Doron Kushnir
YOU?
Author Swipe
View article: All known Type Ia supernovae models fail to reproduce the observed bolometric luminosity–width correlation
All known Type Ia supernovae models fail to reproduce the observed bolometric luminosity–width correlation Open
Type Ia supernovae (SNe Ia) are widely believed to arise from thermonuclear explosions of white dwarfs (WDs). However, ongoing debate surrounds their progenitor systems and the mechanisms triggering these explosions. Recently, Sharon & Kus…
View article: Strong Near-infrared Emission Following the Long-duration GRB 211211A: Dust Heating as an Alternative to a Kilonova
Strong Near-infrared Emission Following the Long-duration GRB 211211A: Dust Heating as an Alternative to a Kilonova Open
The prolonged near-infrared (NIR) emission observed following the long-duration GRB 211211A is inconsistent with afterglow emission from the shock being driven into the circumstellar medium (CSM) as well as with emission from a possible un…
View article: A Cepheid systematics-reduced test of <i>H</i>0 to ≲2.5% accuracy using SH0ES photometry
A Cepheid systematics-reduced test of <i>H</i>0 to ≲2.5% accuracy using SH0ES photometry Open
The recent SH0ES determination of the Hubble constant, $H_0=73.04\pm 1.04$ km s$^{-1}$ Mpc$^{-1}$, deviates significantly by ${\approx }5\sigma$ from the Planck value, stimulating discussions on cosmological model extensions. To minimize s…
View article: Off-centre ignition of sub-Chandrasekhar white dwarfs does not resolve the tension with the observed <i>t</i>0–<i>M</i>Ni56 relation of type Ia supernovae
Off-centre ignition of sub-Chandrasekhar white dwarfs does not resolve the tension with the observed <i>t</i>0–<i>M</i>Ni56 relation of type Ia supernovae Open
Type Ia supernovae (SNe Ia) are likely the thermonuclear explosions of carbon-oxygen (CO) white-dwarf (WD) stars, but the exact nature of their progenitor systems remains uncertain. Recent studies have suggested that a propagating detonati…
View article: High γ-ray escape time in 2003fg-like supernovae: a challenge to proposed models
High γ-ray escape time in 2003fg-like supernovae: a challenge to proposed models Open
A rare subclass of Type Ia supernovae (SNe Ia), named after the prototype SN 2003fg, includes some of the brightest SNe Ia, often called “super Chandrasekhar-mass” SNe Ia. We calculate the $\gamma$-ray deposition histories and the $^{56}$N…
View article: Off-centre ignition of sub-Chandrasekhar white dwarfs does not resolve the tension with the observed $t_0$-$M_{\rm{Ni}56}$ relation of type Ia supernovae
Off-centre ignition of sub-Chandrasekhar white dwarfs does not resolve the tension with the observed $t_0$-$M_{\rm{Ni}56}$ relation of type Ia supernovae Open
Type Ia supernovae (SNe Ia) are likely the thermonuclear explosions of carbon-oxygen (CO) white-dwarf (WD) stars, but the exact nature of their progenitor systems remains uncertain. Recent studies have suggested that a propagating detonati…
View article: A cosmic formation site of silicon and sulphur revealed by a new type of supernova explosion
A cosmic formation site of silicon and sulphur revealed by a new type of supernova explosion Open
The cores of stars are the cosmic furnaces where light elements are fused into heavier nuclei. The fusion of hydrogen to helium initially powers all stars. The ashes of the fusion reactions are then predicted to serve as fuel in a series o…
View article: High $γ$-ray escape time in 2003fg-like supernovae: A challenge to proposed models
High $γ$-ray escape time in 2003fg-like supernovae: A challenge to proposed models Open
A rare subclass of Type Ia supernovae (SNe Ia), named after the prototype SN 2003fg, includes some of the brightest SNe Ia, often called "super Chandrasekhar-mass" SNe Ia. We calculate the $γ$-ray deposition histories and the $^{56}$Ni mas…
View article: All known Type Ia supernovae models fail to reproduce the observed bolometric luminosity-width correlation
All known Type Ia supernovae models fail to reproduce the observed bolometric luminosity-width correlation Open
Type Ia supernovae (SNe Ia) are widely believed to arise from thermonuclear explosions of white dwarfs (WDs). However, ongoing debate surrounds their progenitor systems and the mechanisms triggering these explosions. Recently, Sharon \& Ku…
View article: A Cepheid systematics-free test of $H_0$ to $\lesssim2.5\%$ accuracy using SH0ES photometry
A Cepheid systematics-free test of $H_0$ to $\lesssim2.5\%$ accuracy using SH0ES photometry Open
The recent SH0ES determination of the Hubble constant, $H_0=73.04\pm1.04$ km/s/Mpc, deviates significantly by $\approx5σ$ from the \textit{Planck} value, stimulating discussions on cosmological model extensions. To minimize statistical unc…
View article: Coma cluster $γ$-ray and radio emission is consistent with a secondary electron origin for the radio halo
Coma cluster $γ$-ray and radio emission is consistent with a secondary electron origin for the radio halo Open
Observations of diffuse, non-thermal radio emission spanning several megaparsecs have been documented in over 100 galaxy clusters. This emission, classified as giant radio halos (GHs), mini halos, and radio relics based mainly on their loc…
View article: Asteroid Collisions: Expected Visibility and Rate
Asteroid Collisions: Expected Visibility and Rate Open
Asteroid collisions are one of the main processes responsible for the evolution of bodies in the main belt. Using observations of the Dimorphos impact by the DART spacecraft, we estimate how asteroid collisions in the main belt may look in…
View article: The complex circumstellar environment of supernova 2023ixf
The complex circumstellar environment of supernova 2023ixf Open
The early evolution of a supernova (SN) can reveal information about the environment and the progenitor star. When a star explodes in vacuum, the first photons to escape from its surface appear as a brief, hours-long shock-breakout flare1,…
View article: Asteroid collisions: expected visibility and rate
Asteroid collisions: expected visibility and rate Open
Asteroid collisions are one of the main processes responsible for the evolution of bodies in the main belt. Using observations of the Dimorphos impact by the DART spacecraft, we estimate how asteroid collisions in the main belt may look in…
View article: ULTRASAT: A Wide-field Time-domain UV Space Telescope
ULTRASAT: A Wide-field Time-domain UV Space Telescope Open
The Ultraviolet Transient Astronomy Satellite (ULTRASAT) is scheduled to be launched to geostationary orbit in 2027. It will carry a telescope with an unprecedentedly large field of view (204 deg 2 ) and near-ultraviolet (NUV; 230–290 nm) …
View article: Reassessing the constraints from SH0ES extragalactic Cepheid amplitudes on systematic blending bias
Reassessing the constraints from SH0ES extragalactic Cepheid amplitudes on systematic blending bias Open
The SH0ES collaboration Hubble constant determination is in a ∼5σ difference with the Planck value, known as the Hubble tension. The accuracy of the Hubble constant measured with extragalactic Cepheids depends on robust stellar-crowding ba…
View article: UV to near-IR observations of the DART-Dimorphos collision
UV to near-IR observations of the DART-Dimorphos collision Open
The impact of the Double Asteroid Redirection Test (DART) spacecraft with Dimorphos allows us to study asteroid collision physics, including momentum transfer, the ejecta properties, and the visibility of such events in the Solar system. W…
View article: UV to near-IR observations of the DART-Dimorphos collision
UV to near-IR observations of the DART-Dimorphos collision Open
The impact of the Double Asteroid Redirection Test (DART) spacecraft with Dimorphos allows us to study asteroid collision physics, including momentum transfer, the ejecta properties, and the visibility of such events in the Solar System. W…
View article: Photometric prioritization of neutron star merger candidates
Photometric prioritization of neutron star merger candidates Open
Rapid identification of the optical counterparts of neutron star (NS) merger events discovered by gravitational wave detectors may require observing a large error region and sifting through a large number of transients to identify the obje…
View article: Photometric prioritization of neutron star merger candidates
Photometric prioritization of neutron star merger candidates Open
Rapid identification of the optical counterparts of Neutron Star (NS) merger events discovered by gravitational wave detectors may require observing a large error region and sifting through a large number of transients to identify the obje…
View article: A 12.4 day periodicity in a close binary system after a supernova
A 12.4 day periodicity in a close binary system after a supernova Open
Neutron stars and stellar-mass black holes are the remnants of massive star explosions. Most massive stars reside in close binary systems, and the interplay between the companion star and the newly formed compact object has been theoretica…
View article: The Large Array Survey Telescope—System Overview and Performances
The Large Array Survey Telescope—System Overview and Performances Open
The Large Array Survey Telescope (LAST) is a wide-field visible-light telescope array designed to explore the variable and transient sky with a high cadence. LAST will be composed of 48, 28 cm f/2.2 telescopes (32 already installed) equipp…
View article: Reassessing the Constraints from SH0ES Extragalactic Cepheid Amplitudes on Systematic Blending Bias
Reassessing the Constraints from SH0ES Extragalactic Cepheid Amplitudes on Systematic Blending Bias Open
The SH0ES collaboration Hubble constant determination is in a ${\sim}5σ$ difference with the $Planck$ value, known as the Hubble tension. The accuracy of the Hubble constant measured with extragalactic Cepheids depends on robust stellar-cr…
View article: Observational characterization of the ejecta from the DART-Dimorphos impact
Observational characterization of the ejecta from the DART-Dimorphos impact Open
The Double Asteroid Redirection Test1,2 (DART) was intended to test planetary defense strategies via the reaction of the near-Earth asteroid Dimorphos, a satellite of Didymous, to a spacecraft impact. Pre-impact modeling3–7 predicted a mom…
View article: The $γ$-ray deposition histories of Calcium-rich supernovae
The $γ$-ray deposition histories of Calcium-rich supernovae Open
Calcium-rich supernovae (Ca-rich SNe) are faint, rapidly evolving transients whose progenitor system is yet to be determined. We derive the $γ$-ray deposition histories of five Ca-rich SNe from the literature in order to place constraints …
View article: Confronting double-detonation sub-Chandrasekhar models with the low-luminosity suppression of Type Ia supernovae
Confronting double-detonation sub-Chandrasekhar models with the low-luminosity suppression of Type Ia supernovae Open
Type Ia supernovae (SNe Ia) are likely the thermonuclear explosions of carbon–oxygen (CO) white-dwarf (WD) stars, but their progenitor systems remain elusive. Recently, Sharon & Kushnir used The Zwicky Transient Facility Bright Transient S…
View article: Strong NIR emission following the long duration GRB 211211A: Dust heating as an alternative to a kilonova
Strong NIR emission following the long duration GRB 211211A: Dust heating as an alternative to a kilonova Open
The prolonged near infrared (NIR) emission observed following the long duration GRB 211211A is inconsistent with afterglow emission from the shock driven into the circum-stellar medium (CSM), and with emission from a possible underlying su…
View article: AT 2018lqh and the Nature of the Emerging Population of Day-scale Duration Optical Transients
AT 2018lqh and the Nature of the Emerging Population of Day-scale Duration Optical Transients Open
We report on the discovery of AT 2018lqh (ZTF 18abfzgpl)—a rapidly evolving extragalactic transient in a star-forming host at 242 Mpc. The transient g -band light curve’s duration above a half-maximum light is about 2.1 days, where 0.4/1.7…
View article: The ZTF-BTS Type Ia supernovae luminosity function is consistent with a single progenitor channel for the explosions
The ZTF-BTS Type Ia supernovae luminosity function is consistent with a single progenitor channel for the explosions Open
We construct the Type Ia supernovae (SNe Ia) luminosity function (LF) using the Zwicky Transient Facility Bright Transient Survey (BTS) catalogue. While this magnitude-limited survey has an unprecedented number of objects, it suffers from …