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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.

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

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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