33 of their papers we have counts for
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The Impact of Angular Momentum Loss on the Outcomes of Binary Mass Transfer
Reinhold Willcox, Morgan MacLeod, Ilya Mandel +1
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 orbit…
Constraining mass transfer and common-envelope physics with post-supernova companion monitoring
Ryosuke Hirai
We present an analytical model that describes the response of companion stars after being impacted by a supernova in a close binary system. This model captures key properties of th…
Common envelopes in massive stars II: The distinct roles of hydrogen and helium recombination
Mike Y. M. Lau, Ryosuke Hirai, Daniel J. Price +1
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…
Common envelope binary interaction simulations between a thermally-pulsating AGB star and a low mass companion
Miguel Gonzalez-Bolivar, Orsola De Marco, Mike Y. M. Lau +2
At least one in five of all planetary nebulae are the product of a common envelope (CE) interaction, where the companion in-spirals into the envelope of an asymptotic giant branch…
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…
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…
Simulating the formation of Carinae's surrounding nebula through unstable triple evolution and stellar merger-induced eruption
Ryosuke Hirai, Philipp Podsiadlowski, Stanley P. Owocki +2
Carinae is an extraordinary massive star famous for its 19th century Great Eruption and the surrounding Homunculus nebula ejected in that event. The cause of this eruption has…
Formation pathway for lonely stripped-envelope supernova progenitors: implications for Cassiopeia A
Ryosuke Hirai, Toshiki Sato, Philipp Podsiadlowski +2
We explore a new scenario for producing stripped-envelope supernova progenitors. In our scenario, the stripped-envelope supernova is the second supernova of the binary, in which th…
Origins of Type Ibn SNe 2006jc/2015G in interacting binaries and implications for pre-SN eruptions
Ning-Chen Sun, Jusytn R. Maund, Ryosuke Hirai +2
Type Ibn supernovae (SNe Ibn) are intriguing stellar explosions whose spectra exhibit narrow helium lines with little hydrogen. They trace the presence of circumstellar material (C…
Hydrodynamical simulations and similarity relations for eruptive mass loss from massive stars
Stanley P. Owocki, Ryo Hirai, Philipp Podsiadlowski +1
Motivated by the eruptive mass loss inferred from Luminous Blue Variable (LBV) stars, we present 1D hydrodynamical simulations of the response from sudden energy injection into the…