57 citations · 205 across the 14 of their papers we have counts for
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SN 2023rve: A Type II Supernova with No Nebular Oxygen
Melissa Rosowsky, Stefano Valenti, Aravind P. Ravi +21
We report on multiband photometric and spectroscopic observations of SN 2023rve, a nearby Type II supernova (SN II) discovered in galaxy NGC 1097 (D=15.4 3.2 Mpc). Nearby SNe…
NLTE Spectral Modelling of the Nearby Stripped-Envelope Supernova 2024ehs
Wilmer Sand Hellman, Seán J. Brennan, Stan Bartmentloo +7
We present a detailed study of the Type IIb supernova 2024ehs, discovered in March 2024 in the nearby galaxy NGC 3443 at a distance of Mpc. Using photometric and spec…
JWST observations of SN 2024abup: First Detection of CO in a broad-lined Type Ic Supernova and Constraints on r-process Nucleosynthesis
Manisha Shrestha, Lindsey A. Kwok, David J. Sand +42
SN 2024abup is a nearby broad-lined Type Ic supernova (SN Ic-bl) in NGC 0681 at a distance of 23.3 \pm 1.6 Mpc. As energetic explosions of massive stars, SNe Ic-bl are considered a…
Recombination Rates for Uranium Ions Using the Analogous Nd III as a Guideline and Their Effect on Kilonova Nebular SpectraAn Exploration of Recombination of Uranium with application to Kilonovae Spectra
Niamh Ferguson, Anders Jerkstrand, Smaranika Banerjee +2
Dielectronic recombination (DR) is expected to be the dominant recombination process during the non-local thermodynamic equilibrium (non-LTE) phase of kilonovae, yet reliable DR da…
Spectral synthesis techniques for supernovae and kilonovae
Anders Jerkstrand
Supernovae (SNe) and kilonovae (KNe) are the most violent explosions in cosmos, signalling the destruction of a massive star (core-collapse SN), a white dwarf (thermonuclear SN) an…
ExTraSS: a Domain Decomposed 3D NLTE Radiative Transfer spectral synthesis code for nebular phase transients
Bart F. A. van Baal, Anders Jerkstrand
In the nebular phase, supernovae are powered by radioactive decay and continuously fade, while their densities have decreased enough such that the expanding nebula becomes (largely…
Lanthanide Impact on the Infra-Red Spectra of Nebular Phase Kilonovae
Quentin Pognan, Kyohei Kawaguchi, Shinya Wanajo +3
Nebular phase kilonovae (KNe) have significant infra-red (IR) emission thought to be mostly forbidden emission lines from rapid neutron capture (r-process) species in neutron star…
Nebular spectra of kilonovae with detailed recombination rates -- I. Light r-process composition
Smaranika Banerjee, Anders Jerkstrand, Nigel Badnell +3
To investigate spectra of kilonovae in the NLTE phase (t>= 1 week), we perform atomic calculations for dielectronic recombination (DR) rates for the light r-process elements Se (Z…
Actinide signatures in low electron fraction kilonova ejecta
Quentin Pognan, Meng-Ru Wu, Gabriel Martínez-Pinedo +4
Neutron star (NS) mergers are known to produce heavy elements through rapid neutron capture (r-process) nucleosynthesis. Actinides are expected to be created solely by the r-proces…
NLTE Spectra of Kilonovae
Quentin Pognan, Jon Grumer, Anders Jerkstrand +1
The electromagnetic transient following a binary neutron star merger is known as a kilonova (KN). Owing to rapid expansion velocities and small ejecta masses, KNe rapidly transitio…
NLTE Effects on Kilonova Expansion Opacities
Quentin Pognan, Anders Jerkstrand, Jon Grumer
A binary neutron star merger produces a rapidly evolving transient known as a kilonova (KN), which peaks a few days after merger. Modelling of KNe has often been approached assumin…
On the Validity of Steady-State for Nebular Phase Kilonovae
Quentin Pognan, Anders Jerkstrand, Jon Grumer
The radioactively powered transient following a binary neutron star (BNS) merger, known as a kilonova (KN), is expected to enter the steady-state nebular phase a few days after mer…