364 citations · 2k across the 41 of their papers we have counts for
41 papers
Comment on the feasibility of carbon burning in Betelgeuse: a response to "The evolutionary stage of Betelgeuse inferred from its pulsation periods," arXiv:2306.00287
László Molnár, Meridith Joyce, Shing-Chi Leung
The recent pre-print by Saio et al. 2023 argues that the supergiant Betelgeuse is already undergoing carbon burning, based on the assumption that all of its light variations are ca…
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…
Wave-driven mass loss of stripped envelope massive stars: progenitor-dependence, mass ejection, and supernovae
Shing-Chi Leung, Samantha Wu, Jim Fuller
The discovery of rapidly rising and fading supernovae powered by circumstellar interaction has suggested the pre-supernova mass eruption phase as a critical phenomenon in massive s…
Origin of metals in old Milky Way halo stars based on GALAH and Gaia
Miho N. Ishigaki, Tilman Hartwig, Yuta Tarumi +6
Stellar and supernova nucleosynthesis in the first few billion years of the cosmic history have set the scene for early structure formation in the Universe, while little is known a…
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…