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<div class=""><span style="font-size: 14px;" class="">Dear all,</span></div>
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<div class=""><span style="font-size: 14px;" class="">On Friday March 12 at 10:30, we will have the PhD Seminar, remotely via zoom.</span></div>
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<div class=""><span style="font-size: 14px;" class="">Our speaker is Davide Gizzi from the Stockholm University. </span></div>
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<div class=""><span style="font-size: 14px;" class="">Title: Neutrino-driven winds in binary neutron star mergers</span></div>
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<div class=""><span style="font-size: 14px;" class="">Abstract: Neutrinos are produced in copious amounts in the hot environment of a Binary Neutron Star Merger (BNSM). Although being the main source of cooling, neutrinos get scattered and absorbed while leaking
out the post-merger system because of the large matter densities. If matter in the decoupling region gets enough momentum by neutrino absorption to overcome the gravitational well of the central merger remnant, neutrinos are able to power mass ejection called
neutrino-driven winds. At the same time, neutrino absorption on nucleons affects the ejecta composition by changing the amount of neutrons. Since the neutron richness in the ejecta sets the strength of the r-process nucleosynthesis and the matter opacity,
the macronova signal arising from the decay of the unstable r-process nuclei in the wind carries the signature of weak interactions in mergers as it shines in the optical wavelength band. </span></div>
<div class=""><span style="font-size: 14px;" class="">The detection of the blue macronova following the event GW170817 was a clear observational signature of weak interactions in BNSMs. However, other mass ejection channels beside neutrino-driven winds have
been shown to potentially contribute to this optical counterpart of the macronova. In addition, relativistic jets launched from the central engine and drilling through the ejecta have been shown to impact the macronova signal, complicating our understanding
of the diversity of macronova light curves. Looking forward to future, new macronova detections, it is therefore important to systematically study neutrino-driven wind contribution to macronova light curves for different total masses, mass ratios of the binary
and Equation of States (EoSs), as well as accounting for jet-wind interplays for different jet properties.</span></div>
<div class=""><span style="font-size: 14px;" class="">For this purpose, I am going to talk about the implementation of an inexpensive, efficient approximation to the neutrino transport called Advanced Spectral Leakage (ASL). This scheme can be coupled to Lagrangian
hydrodynamics with the Smoothed-Particle Hydrodynamics (SPH) approach to provide neutrino-driven wind profiles from dynamical simulations of BNSMs. In this way, it will be possible to systematically extract the associated macronova light curves and characterize
their diversity.</span></div>
<div class=""><span style="font-size: 14px;" class=""><br class="">
</span></div>
<div class=""><span style="font-size: 14px;" class=""><a href="https://www.albanova.se/event/davide_gizzi/" class="">https://www.albanova.se/event/davide_gizzi/</a></span></div>
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<div class=""><span style="font-size: 14px;" class="">We will have the colloquium using zoom. You will find the invitation at the end of this email.</span></div>
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<div class=""><span style="font-size: 14px;" class="">Some guidelines:</span></div>
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</span></div>
<div class=""><span style="font-size: 14px;" class="">1) Join the session with your microphone muted.</span></div>
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</span></div>
<div class=""><span style="font-size: 14px;" class="">2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. </span></div>
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</span></div>
<div class=""><span style="font-size: 14px;" class="">3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp.</span></div>
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<div class=""><span style="font-size: 14px;" class="">We hope to see all of you there!</span></div>
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</span></div>
<div class=""><span style="font-size: 14px;" class="">Matthias & Janet</span></div>
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</span></div>
<div class=""><span style="font-size: 14px;" class="">Upcoming events: </span></div>
<div class=""><span style="font-size: 14px;" class="">19/03: Sylvia Plöckinger (Leiden)</span></div>
<div class=""><span style="font-size: 14px;" class="">26/03: Matthew Kenworthy (Leiden)</span></div>
<div class=""><span style="font-size: 14px;" class="">02/04: Good friday</span></div>
<div class=""><span style="font-size: 14px;" class="">===================================================</span></div>
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<div class=""><span style="font-size: 14px;" class="">Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting.</span></div>
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</span></div>
<div class=""><span style="font-size: 14px;" class="">Topic: Astronomy Seminar Davide Gizzi</span></div>
<div class=""><span style="font-size: 14px;" class="">Time: Mar 12, 2021 10:30 AM Stockholm</span></div>
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<div class=""><span style="font-size: 14px;" class="">Join Zoom Meeting</span></div>
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<div class=""><span style="font-size: 14px;" class="">Meeting ID: 654 9946 6134</span></div>
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<div class=""><span style="font-size: 14px;" class="">Meeting ID: 654 9946 6134</span></div>
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