A5015602489- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Calibration and Measurement Techniques
- Laser-Plasma Interactions and Diagnostics
Stockholm University
2024
AlbaNova
2024
Leiden University
2021-2023
Leiden Observatory
2021
Abstract Multipeaked supernovae with precursors, dramatic light-curve rebrightenings, and spectral transformation are rare, but being discovered in increasing numbers by modern night-sky transient surveys like the Zwicky Transient Facility. Here, we present observations analysis of SN 2023aew, which showed a increase brightness following an initial luminous (−17.4 mag) long (∼100 days) unusual first peak (possibly precursor). 2023aew was classified as Type IIb supernova during changed its...
Abstract We present supernova (SN) 2023ufx, a unique Type IIP SN with the shortest known plateau duration ( t PT ∼ 47 days), luminous V -band peak M = −18.42 ± 0.08 mag), and rapid early decline rate s 1 3.47 0.09 mag (50 days) −1 ). By comparing observed photometry to hydrodynamic MESA+STELLA model grid, we constrain progenitor be massive red supergiant ZAMS 19–25 ⊙ . Independent comparisons nebular spectral models also suggest an initial He-core mass of ∼6 , thus progenitor. For IIP,...
Over the past two decades, an increasing number of transients have shown luminous activity at their explosion sites weeks to years before interacting supernova (SN) is observed. For some objects, this pre-SN typically linked large-scale mass-loss events preceding core collapse, yet its triggering mechanism and underlying process remain uncertain. We present SN 2022mop, which was initially observed in August 2022, exhibiting nebular emission, including [O I], Mg [Ca II], resembling late-time...
Multi-peaked supernovae with precursors, dramatic light-curve rebrightenings, and spectral transformation are rare, but being discovered in increasing numbers by modern night-sky transient surveys like the Zwicky Transient Facility (ZTF). Here, we present observations analysis of SN 2023aew, which showed a increase brightness following an initial luminous (-17.4 mag) long (~100 days) unusual first peak (possibly precursor). 2023aew was classified as Type IIb supernova during changed its type...
Nitrogen is produced by CNO-cycling in massive stars, and can be ejected significant amounts supernova explosions. While H-rich SNe, its [\ion{N}{II}] 6548, 6583 emission becomes obscured strong H$\alpha$, explosions of He this nitrogen more visible. We here explore the formation line, using \texttt{SUMO} code to compute spectra for a grid 1D models with parameterized mixing informed from new 2D simulations. Because mass fraction ejecta decreases larger core masses, as He/N zone gets...
ABSTRACT Nitrogen is produced by CNO-cycling in massive stars, and can be ejected significant amounts supernova explosions. While H-rich SNe, its [N ii] 6548, 6583 emission becomes obscured strong H$\alpha$, explosions of He this nitrogen more visible. We here explore the formation line, using sumo code to compute spectra for a grid 1D models with parametrized mixing informed from new 2D simulations. Because mass fraction ejecta decreases larger He-core masses, as He/N zone gets processed...
A key unknown of the Milky Way (MW) satellites is their orbital history, and, in particular, time they were accreted onto MW system since it marks point where experience a multitude environmental processes. We present new methodology for determining infall times, namely using neural network (NN) algorithm. The NN trained on MW-analogues EAGLE hydrodynamical simulation to predict if dwarf galaxy at first or backsplash and infer its time. resulting predicts with 85\% accuracy currently outside...
We present supernova (SN) 2023ufx, a unique Type IIP SN with the shortest known plateau duration ($t_\mathrm{PT}$ $\sim$47 days), luminous V-band peak ($M_{V}$ = $-$18.42 $\pm$ 0.08 mag), and rapid early decline rate ($s1$ 3.47 0.09 mag (50 days)$^{-1}$). By comparing observed photometry to hydrodynamic MESA+STELLA model grid, we constrain progenitor be massive red supergiant M$_\mathrm{ZAMS}$ $\simeq$19 - 25 M$_{\odot}$. Independent comparisons nebular spectral models also suggest an...
In 2007, the young star 1SWASP J140747.93-394542.6 (V1400 Cen) underwent a complex series of deep eclipses over 56 days. This was attributed to transit ring system filling large fraction Hill sphere an unseen substellar companion. Subsequent photometric monitoring has not found any other transits from this candidate system, but if there are more companions and they coplanar with potential is chance that will as well. active light curves show 5% modulation in amplitude dominant rotation...
A key unknown of the Milky Way (MW) satellites is their orbital history, and, in particular, time they were accreted onto MW system since it marks point where experience a multitude environmental processes. We present new methodology for determining infall times, namely using neural network (NN) algorithm. The NN trained on MW-analogues EAGLE hydrodynamical simulation to predict if dwarf galaxy at first or backsplash and infer its time. resulting predicts with 85\% accuracy currently outside...