Periodic Reporting for period 3 - Cat-In-hAT (Catastrophic Interactions of Binary Stars and the Associated Transients)
Okres sprawozdawczy: 2022-01-01 do 2023-06-30
Motivated by these transients, the project Cat-In-hAT aims to develop a new variant of magnetohydrodynamics to comprehensively examine the 3D evolution of CEE from the moment when the mass loss commences to the remnant phase. The objectives are to resolve the long timescales observed in the red transients, characterize binary stability in 3D with detailed microphysics, to illuminate the fundamental problem of how is orbital energy used to unbind the common envelope in a regime that was inaccessible before, and to break new ground on the amplification of magnetic fields during CEE. This project will establish red transients as an entirely new probe of the CEE physics by comparing detailed theoretical predictions of light curves from different viewing angles, spectra, line profiles, and polarimetric signatures with observations. The project will accomplish this by coupling multi-dimensional moving mesh hydrodynamics with radiation, dust formation, and chemical reactions. Finally, the project will examine the physical processes in the aftermath of red transients on timescales of years to centuries after the outburst, connect with the proposed merger products, and to identify them in time-domain surveys.
argued that Sh 2-71 is the best known example of planetary nebula formed by Common Envelope ejection in a triple star system. We showed with high-quality space-based data that light curves of at least some classical novae are powered by shock interaction. Classical novae are in many aspects similar to common envelope events, and the connection between these two types of events is only starting to be fully explored. We performed hydrodynamical simulations of spherical explosion colliding with aspherical matter distribution with the aim of identifying which observable quantities can be used to discriminate between various environments. This is important, because different matter distributions point to different physical processes responsible for their creation. We comprehensively analyzed the progenitor and explosion of luminous red nova AT2018bwo with the help of observations, binary evolution models, and models for transient light curves. We also successfully combined multi-dimensional moving-mesh hydrodynamics and radiation transport. Our first application was for wind-reprocessed transients, but this is the tool we will use extensively to understand common envelope ejections.
We expect that until the end of the project we will apply our newly-developed moving-mesh radiation hydrodynamics tool to common-envelope transients to determine the mechanism that powers them. We also expect to perform (magneto)hydrodynamical simulation in the low-Mach regime relevant for certain stages of common envelope.