[Drand] ScientiFika 26/04 – Priscila Pessi - 'What makes the dead rise'

[Nikki Arendse]

Dear Juniors, this is a reminder of the ScientiFika today at 16:00 at Nordita. Priscila Pessi will talk about the power mechanisms behind the most luminous supernova explosions.

Place: NORDITA Floor 6 - Fika area (in-person only).
Address: AlbaNova University Center, Hannes Alfvéns väg 12

We hope to see you there!
The ScientiFika team


________________________________
From: scientific-fika.nordita-at-su.se <scientific-fika.nordita-at-su.se-bounces at lists.su.se> on behalf of Nikki Arendse <nikki.arendse at fysik.su.se>
Sent: 22 April 2024 11:34
To: scientific-fika.nordita at su.se; drand at fysik.su.se; student at fysik.su.se
Subject: [Scientific fika] ScientiFika 26/04 – Priscila Pessi - 'What makes the dead rise'


Dear Juniors,

It is my pleasure to announce this week's ScientiFika. Join us on Friday the 26th of April at 16:00 for delicious Swedish pastries and an interesting talk by Priscila Pessi about supernova explosions.


Priscila Pessi


What makes the dead rise
(or, what powers the light curves of the most luminous supernovae?)




Supernovae result from the explosive death of massive stars. If the progenitor star retained at least some of its outermost hydrogen layers before explosion, the spectra of the supernova will show hydrogen lines. These supernovae are classified as Type II. Through the spectral evolution of a Type II supernova, we can infer the structure of the progenitor star. The light curve, produced by the supernova's brightness variation over time, helps us understand the energetics of the explosion. Typical theoretical models propose that Type II supernova light curves are powered by hydrogen recombination and heating from radioactive decay of Nickel-56. However, there exist some atypical Type II supernovae whose spectral and light curve characteristics can not be explained by such a model alone, suggesting the need for alternative power sources.


In this talk I will present Type II supernovae (SNe II) that show atypically bright light curves, classified as  "LSNe II" and "SLSNe II". I will explain why we keep adding letters at the beginning of the SN II name, and I will show which observables can help elucidate the physical mechanism that powers these events.



Place: NORDITA Floor 6 - Fika area (in-person only).
Address: AlbaNova University Center, Hannes Alfvéns väg 12
www.scientifika.se<http://www.scientifika.se/>

We're looking forward to seeing you!
Nadia, Guilherme and Nikki

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