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Catastrophic Interactions of Binary Stars and the Associated Transients

Total Cost €


EC-Contrib. €






 Cat-In-hAT project word cloud

Explore the words cloud of the Cat-In-hAT project. It provides you a very rough idea of what is the project "Cat-In-hAT" about.

dynamical    domain    binaries    stability    mesh    physical    dust    timescale    break    object    polarimetric    ground    star    brightenings    comprehensively    exhibiting    motivated    moving    least    paradigm    examine    rt    gravitational    despite    accompanied    urgently    entirely    cee    evolution    variant    transient    interactions    depends    waves    outburst    chemical    momentum    microphysics    molecules    remnant    perhaps    physics    progress    spectra    reactions    3d    critically    merger    angles    orbital    transients    commences    copious    surveys    angular    light    timescales    envelope    wave    channels    detectors    time    amplification    inaccessible    catastrophic    observations    mass    regime    sources    slow    dimensional    theoretical    coupling    area    velocities    curves    illuminate    probe    compact    magnetohydrodynamics    interpret    predictions    centuries    moment    signatures    remnants    red    line    binary    class    resolve    unbind    expansion    magnetic    energy    profiles    radiation    fundamental    hydrodynamics    facilities    connect   

Project "Cat-In-hAT" data sheet

The following table provides information about the project.


Organization address
address: OVOCNY TRH 560/5
city: PRAHA 1
postcode: 116 36

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Czech Republic [CZ]
 Total cost 1˙243˙218 €
 EC max contribution 1˙243˙218 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2018-STG
 Funding Scheme ERC-STG
 Starting year 2019
 Duration (year-month-day) from 2019-01-01   to  2023-12-31


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    UNIVERZITA KARLOVA CZ (PRAHA 1) coordinator 1˙243˙218.00


 Project objective

'One of the crucial formation channels of compact object binaries, including sources of gravitational waves, critically depends on catastrophic binary interactions accompanied by the loss of mass, angular momentum, and energy ('common envelope' evolution - CEE). Despite its importance, CEE is perhaps the least understood major phase of binary star evolution and progress in this area is urgently needed to interpret observations from the new facilities (gravitational wave detectors, time-domain surveys).

Recently, the dynamical phase of the CEE has been associated with a class of transient brightenings exhibiting slow expansion velocities and copious formation of dust and molecules (red transients - RT). A number of RT features, especially the long timescale of mass loss, challenge the existing CEE paradigm.

Motivated by RT, I will use 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. I expect to resolve the long timescales observed in RT, characterize binary stability in 3D with detailed microphysics, illuminate the fundamental problem of how is orbital energy used to unbind the common envelope in a regime that was inaccessible before, and break new ground on the amplification of magnetic fields during CEE.

I will establish RT as an entirely new probe of the CEE physics by comparing my detailed theoretical predictions of light curves from different viewing angles, spectra, line profiles, and polarimetric signatures with observations of RT. I will accomplish this by coupling multi-dimensional moving mesh hydrodynamics with radiation, dust formation, and chemical reactions. Finally, I will examine the physical processes in RT remnants on timescales of years to centuries after the outburst to connect RT with the proposed merger products and to identify them in time-domain surveys. '

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The information about "CAT-IN-HAT" are provided by the European Opendata Portal: CORDIS opendata.

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