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<font face="Calibri,Helvetica,sans-serif,serif,EmojiFont" size="2"><span style="font-size: 16px;"><font face="Helvetica,Arial,sans-serif,serif,EmojiFont" size="3" color="black"><span style="font-size: 12pt;">Dear Juniors,</span></font></span></font></div>
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<font face="Calibri,Helvetica,sans-serif,serif,EmojiFont" size="2"><span style="font-size: 16px;"><font face="Helvetica,Arial,sans-serif,serif,EmojiFont" size="2"><span style="font-size: 16px;">It is my pleasure to announce this week's ScientiFika. Join us</span></font><font face="Helvetica,Arial,sans-serif,serif,EmojiFont" size="3"><span style="font-size: 12pt;"> on
Friday</span></font><font face="Helvetica,Arial,sans-serif,serif,EmojiFont" size="3"><span style="font-size: 12pt;"><b> the 26</b></span></font><font face="Helvetica,Arial,sans-serif,serif,EmojiFont" size="-1"><b><sup>th</sup></b></font><font face="Helvetica,Arial,sans-serif,serif,EmojiFont" size="3"><span style="font-size: 12pt;"><b> of
April at 16:00</b></span></font><font face="Helvetica,Arial,sans-serif,serif,EmojiFont" size="3"><span style="font-size: 12pt;"> for delicious Swedish pastries and an interesting talk by</span></font><font face="Helvetica,Arial,sans-serif,serif,EmojiFont" size="3" color="black"><span style="font-size: 12pt;"> </span></font><font face="Helvetica,Arial,sans-serif,serif,EmojiFont" size="2" color="black"><span style="font-size: 16px;">Priscila
Pessi about supernova explosions.</span></font></span></font></div>
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<font face="Calibri,Helvetica,sans-serif,serif,EmojiFont" size="2"><span style="font-size: 16px;"><font face="Helvetica,Arial,sans-serif,serif,EmojiFont" size="3" color="black"><span id="docs-internal-guid-9c1a4d37-7fff-087d-a11d-2229acd10535" style="font-size: 12pt;"><span style="font-family: Helvetica, Arial, sans-serif, serif, EmojiFont; font-size: 16px;">Priscila
Pessi</span></span></font></span></font></div>
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What makes the dead rise <br>
<span style="font-size: 12pt;">(or, what powers the light curves of the most luminous supernovae?)</span></p>
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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.</p>
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In this talk I will present Type II supernovae (<b>SNe II</b>) that show atypically bright light curves, classified as "<b>L</b>SNe II" and "<b>SL</b>SNe 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.</p>
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<font face="Calibri,Helvetica,sans-serif,serif,EmojiFont" size="2"><span style="font-size: 16px;"><font size="3" color="black" style="font-family: Helvetica, Arial, sans-serif, serif, EmojiFont;"><span style="font-size: 12pt;">Place: NORDITA Floor 6 - Fika
area (in-person only).</span></font></span></font></div>
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<font face="Calibri,Helvetica,sans-serif,serif,EmojiFont" size="2"><span style="font-size: 16px;"><font size="3" color="black" style="font-family: Helvetica, Arial, sans-serif, serif, EmojiFont;"><span style="font-size: 12pt;">Add</span></font><font size="3" color="black" style="font-family: Helvetica, Arial, sans-serif, serif, EmojiFont;"><span style="font-size: 12pt;">ress:
AlbaNova Uni</span></font><font size="3" color="black" style="font-family: Helvetica, Arial, sans-serif, serif, EmojiFont;"><span style="font-size: 12pt;">versity Center, Hannes Alfvéns väg 12</span></font></span></font></div>
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<font face="Calibri,Helvetica,sans-serif,serif,EmojiFont" size="2"><span style="font-size: 16px;"><font size="3" color="black" style="font-family: Helvetica, Arial, sans-serif, serif, EmojiFont;"><span style="font-size: 12pt;">We're looking forward to seeing
you!</span></font><font face="Helvetica,Arial,sans-serif,serif,EmojiFont" size="2" color="#212121"><span style="font-size: 16px;"><br>
</span></font><font size="3" color="black" style="font-family: Helvetica, Arial, sans-serif, serif, EmojiFont;"><span style="font-size: 12pt;">Nadia, Guilherme and Nikki</span></font></span></font></div>
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