364 citations · 2k across the 41 of their papers we have counts for
33 papers · 1 filter
Probing pre-supernova mass loss in double-peaked Type Ibc supernovae from the Zwicky Transient Facility
Kaustav K. Das, Mansi M. Kasliwal, Jesper Sollerman +34
Eruptive mass loss of massive stars prior to supernova (SN) explosion is key to understanding their evolution and end fate. An observational signature of pre-SN mass loss is the de…
Hydrodynamics and Nucleosynthesis of Jet-Driven Supernovae I: Parameter Study of the Dependence on Jet Energetics
Shing-Chi Leung, Ken'ichi Nomoto, Tomoharu Suzuki
Rotating massive stars with initial progenitor masses 25 -- 140 can leave rapidly rotating black holes to become collapsars. The b…
Accretion-induced Collapse of Dark Matter-admixed Rotating White Dwarfs: Dynamics and Gravitational-wave Signals
Ho-Sang Chan, Ming-chung Chu, Shing-Chi Leung
We present two-dimensional hydrodynamic simulations of the accretion-induced collapse (AIC) of rotating white dwarfs admixed with an extended component of dark matter (DM) comprisi…
R-process Nucleosynthesis of Subminimal Neutron Star Explosions
Chun-Ming Yip, Ming-Chung Chu, Shing-Chi Leung +1
We show that a minimum-mass neutron star undergoes delayed explosion after mass removal from its surface. We couple the Newtonian hydrodynamics to a nuclear reaction network of $\s…
The Late-Time Light Curves of Type Ia Supernovae: Confronting Models with Observations
Vishal Tiwari, Or Graur, Robert Fisher +5
Type Ia supernovae (SNe Ia) play a crucial role as standardizable candles in measurements of the Hubble constant and dark energy. Increasing evidence points towards multiple possib…
A New Versatile Code for Gamma-Ray Monte-Carlo Radiative Transfer
Shing-Chi Leung
Ongoing MeV telescopes such as INTEGRAL/SPI and Fermi/GBM, and proposed telescopes including the recently accepted COSI and the e-ASTROGAM and AMEGO missions, provide another windo…
Gamma-Ray Light Curves and Spectra of Classical Novae
Shing-Chi Leung, Thomas Siegert
The nucleosynthesis in classical novae, in particular that of radioactive isotopes, is directly measurable by its -ray signature. Despite decades of observations, MeV -rays f…
Hydrodynamic Simulations of Electron-capture Supernovae: Progenitor and Dimension Dependence
Shuai Zha, Evan P. O'Connor, Sean M. Couch +2
We present neutrino-transport hydrodynamic simulations of electron-capture supernovae (ECSNe) in \texttt{FLASH} with new two-dimensional (2D) collapsing progenitor models. These pr…
Type Ia Supernovae and their Explosive Nucleosynthesis: Constraints on Progenitors
Shing-Chi Leung, Ken'ichi Nomoto
What the progenitors of Type Ia supernovae (SNe Ia) are, whether they are near-Chandrasekhar mass or sub-Chandrasekhar mass white dwarfs, has been the matter of debate for decades.…
Dark Matter-admixed Rotating White Dwarfs as Peculiar Compact Objects
H-S. Chan, M-C. Chu, S-C. Leung
The discoveries of anomalous compact objects challenge our understanding of the standard theory of stellar structures and evolution. They serve as an excellent laboratory to search…
Spatially Resolved X-ray Study of Supernova Remnant G306.30.9 with Unusually High Calcium Abundance
Jianbin Weng, Ping Zhou, Yang Chen +6
G306.30.9 is an asymmetric Galactic supernova remnant (SNR), whose progenitor has been thought to be a Type Ia supernova (SN), but its high Ca abundance appears inconsistent wit…
Discovery of the Highly-Neutronized Ejecta Clump with Enhanced Abundances of Titanium and Chromium in the Type Ia Supernova Remnant 3C 397
Yuken Ohshiro, Hiroya Yamaguchi, Shing-Chi Leung +7
The supernova remnant (SNR) 3C 397 is thought to originate from a Type Ia supernova (SN Ia) explosion of a near-Chandrasekhar-mass () progenitor, based on the enhanced…
Fast Blue Optical Transients due to Circumstellar Interaction and the Mysterious Supernova SN 2018gep
Shing-Chi Leung, Jim Fuller, Ken'ichi Nomoto
The discovery of SN 2018gep (ZTF18abukavn) challenged our understanding of the late-phase evolution of massive stars and their supernovae (SNe). The fast rise in luminosity of this…
Delayed Detonation Thermonuclear Supernovae With An Extended Dark Matter Component
H-S. Chan, M-C. Chu, S-C. Leung +1
We present simulations of thermonuclear supernovae admixed with an extended component of fermionic cold dark matter. We consider the explosion of a Chandrasekhar-mass white dwarf u…
Exploration of Aspherical Ejecta Properties in Type Ia Supernova: Progenitor Dependence and Applications to Progenitor Classification
Shing-Chi Leung, Roland Diehl, Ken'ichi Nomoto +1
Several explosions of thermonuclear supernovae (SNe Ia) have been found to exhibit deviations from spherical symmetry upon closer inspection. Examples are the gamma-ray lines from…
Hydrodynamic Simulations of Pre-Supernova Outbursts in Red Supergiants: Asphericity and Mass Loss
Shing-Chi Leung, Jim Fuller
The activity of massive stars approaching core-collapse can strongly affect the appearance of the star and its subsequent supernova. Late-phase convective nuclear burning generates…
A Model for Fast Blue Optical Transient AT2018Cow: Circumstellar Interaction of a Pulsational Pair-instability Supernova
Shing-Chi Leung, Sergei Blinnikov, Ken'ichi Nomoto +3
The Fast Blue Optical Transient (FBOT) ATLAS18qqn (AT2018cow) has a light curve as bright as superluminous supernovae but rises and falls much faster. We model this light curve by…
Explosive Nucleosynthesis in Near-Chandrasekhar-mass White Dwarf Models for Type Iax Supernovae: Dependence on Model Parameters
Shing-Chi Leung, Ken'ichi Nomoto
The recently observed diversity of Type Ia supernovae (SNe Ia) has motivated us to conduct the theoretical modeling of SNe Ia for a wide parameter range. In particular, the origin…
Pulsational Pair-instability Supernovae. II. Neutrino Signals from Pulsations and their Detection by Terrestrial Neutrino Detectors
Shing-Chi Leung, Sergei Blinnikov, Koji Ishidoshiro +2
A Pulsational Pair-instability supernova (PPISN) evolves from a massive star with a mass -- 140 which develops the electron-positron pair-instability after th…
Three-dimensional Models of Core-collapse Supernovae From Low-mass Progenitors With Implications for Crab
G. Stockinger, H. -Th. Janka, D. Kresse +9
We present 3D full-sphere supernova simulations of non-rotating low-mass (~9 Msun) progenitors, covering the entire evolution from core collapse through bounce and shock revival, t…
Chemical abundances in Sgr A East: evidence for a Type Iax supernova remnant
Ping Zhou, Shing-Chi Leung, Zhiyuan Li +3
Recent observations have shown a remarkable diversity of observational behaviors and explosion mechanisms in thermonuclear supernovae (SNe). An emerging class of peculiar thermonuc…
Accretion-Induced Collapse of Dark Matter Admixed White Dwarfs -- II: Rotation and Gravitational-wave Signals
Shuai Zha, Ming-Chung Chu, Shing-Chi Leung +1
We present axisymmetric hydrodynamical simulations of accretion-induced collapse (AIC) of dark matter (DM) admixed rotating white dwarfs (WD) and their burst gravitational-wave (GW…
Accretion-Induced Collapse of Dark Matter Admixed White Dwarfs -- I: Formation of Low-mass Neutron Stars
Shing-Chi Leung, Shuai Zha, Ming-Chung Chu +2
Recently observed pulsars with masses challenge the conventional neutron star (NS) formation path by core-collapse supernova (CCSN). Using spherically symmetr…
Evolution of ONeMg Core in Super-AGB Stars towards Electron-Capture Supernovae: Effects of Updated Electron-Capture Rate
Shuai Zha, Shing-Chi Leung, Toshio Suzuki +1
Stars with evolve to form a strongly degenerate ONeMg core. When the core mass becomes close to the Chandrasekhar mass, the core undergoes electron captures…