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<p><span style="color:rgb(33,33,33); font-family:Calibri,Helvetica,sans-serif; font-size:12pt">Dear colleagues,</span><br>
<font color="#212121" face="wf_segoe-ui_normal, Segoe UI, Segoe WP, Tahoma, Arial, sans-serif, serif, EmojiFont" size="2"><span style=""><br>
</span></font><span style="color:rgb(33,33,33); font-size:12pt; font-family:Calibri,Helvetica,sans-serif">our next EO meeting will take place
<b>on</b></span><b style="color:rgb(33,33,33); font-family:wf_segoe-ui_normal,"Segoe UI","Segoe WP",Tahoma,Arial,sans-serif,serif,EmojiFont; font-size:13.333333015441895px"><span style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt"> Thursday 2nd of
December, at 13:15 (CET) via Zoom</span></b><span style="color:rgb(33,33,33); font-size:12pt; font-family:Calibri,Helvetica,sans-serif">.</span><br>
<span style="color:rgb(33,33,33); font-family:Calibri,Helvetica,sans-serif; font-size:12pt">To join access: </span><font size="2" style="font-family:Arial,sans-serif,serif,EmojiFont"><span style="font-size:11pt"> </span></font><span id="LPlnk165713" style="font-family:Arial,sans-serif,serif,EmojiFont; font-size:13px"><span id="LPlnk165713"><a href="https://stockholmuniversity.zoom.us/j/67378581617" target="_blank" rel="noopener noreferrer" id="LPlnk165713" previewremoved="true"><font size="2"><span id="LPlnk165713" style="font-size:11pt">https://stockholmuniversity.zoom.us/j/67378581617</span></font></a></span></span><br>
<font color="#212121" face="wf_segoe-ui_normal, Segoe UI, Segoe WP, Tahoma, Arial, sans-serif, serif, EmojiFont" size="2"><span style=""><br>
</span></font><span style="color:rgb(33,33,33); font-family:wf_segoe-ui_normal,"Segoe UI","Segoe WP",Tahoma,Arial,sans-serif,serif,EmojiFont; font-size:13.333333015441895px"><span style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt">The speaker
is </span><b><span style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt">Rachel Bruch</span></b><span style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt">, </span></span><span style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont"><span style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt">PhD
student at the Weizmann Institute of Science in Israel, working with Pr. Avishay Gal-Yam since 2018.</span><span style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt"> The team at Weizmann leads the effort within ZTF to gather supernovae in their
infancy and initiate rapid spectroscopic follow-up. They are also involved in the SOXS collaboration, building the optical part of the spectrograph. </span></span><br>
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<p><font face="Calibri, Helvetica, sans-serif" size="3">Below is title and </font><font face="Calibri, Helvetica, sans-serif">abstract</font><font face="Calibri, Helvetica, sans-serif" size="3"> of the talk.</font></p>
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<font size="2" color="black" style="font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont"><span style="font-size:16px"><b>Flash spectroscopy and the environment of massive stars: what we can learn from the first week of a supernova.</b></span></font></div>
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<font size="2" color="black" style="font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont"><span style="font-size:16px"><i>Flash spectroscopy results from a brief and strong illumination of circumstellar material shortly after the explosion of a massive
star, which induces emission lines of highly ionised species such as He II, N III and C III. These emission lines usually disappear within a few days after explosion, making observations difficult. They are however a unique and reliable marker for probing
the presence of CSM around supernova progenitors. With the advent of modern astronomical surveys (such as ZTF), we looked for supernovae within a <2.5d from explosion and gathered a sample of SN II with such early-time spectroscopy. We measured how common
are flash features, finding that 60% (>30% ay 95% CL) of SN II show flash ionisation features. In this talk, I will review the observational campaign to find flash ionisation features and introduce the new questions arising from this search.</i> </span></font></div>
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<p><font face="Calibri, Helvetica, sans-serif" size="3">Next EO meetings:</font></p>
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<p><font face="Calibri, Helvetica, sans-serif" size="3">9th of December: Smaranika Banerjee, Tohoku University, Japan</font><span style="font-family:wf_segoe-ui_normal,"Segoe UI","Segoe WP",Tahoma,Arial,sans-serif,serif,EmojiFont; font-size:15px"></span></p>
<p><font face="Calibri, Helvetica, sans-serif" size="3">16th of December: Bhaskar Biswas, Stockholm University, Sweden</font></p>
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<p><font face="Calibri, Helvetica, sans-serif" size="3">Hope to see you there!</font></p>
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<p><font face="Calibri, Helvetica, sans-serif" size="3">Ana Sagués Carracedo & Davide Gizzi</font></p>
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