[Okc-wp4] EO seminar Thursday 5th

[Haakon Andresen]

Dear Everyone,


These week's seminar will be given by Priscilla,
we meet on Thursday in A5:1003 at 13:15.


Today, at 10:00 in room FB52, EOer Anamaria will defend her PhD thesis.


Best,
Haakon (on behalf of the organiseres)



Speaker: Priscila Pessi

Title: They Look Like Type II Supernovae — But They Are Not
Abstract:
Massive stars that retain their hydrogen envelopes until the end of their lives can produce hydrogen-rich Type II supernova explosions. However, not all transients that resemble Type II supernovae arise from the same physical processes. Some energetic events can mimic Type II supernovae without being genuine stellar explosions, while others may appear hydrogen-rich based on early classifications but lack hydrogen in their spectra.

In this talk, I will present two illustrative cases. The first is a transient initially classified as a core-collapse supernova that, based on detailed observational analysis, was later identified as nuclear activity in its host galaxy. The second is an ongoing study of a supernova candidate originally classified as Type II, for which no hydrogen features are detected in the spectra. Together, these examples show how misclassification can lead to incorrect inferences about the physical mechanisms powering different transients, and they highlight the limitations of current supernova diagnostics. This work emphasizes the need for robust identification strategies to correctly interpret the physics of transients in the era of large survey data sets.

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