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<div id="magicdomid832" style="padding-right:1px"><font size="1" style="font-family:Arial,sans-serif,serif,EmojiFont"><span id="magicdomid832" style="font-size:11pt">Dear colleagues,</span></font></div>
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<div id="magicdomid883" style="padding-right:1px"><font size="1" style="font-family:Arial,sans-serif,serif,EmojiFont"><span id="magicdomid883" style="font-size:13px"><span style="font-size:11pt">our next EO meeting will take place next </span><b><span style="font-size:11pt">Thursday,
7th of October, at 13:15 (CEST)</span></b><span style="font-size:11pt"> via Zoom.</span></span></font></div>
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<div id="magicdomid884" style="padding-right:1px"><font size="1" style="font-family:Arial,sans-serif,serif,EmojiFont"><span id="magicdomid884" style="font-size:13px"><span style="font-size:11pt">To join access: </span><span id="LPlnk165713"><a href="https://stockholmuniversity.zoom.us/j/67378581617" target="_blank" rel="noopener noreferrer" id="LPlnk165713" previewremoved="true"><span style="font-size:11pt">https://stockholmuniversity.zoom.us/j/67378581617</span></a></span></span></font></div>
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<div id="magicdomid884" style="padding-right:1px"><font size="1" style="font-family:Arial,sans-serif,serif,EmojiFont"><span style="font-size:11pt">The speaker is </span></font><b style="font-family:Arial,sans-serif,serif,EmojiFont; font-size:13px"><span style="font-size:11pt">Tamar
Faran</span></b><span style="font-family:Arial,sans-serif,serif,EmojiFont; font-size:11pt">, a </span><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:11pt">final year
Ph.D. student at the Hebrew University of Jerusalem </span><span style="caret-color: rgb(33, 33, 33); color: rgb(33, 33, 33); font-family: wf_segoe-ui_normal, "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif, serif, EmojiFont; font-size: 14.666666984558105px;">under
the supervision of Prof. Re'em Sari</span><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: 11pt;">, working on high energy phenomena related to stellar explosions</span><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: 11pt;">.</span></div>
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<div id="magicdomid884" style="padding-right:1px"><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:11pt">Find below title and abstract of the talk.</span></div>
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<span style="font-size:11pt">Title: Shock wave dynamics and breakout in stellar explosions</span></div>
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<span style="font-size:11pt">Abstract:</span><br>
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<span style="font-size:11pt">Shock waves are ubiquitous in high-energy astrophysics. The first electromagnetic signal observed in different types of stellar explosions, such as supernovae and gamma ray bursts, is released upon emergence of a shock wave from
an opaque stellar envelope, enshrouding a central source. The breakout is followed by expansion of the envelope and the release of energy that was deposited there by the shock wave. The escaping radiation shortly after breakout carries direct information on
the properties of the progenitors, their surroundings and the explosion, which can be uncovered by confronting observations with analytic models.</span><br>
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<span style="font-size:11pt">In this talk I will first present our model for the early phase radiation following a Newtonian shock breakout in core-collapse supernovae. Through a self similar description of the radiation, we deduce a faster evolving and significantly
lower radiation temperature than predicted by previous models. Moving on to the relativistic regime, I will discuss a hydrodynamic solution for the interiors of a spherical ultra-relativistic blast wave. I will end with relativistic shock breakout, where the
creation of electron-positron pairs play an important role in regulating the photon temperature. I will highlight applications of this work to low luminosity gamma ray bursts and gamma ray emission in neutron star mergers.</span></div>
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<span style="font-size:11pt">Hope to s</span><span style="font-size:11pt">ee you there!</span></div>
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<span style="font-size:11pt">Ana Sagués Carracedo & Davide Gizzi</span></div>
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