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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">Dear all,</span></div>
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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">Our next EO meeting will take place </span><strong style="margin-top: 0pt; margin-bottom: 0pt;" class="">next</strong><span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class=""> </span><strong style="margin-top: 0pt; margin-bottom: 0pt;" class="">Thursday,
18th of November, at 13:15 </strong><span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class=""> </span><strong style="margin-top: 0pt; margin-bottom: 0pt;" class="">(CET)</strong><span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class=""> via
Zoom.</span></div>
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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">To join access: </span><a style="margin-top: 0pt; margin-bottom: 0pt; color: rgb(74, 110, 224);" target="_blank" href="https://stockholmuniversity.zoom.us/j/67378581617" class="editor-rtfLink"><span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">https://stockholmuniversity.zoom.us/j/67378581617</span></a></div>
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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">The speaker is </span><strong style="margin-top: 0pt; margin-bottom: 0pt;" class="">Lorentzo Nativi</strong><span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">.
Most of you should know him, he is a PhD student working with Stephan Rosswog at the OKC. He will tell us about his latest paper:
<a href="https://arxiv.org/pdf/2109.00814.pdf" class="">https://arxiv.org/pdf/2109.00814.pdf</a> </span></div>
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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">Below is the title and abstract of the talk.</span></div>
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<strong style="margin-top: 0pt; margin-bottom: 0pt;" class="">Investigating the jet-ejecta interaction in neutron star mergers</strong></div>
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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">GW170817 represented the first detection of a binary neutron star merger, and the coalescence of the two neutron stars was followed by both the ejection of neutron-rich
material and the launch of a relativistic jet.</span></div>
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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">These two dynamical components, mildly-relativistic ejecta, and ultra-relativistic outflow, were detected independently: the first one powered a "macronova" (or "kilonova"),
a thermal transient produced by the radioactive decay of the freshly synthesized r-process nuclei. The jet instead powered a short GRB consisting of an early gamma-ray signal followed by a multi-wavelength afterglow.</span></div>
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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">The presence of a jet successfully breaking out from the ejecta was additionally confirmed by the detection of superluminal motion.</span></div>
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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">These two components were detected and modelled independently, but they interact before becoming visible, and this might have left an imprint on the detected signals.</span></div>
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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">I will discuss the results of the 3D special-relativistic simulations used to investigate the consequences of a jet propagating through a realistic environment, created
by a neutrino-driven wind around the central remnant.</span></div>
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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">I will show how a jet can "punch-away" a fraction of high-opacity material at early times, before the brightening of the macronova, and how this is going to impact the
observed signal.</span></div>
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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">Then I will show what happens in the other direction i.e., how the ejecta impact the jet. I will show that the emerging jets are mostly shaped by their interaction with
the surrounding environment and their eventual initial structures only plays a minor role (but non negligible) in the final outcome.</span></div>
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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">Hope to see you there!</span></div>
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<span style="margin-top: 0pt; margin-bottom: 0pt;" data-preserver-spaces="true" class="">Ana Sagués Carracedo & Davide Gizzi</span></div>
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