Relativistic Jets in the Multimessenger Era
Multijets - ERC Advanced Research Grant
Oct. 2022 – Sept. 2027
This is a research project funded by an advanced ERC grant – Multijets. The project
deals with four different aspects of relativistic jets.
Apply for a postdoc or graduate student position
Current Postdocs:
Matteo Pais Dima Ofengeim
Students:
Nuria Navaro
Collaborators:
Ehud Nakar Julian Krolik Yuri Lyubarski Zhenya Derishev Taeho Ryu
Projects.
WP1: Gravitational waves from Jets: Jet - GW
Acceleration of jets to ultra-relativistic velocity produces a unique gravitational wave signal. This signal can identify the nature of acceleration mechanism and reveal hidden jets, such as those that arise within Supernovae and are choked inside. For further information see: Jet Gravitational Waves
WP2: Impact of Jets on Binary Neutron Star Mergers
The binary neutron star merger GW 170817A had a jet that was pointed away from us by about 20o.We will explore the propagation of the jet within the merger ejecta and its influence on the nucleosynthesis process, the kilonova signature and the resulting shock breakout signature of the cocoon. Preliminary results: The collimation of relativistic jets in post-neutron star binary merger simulations.
A simulation of a jet propagating in a merger ejecta. The jet is injected into a realistic ejecta calculations done by KIuchi and Shibata. The panels (from left to right are) four velocity, density, pressure and jet matter racer.
Simulations and movie by Matteo Pais.
WP3: Choked jets in Supernovae and Gamma-ray Bursts.
Recent evidence suggest that some Supernovae harbor relativistic jets that are choked inside. We will explore the observational signatures of such jets and suggest methods to reveal their existence. See: The velocity distribution of outflows driven by choked jets in stellar envelopes.
A simulation of a jet expanding in a stellar envelope. Left hand side normalized velocity, right hand side normalized density. Simulations and movie by Matteo Pais.
WP4: Tidal Disruption Events
TDEs – Tidal Disruption Events take place when a star that passes near a massive black hole at a Galactic center is thorn apart and disrupted. One of their most puzzling features is that, at times, such events involve relativistic jets. We will explore how TDEs behave and, in particular, what the conditions are for the generation of jets in these events. See: Generalized equipartition method from arbitrary viewing angle Extreme relativistic tidal disruption events.
A simulation of an Extreme relativistic tidal disruption event in which the disrupted star passes very close (4.03 gravitational radii) Schwartzchild type disrupting supermassive black hole. Simulation and movie by Taeho Ryu
tA simulation of a fully relativistic long-duration tidal disruption event. This is the longest and most realistic simulation of this kind carried out so far. Notice the returning stream self-interaction shocks that most likely are the main source of the observed optical signal. Time is measured in units of the orbital time of the most bound orbit. Simulation and movie by Taeho Ryu.