Daniel Kasen
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View article: The Most Luminous Known Fast Blue Optical Transient AT 2024wpp: Unprecedented Evolution and Properties in the X-Rays and Radio
The Most Luminous Known Fast Blue Optical Transient AT 2024wpp: Unprecedented Evolution and Properties in the X-Rays and Radio Open
We present X-ray (0.3–79 keV) and radio (0.25–203 GHz) observations of the most luminous fast blue optical transient (LFBOT) AT 2024wpp at z = 0.0868, spanning 2–280 days after first light. AT 2024wpp shows luminous ( L X ≈ 1.5 × 10 43 erg…
View article: An Integral-based Technique to Accelerate the Monte Carlo Radiative Transfer Computation for Supernovae
An Integral-based Technique to Accelerate the Monte Carlo Radiative Transfer Computation for Supernovae Open
We present an integral-based technique (IBT) algorithm to accelerate supernova (SN) radiative transfer calculations. The algorithm utilizes “integral packets,” which are calculated by the path integral of the Monte Carlo (MC) energy packet…
View article: Simulated 3D $^{56}$Ni Distributions of Type IIp Supernovae
Simulated 3D $^{56}$Ni Distributions of Type IIp Supernovae Open
We present the first three-dimensional study of the asymptotic ejecta distributions for a suite of theoretical Type IIp supernovae originating from red supergiant progenitors. We simulate using the radiation-hydrodynamic code F{\sc{ornax}}…
View article: 2D end-to-end modelling of kilonovae from binary neutron star merger remnants
2D end-to-end modelling of kilonovae from binary neutron star merger remnants Open
We investigate the kilonova emission resulting from outflows produced in a 3D general-relativistic magnetohydrodynamic (GRMHD) simulation of a hypermassive neutron star (HMNS) remnant. We map the outflows into the flash hydrodynamics code …
View article: The Most Luminous Known Fast Blue Optical Transient AT 2024wpp: Unprecedented Evolution and Properties in the X-rays and Radio
The Most Luminous Known Fast Blue Optical Transient AT 2024wpp: Unprecedented Evolution and Properties in the X-rays and Radio Open
We present X-ray (0.3--79 keV) and radio (0.25--203 GHz) observations of the most luminous Fast Blue Optical Transient (LFBOT) AT\,2024wpp at $z=0.0868$, spanning 2--280 days after first light. AT 2024wpp shows luminous ($L_{\rm X} \approx…
View article: The Gravity Collective: A Comprehensive Analysis of the Electromagnetic Search for the Binary Neutron Star Merger GW190425
The Gravity Collective: A Comprehensive Analysis of the Electromagnetic Search for the Binary Neutron Star Merger GW190425 Open
We present an ultraviolet to infrared search for the electromagnetic (EM) counterpart to GW190425, the second ever binary neutron star merger discovered by the LIGO-Virgo-KAGRA Collaboration. GW190425 was more distant and had a larger loca…
View article: SEDONA-GesaRaT: an AI-Accelerated Radiative Transfer Program for 3-D Supernova Simulations
SEDONA-GesaRaT: an AI-Accelerated Radiative Transfer Program for 3-D Supernova Simulations Open
We present SEDONA-GesaRaT, a rapid code for supernova radiative transfer simulation developed based on the Monte-Carlo radiative transfer code SEDONA. We use a set of atomic physics neural networks (APNN), an artificial intelligence (AI) s…
View article: Neutrino heating in 1D, 2D, and 3D core-collapse supernovae: characterizing the explosion of high-compactness stars
Neutrino heating in 1D, 2D, and 3D core-collapse supernovae: characterizing the explosion of high-compactness stars Open
Massive stars can end their lives with a successful supernova explosion (leaving behind a neutron star or, more rarely, a black hole), or a failed explosion that leaves behind a black hole. The density structure of the pre-collapse progeni…
View article: A 3D Simulation of a Type II-P Supernova: From Core Bounce to beyond Shock Breakout
A 3D Simulation of a Type II-P Supernova: From Core Bounce to beyond Shock Breakout Open
In order to better connect core-collapse supernova (CCSN) theory with its observational signatures, we have developed a simulation pipeline from the onset of the core collapse to beyond shock breakout from the stellar envelope. Using this …
View article: A 3D Simulation of a Type II-P Supernova: from Core Bounce to Beyond Shock Breakout
A 3D Simulation of a Type II-P Supernova: from Core Bounce to Beyond Shock Breakout Open
In order to better connect core-collapse supernovae (CCSN) theory with its observational signatures, we have developed a simulation pipeline from the onset of core collapse to beyond shock breakout. Using this framework, we present a three…
View article: Impact of Systematic Modeling Uncertainties on Kilonova Property Estimation
Impact of Systematic Modeling Uncertainties on Kilonova Property Estimation Open
The precise atomic structure and therefore the wavelength-dependent opacities of lanthanides are highly uncertain. This uncertainty introduces systematic errors in modeling transients like kilonovae and estimating key properties such as ma…
View article: An Integral-Based Technique (IBT) to Accelerate the Monte-Carlo Radiative Transfer Computation for Supernovae
An Integral-Based Technique (IBT) to Accelerate the Monte-Carlo Radiative Transfer Computation for Supernovae Open
We present an integral-based technique (IBT) algorithm to accelerate supernova (SN) radiative transfer calculations. The algorithm utilizes ``integral packets'', which are calculated by the path integral of the Monte-Carlo energy packets, …
View article: The Landscape of Thermal Transients from Supernovae Interacting with a Circumstellar Medium
The Landscape of Thermal Transients from Supernovae Interacting with a Circumstellar Medium Open
The interaction of supernova ejecta with a surrounding circumstellar medium (CSM) generates a strong shock, which can convert ejecta kinetic energy into observable radiation. Given the diversity of potential CSM structures (arising from di…
View article: Impact of Systematic Modeling Uncertainties on Kilonova Property Estimation
Impact of Systematic Modeling Uncertainties on Kilonova Property Estimation Open
The precise atomic structure and therefore the wavelength-dependent opacities of lanthanides are highly uncertain. This uncertainty introduces systematic errors in modeling transients like kilonovae and estimating key properties such as ma…
View article: The Gravity Collective: A Comprehensive Analysis of the Electromagnetic Search for the Binary Neutron Star Merger GW190425
The Gravity Collective: A Comprehensive Analysis of the Electromagnetic Search for the Binary Neutron Star Merger GW190425 Open
We present an ultraviolet-to-infrared search for the electromagnetic (EM) counterpart to GW190425, the second-ever binary neutron star (BNS) merger discovered by the LIGO-Virgo-KAGRA Collaboration (LVK). GW190425 was more distant and had a…
View article: JWST detection of a supernova associated with GRB 221009A without an r-process signature
JWST detection of a supernova associated with GRB 221009A without an r-process signature Open
Identifying the sites of r-process nucleosynthesis, a primary mechanism of heavy element production, is a key goal of astrophysics. The discovery of the brightest gamma-ray burst (GRB) to date, GRB 221009A, presented an opportunity to spec…
View article: The rapid reddening and featureless optical spectra of the optical counterpart of GW170817, at 2017gfo, during the first four days
The rapid reddening and featureless optical spectra of the optical counterpart of GW170817, at 2017gfo, during the first four days Open
We present the spectroscopic evolution of AT 2017gfo, the optical counterpart of the first binary neutron star (BNS) merger detected by LIGO and Virgo, GW170817. While models have long predicted that a BNS merger could produce a kilonova (…
View article: Erratum: “Non-local Thermodynamic Equilibrium Radiative Transfer Simulations of Sub-Chandrasekhar-mass White Dwarf Detonations” (2021, ApJL, 909, L18)
Erratum: “Non-local Thermodynamic Equilibrium Radiative Transfer Simulations of Sub-Chandrasekhar-mass White Dwarf Detonations” (2021, ApJL, 909, L18) Open
International audience
View article: Large-scale Evolution of Seconds-long Relativistic Jets from Black Hole–Neutron Star Mergers
Large-scale Evolution of Seconds-long Relativistic Jets from Black Hole–Neutron Star Mergers Open
We present the first numerical simulations that track the evolution of a black hole–neutron star (BH–NS) merger from premerger to r ≳ 10 11 cm. The disk that forms after a merger of mass ratio q = 2 ejects massive disk winds (3–5 × 10 −2 M…
View article: JWST Observations of the Extraordinary GRB 221009A Reveal an Ordinary Supernova Without Signs of $r$-Process Enrichment in a Low-Metallicity Galaxy
JWST Observations of the Extraordinary GRB 221009A Reveal an Ordinary Supernova Without Signs of $r$-Process Enrichment in a Low-Metallicity Galaxy Open
Identifying the astrophysical sites of the $r$-process, one of the primary mechanisms by which heavy elements are formed, is a key goal of modern astrophysics. The discovery of the brightest gamma-ray burst of all time, GRB 221009A, at a r…
View article: Hours-long Near-UV/Optical Emission from Mildly Relativistic Outflows in Black Hole–Neutron Star Mergers
Hours-long Near-UV/Optical Emission from Mildly Relativistic Outflows in Black Hole–Neutron Star Mergers Open
The ongoing LIGO–Virgo–KAGRA observing run O4 provides an opportunity to discover new multimessenger events, including binary neutron star (BNS) mergers such as GW170817 and the highly anticipated first detection of a multimessenger black …
View article: Hours-long Near-UV/Optical Emission from Mildly Relativistic Outflows in Black Hole-Neutron Star Mergers
Hours-long Near-UV/Optical Emission from Mildly Relativistic Outflows in Black Hole-Neutron Star Mergers Open
The ongoing LIGO-Virgo-KAGRA observing run O4 provides an opportunity to discover new multi-messenger events, including binary neutron star (BNS) mergers such as GW170817, and the highly anticipated first detection of a multi-messenger bla…
View article: Large-scale Evolution of Seconds-long Relativistic Jets from Black Hole-Neutron Star Mergers
Large-scale Evolution of Seconds-long Relativistic Jets from Black Hole-Neutron Star Mergers Open
We present the first numerical simulations that track the evolution of a black hole-neutron star (BH-NS) merger from pre-merger to $r\gtrsim10^{11}\,{\rm cm}$. The disk that forms after a merger of mass ratio $q=2$ ejects massive disk wind…
View article: The Landscape of Thermal Transients from Supernova Interacting with a Circumstellar Medium
The Landscape of Thermal Transients from Supernova Interacting with a Circumstellar Medium Open
The interaction of supernova ejecta with a surrounding circumstellar medium (CSM) generates a strong shock which can convert the ejecta kinetic energy into observable radiation. Given the diversity of potential CSM structures (arising from…
View article: StaNdaRT: a repository of standardised test models and outputs for supernova radiative transfer
StaNdaRT: a repository of standardised test models and outputs for supernova radiative transfer Open
We present the first results of a comprehensive supernova (SN) radiative-transfer (RT) code-comparison initiative (StaNdaRT), where the emission from the same set of standardised test models is simulated by currently used RT codes. We ran …
View article: StaNdaRT: A repository of standardized test models and outputs for supernova radiative transfer
StaNdaRT: A repository of standardized test models and outputs for supernova radiative transfer Open
We present the first results of a comprehensive supernova (SN) radiative-transfer (RT) code-comparison initiative (StaNdaRT), where the emission from the same set of standardized test models is simulated by currently-used RT codes. A total…
View article: StaNdaRT: A repository of standardized test models and outputs for supernova radiative transfer
StaNdaRT: A repository of standardized test models and outputs for supernova radiative transfer Open
We present the first results of a comprehensive supernova (SN) radiative-transfer (RT) code-comparison initiative (StaNdaRT), where the emission from the same set of standardized test models is simulated by currently-used RT codes. A total…
View article: 3D Hydrodynamics of Pre-supernova Outbursts in Convective Red Supergiant Envelopes
3D Hydrodynamics of Pre-supernova Outbursts in Convective Red Supergiant Envelopes Open
Eruptive mass loss likely produces the energetic outbursts observed from some massive stars before they become core-collapse supernovae (SNe). The resulting dense circumstellar medium may also cause the subsequent SNe to be observed as Typ…
View article: 3D Hydrodynamics of Pre-supernova Outbursts in Convective Red Supergiant Envelopes
3D Hydrodynamics of Pre-supernova Outbursts in Convective Red Supergiant Envelopes Open
Eruptive mass loss likely produces the energetic outbursts observed from some massive stars before they undergo core-collapse supernovae (CCSNe). The resulting dense circumstellar medium (CSM) may also cause the subsequent SNe to be observ…
View article: 3D Hydrodynamics of Pre-supernova Outbursts in Convective Red Supergiant Envelopes
3D Hydrodynamics of Pre-supernova Outbursts in Convective Red Supergiant Envelopes Open
MESA model file containing the stellar profiles used as the initial conditions of the 3D convective equilibrium model in the paper "3D Hydrodynamics of Pre-supernova Outbursts in Convective Red Supergiant Envelopes".