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Author |
|
| Name |
Zegarelli, Angela
angela.zegarelli@astro.ruhr-uni-bochum.de |
| Research field | Astroparticle Physics, Multimessenger astronomy, Neutrino astronomy |
| Career stage | postdoc |
| Home university/institution | Ruhr-Universität Bochum (RUB) |
| Department/Research unit at home university/institution | Physics and Astronomy |
| Chair/Working group at home institution | Anna Franckowiak |
International activity |
|
| Country | Italy |
| Location | Pescara |
| University | 17th Marcel Grossman Meeting, University of Pescara |
| Fund Research School | Int.Mo.P |
| Type of activity | conference visit |
| Period |
starts 07-07-2024 ends 12-07-2024 |
| Keywords | Astroparticle physics, Multi-messenger astronomy, Choked jets, Gamma-Ray Bursts |
| Report |
The scientific objective of the Marcel Grossmann Meetings is to bring together scientists from diverse backgrounds in order to deepen the understanding of developments in theoretical physics and astrophysics, as well as review the status of their experimental status. I was invited to give a talk in the parallel session ‘Neutrinos in the multi-messenger era’. I presented my work 'Towards multi-messenger observations of core-collapse supernovae harbouring choked jets', submitted at the moment of the contribution. I discussed the scenario of choked jets embedded in core-collapse supernovae (CCSNe), that over the last decade has attracted careful attention. The extended stellar envelopes of red supergiant (RSG) and blue supergiant (BSG) stars, both progenitors of Type II SNe, may constitute a challenge to the launch of a powerful jet able to burrow through their envelopes. As the jet carves its way through them, it dissipates its energy in a double-shock structure that forms at its head. The hot head material spills sideways, forming a cocoon that engulfs the jet and collimates it. If before choking the jet crossed a significant fraction of the stellar envelope, the cocoon is energetic enough to break out of the star, releasing ultraviolet (UV) and optical (O) emissions lasting over a few days. For a proper characterisation of RSGs and BSGs, the identification of both these electromagnetic signals is of paramount importance, because of the low probability for gamma rays to emerge. I discussed prospects in measuring UV emission, in view of the launch in 2026 of the satellite ULTRASAT which will operate in the UV band, complementing the performances of the currently active optical telescope ZTF. Furthermore, choked jets are also fascinating within the growing field of multi-messenger astronomy, being considered as possible contributors to the astrophysical diffuse neutrino flux, not yet associated with any existing source. In this regard, I discuss the possibility of exploiting multi-messenger detection on how to set multi-messenger observations among UV/O/neutrino telescopes, optimising combined detections between different facilities. Slides available here: https://indico.icranet.org/event/8/contributions/1825/attachments/435/944/Zegarelli_MG_PescaraJuly2024.pdf |