97 citations · 809 across the 38 of their papers we have counts for
38 papers
Observational signatures of thermonuclear electron-capture supernovae -- Ne II line strengthening and color evolution as traces of the explosion mechanism
Alexander Holas, Fionntan P. Callan, Samuel W. Jones +7
Thermonuclear electron-capture supernovae (tECSNe) are a potential fate of certain intermediate mass stars forming ONe cores at the end of their evolution. Simulations suggest that…
Helium superluminous SN 2021bnw : an explosion of a massive star with a pre-outburst
Alexandra Kozyreva, Matteo Bugli, Alexey Mironov +1
Superluminous supernovae (SLSNe) remain an intriguing topic in supernova (SN) transient astronomy. While the majority of SLSNe are shown to be explained by energy streaming from th…
The nearby He-rich superluminous supernova SN 2021bnw during photospheric phases
A. Fiore, A. Kozyreva, L. Yan +40
Aim. We present and interpret the data of the nearby hydrogen-deficient but helium-rich superluminous supernova SN 2021bnw which reached a magnitude of -20.7 at maximum luminosity…
SN 2023ixf -- an average-energy explosion with circumstellar medium and a precursor
Alexandra Kozyreva, Andrea Caputo, Petr Baklanov +2
Abridged: The fortunate proximity of the SN2023ixf allowed astronomers to follow its evolution from almost the moment of the collapse of the progenitor's core. SN2023ixf can be exp…
Primary and secondary source of energy in the superluminous supernova 2018ibb
Alexandra Kozyreva, Luke Shingles, Petr Baklanov +2
We examine the pair-instability origin of superluminous supernova 2018ibb. As the base model, we use a non-rotating stellar model with an initial mass of 250 Msun at about 1/15 sol…
SN 2020pvb: a Type IIn-P supernova with a precursor outburst
Nancy Elias-Rosa, Seán J. Brennan, Stefano Benetti +37
We present photometric and spectroscopic data sets for SN 2020pvb, a Type IIn-P supernova (SN) similar to SNe 1994W, 2005cl, 2009kn and 2011ht, with a precursor outburst detected (…
Thermonuclear explosions as Type II supernovae
Alexandra Kozyreva, Javier Moran-Fraile, Alexander Holas +5
We consider a binary stellar system, in which a low-mass, of 0.6 Msun, carbon-oxygen white dwarf (WD) mergers with a degenerate helium core of 0.4 Msun of a red giant. We analyse t…
Unprecedented early flux excess in the hybrid 02es-like type Ia supernova 2022ywc indicates interaction with circumstellar material
Shubham Srivastav, T. Moore, M. Nicholl +20
We present optical photometric and spectroscopic observations of the 02es-like type Ia supernova (SN) 2022ywc. The transient occurred in the outskirts of an elliptical host galaxy…
SN 2021gno: a Calcium-rich transient with double-peaked light curves
K. Ertini, G. Folatelli, L. Martinez +52
We present extensive ultraviolet (UV) and optical photometric and optical spectroscopic follow-up of supernova (SN)~2021gno by the "Precision Observations of Infant Supernova Explo…
1100 days in the life of the supernova 2018ibb -- The best pair-instability supernova candidate, to date
Steve Schulze, Claes Fransson, Alexandra Kozyreva +63
Abridged - Stars with ZAMS masses between 140 and are thought to explode as pair-instability supernovae (PISNe). During their thermonuclear runaway, PISNe can produce…
The impact of effective matter mixing based on three-dimensional hydrodynamical models on the molecule formation in the ejecta of SN 1987A
Masaomi Ono, Takaya Nozawa, Shigehiro Nagataki +4
To investigate the impact of matter mixing on the formation of molecules in the ejecta of SN 1987A, time-dependent rate equations for chemical reactions are solved for one-zone and…
SN 2021zny: an early flux excess combined with late-time oxygen emission suggests a double white dwarf merger event
Georgios Dimitriadis, Kate Maguire, Viraj R. Karambelkar +28
We present a photometric and spectroscopic analysis of the ultra-luminous and slowly evolving 03fg-like Type Ia SN 2021zny. Our observational campaign starts from hours a…
Formation of star clusters and enrichment by massive stars in simulations of low-metallicity galaxies with a fully sampled initial stellar mass function
Natalia Lahén, Thorsten Naab, Guinevere Kauffmann +6
We present new GRIFFIN project hydrodynamical simulations that model the formation of galactic star cluster populations in low-metallicity () dwarf galaxies, including r…
StaNdaRT: A repository of standardized test models and outputs for supernova radiative transfer
Stéphane Blondin, Sergei Blinnikov, Fionntan P. Callan +26
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 t…
The circumstellar material around the Type IIP SN 2021yja
Alexandra Kozyreva, Jakub Klencki, Alexei V. Filippenko +4
The majority of Type II-plateau supernovae (SNe IIP) have light curves that are not compatible with the explosions of stars in a vacuum; instead, the light curves require the proge…
Weak Mass Loss from the Red Supergiant Progenitor of the Type II SN 2021yja
Griffin Hosseinzadeh, Charles D. Kilpatrick, Yize Dong +56
We present high-cadence optical, ultraviolet (UV), and near-infrared data of the nearby ( Mpc) Type II supernova (SN) 2021yja. Many Type II SNe show signs of interactio…
Low-luminosity type IIP supernovae: SN 2005cs and SN 2020cxd as very low-energy iron core-collapse explosions
Alexandra Kozyreva, Hans-Thomas Janka, Daniel Kresse +2
SN 2020cxd is a representative of the family of low-energy, underluminous Type IIP supernovae (SNe), whose observations and analysis were recently reported by Yang et al. (2021). H…
Close, bright and boxy: the superluminous SN 2018hti
A. Fiore, S. Benetti, M. Nicholl +37
SN 2018hti was a very nearby (z=0.0614) superluminous supernova with an exceedingly bright absolute magnitude of -21.7 mag in r-band at maximum. The densely sampled pre-maximum lig…
Transitional events in the spectrophotometric regime between stripped envelope and superluminous supernovae
S. J. Prentice, C. Inserra, S. Schulze +24
The division between stripped-envelope supernovae (SE-SNe) and superluminous supernovae (SLSNe) is not well defined in either photometric or spectroscopic space. While a sharp lumi…
SN 2019hcc: A Type II Supernova Displaying Early O II Lines
Eleonora Parrag, Cosimo Inserra, Steve Schulze +18
We present optical spectroscopy together with ultraviolet, optical and near-infrared photometry of SN 2019hcc, which resides in a host galaxy at redshift 0.044, displaying a sub-so…
Synthetic observables for electron-capture supernovae and low-mass core collapse supernovae
Alexandra Kozyreva, Petr Baklanov, Samuel Jones +2
Stars in the mass range from 8 to 10 solar masses are expected to produce one of two types of supernovae (SNe), either electron-capture supernovae (ECSNe) or core-collapse supernov…
The influence of line opacity treatment in STELLA on supernova light curves
Alexandra Kozyreva, Luke Shingles, Alexey Mironov +2
We systematically explore the effect of the treatment of line opacity on supernova light curves. We find that it is important to consider line opacity for both scattering and absor…
The low-luminosity type II SN\,2016aqf: A well-monitored spectral evolution of the Ni/Fe abundance ratio
Tomás E. Müller-Bravo, Claudia P. Gutiérrez, Mark Sullivan +20
Low-luminosity type II supernovae (LL SNe~II) make up the low explosion energy end of core-collapse SNe, but their study and physical understanding remain limited. We present SN\,2…
Shock breakouts from red supergiants: analytical and numerical predictions
Alexandra Kozyreva, Ehud Nakar, Roni Waldman +2
Shock breakout (SBO) signal is the first signature of the supernova explosion apart from gravitational waves and neutrinos. Observational properties of SBO, such as bolometric lumi…