Venerdì 24 gennaio alle ore 15:00, la Dott.ssa Anamaria Gkini, dottoranda presso la Stockholm University, Dipartimento di Astronomia (Svezia), terrà il seminario dal titolo “Chasing eruptive mass loss prior to superluminous supernovae“.

Abstract
The fate of stars and the type of the resulting supernova (SN) are closely linked to their final years before core collapse. During the late stages of stellar evolution, stars can lose a significant amount of their initial mass through eruptive mass loss, leading to the formation of circumstellar material (CSM) around the SN. The existence of CSM can be shown up in the spectra of SNe in the form of resonance lines in the near-ultraviolet. In this talk, I will focus on an exceptionally bright class of SNe known as superluminous supernovae (SLSNe). In particular, I will present two SLSNe that show spectroscopic evidence of CSM, ejected shortly before the explosion. I will focus on the modeling of the spectroscopic lines to infer the properties of the CSM and the timing of ejection. Finally, I will discuss potential mass-loss mechanisms and sources that power these SLSNe. The discovery of these objects offers valuable insight into the late stages of stellar evolution and enhances our understanding of SLSN progenitors.