9 papers
The ambiguous AT2022rze: Changing-look AGN mimicking a supernova in a merging galaxy system
P. J. Pessi, R. Lunnan, J. Sollerman +36
AT2022rze is a luminous, ambiguous transient located South-East of the geometric center of its host galaxy at redshift z = 0.08. The host appears to be formed by a merging galaxy s…
SN 2023gpw: exploring the diversity and power sources of hydrogen-rich superluminous supernovae
Tuomas Kangas, Panos Charalampopoulos, Takashi Nagao +18
We present our observations and analysis of SN 2023gpw, a hydrogen-rich superluminous supernova (SLSN II) with broad emission lines in its post-peak spectra. Unlike previously obse…
The power of binaries on stripped-envelope supernovae across metallicity: uniform progenitor parameter space and persistently low ejecta masses, but subtype diversity
D. Souropanis, E. Zapartas, T. Pessi +9
Stripped-envelope supernovae (SESNe) originate from massive stars that lose their envelopes through binary interactions or stellar winds. The connection between SESN subtypes and t…
SN2022jli modeled with a Ni double-layer and a magnetar
Mariana Orellana, Melina C. Bersten, Claudia P. Gutiérrez
We study the bolometric evolution of the exceptional Type Ic Supernova (SN) 2022jli, aiming to understand the underlying mechanisms responsible for its distinctive double-peaked li…
Statistical Analysis of Early Spectra in Type II and IIb Supernovae
Maider González-Bañuelos, Claudia P. Gutiérrez, LluÃs Galbany +1
We present a comprehensive analysis of the early spectra of type II and type IIb supernovae (SNe) to explore their diversity and distinguishable characteristics. Using 866 publicly…
Infrared observations reveal the reprocessing envelope in the tidal disruption event AT 2019azh
Thomas M. Reynolds, Lars Thomsen, Seppo Mattila +14
Tidal disruption events (TDEs) are expected to release much of their energy in the far-ultraviolet (UV), which we do not observe directly. However, infrared (IR) observations can o…