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COBOM SIGNED

Convective Boundary Mixing in Stars

Total Cost €

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EC-Contrib. €

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Partnership

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Project "COBOM" data sheet

The following table provides information about the project.

Coordinator
THE UNIVERSITY OF EXETER 

Organization address
address: THE QUEEN'S DRIVE NORTHCOTE HOUSE
city: EXETER
postcode: EX4 4QJ
website: www.ex.ac.uk

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 United Kingdom [UK]
 Total cost 2˙500˙000 €
 EC max contribution 2˙500˙000 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2017-ADG
 Funding Scheme ERC-ADG
 Starting year 2018
 Duration (year-month-day) from 2018-09-01   to  2023-08-31

 Partnership

Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    THE UNIVERSITY OF EXETER UK (EXETER) coordinator 2˙500˙000.00

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 Project objective

Stellar evolution models are fundamental to nearly all fields of astrophysics, from exoplanet to galactic and extra-galactic research. The heart of the COBOM project is to develop a global physical picture of fundamental mixing processes in stars in order to derive robust and predictive stellar evolution models. The complex dynamics of flows at convective boundaries is a key process in stellar interiors that drives the transport of chemical species and heat, strongly affecting the structure and the evolution of many types of stars. The same physical processes can also drive transport of angular momentum, affecting the rotation evolution and the generation of magnetic field of stars. The treatment of mixing processes at convective boundaries (also referred to as overshooting) is currently one of the major uncertainties in stellar evolution theory. This mixing can dramatically affect the size of a convective core, the lifetime of major burning phases or the surface chemistry over a wide range of stellar masses. The main objectives of this project are to (1) develop a global theoretical framework to describe mixing and heat transport at convective boundaries in stellar interiors, (2) derive new physically-based transport coefficients and parametrizations for one-dimensional stellar evolution models and (3) test the new formalisms against a wide range of observations. We will accomplish these goals by performing the most comprehensive study ever performed of mixing processes in stars using a fundamentally new approach. We will combine the power of multi-dimensional fully compressible time implicit magneto-hydrodynamic simulations and rare event statistics, which are usually applied in finance or climate science. The key strength of the project is to establish a direct link between multi-dimensional results and observations (asteroseismology, eclipsing binaries, color-magnitude diagrams) via the exploitation of 1D stellar evolution models.

 Publications

year authors and title journal last update
List of publications.
2019 N. J. Mayne, B. Drummond, F. Debras, E. Jaupart, J. Manners, I. A. Boutle, I. Baraffe, K. Kohary
The Limits of the Primitive Equations of Dynamics for Warm, Slowly Rotating Small Neptunes and Super Earths
published pages: 56, ISSN: 1538-4357, DOI: 10.3847/1538-4357/aaf6e9
The Astrophysical Journal 871/1 2020-04-15
2020 F. Debras, N. Mayne, I. Baraffe, E. Jaupart, P. Mourier, G. Laibe, T. Goffrey, J. Thuburn
Acceleration of superrotation in simulated hot Jupiter atmospheres
published pages: A2, ISSN: 0004-6361, DOI: 10.1051/0004-6361/201936110
Astronomy & Astrophysics 633 2020-04-15
2019 P. Tremblin, T. Padioleau, M. W. Phillips, G. Chabrier, I. Baraffe, S. Fromang, E. Audit, H. Bloch, A. J. Burgasser, B. Drummond, M. González, P. Kestener, S. Kokh, P.-O. Lagage, M. Stauffert
Thermo-compositional Diabatic Convection in the Atmospheres of Brown Dwarfs and in Earth’s Atmosphere and Oceans
published pages: 144, ISSN: 1538-4357, DOI: 10.3847/1538-4357/ab05db
The Astrophysical Journal 876/2 2020-04-15
2019 M. V. Popov, R. Walder, D. Folini, T. Goffrey, I. Baraffe, T. Constantino, C. Geroux, J. Pratt, M. Viallet, R. Käppeli
A well-balanced scheme for the simulation tool-kit A-MaZe: implementation, tests, and first applications to stellar structure
published pages: A129, ISSN: 0004-6361, DOI: 10.1051/0004-6361/201834180
Astronomy & Astrophysics 630 2020-04-15
2020 M. W. Phillips, P. Tremblin, I. Baraffe, G. Chabrier, N. F. Allard, F. Spiegelman, J. M. Goyal, B. Drummond, and E. Hébrard
A new set of atmosphere and evolution models for cool T–Y brown dwarfs and giant exoplanets
published pages: , ISSN: 0004-6000, DOI:
Astronomy & Astrophysics in press 2020-04-15
2018 Isabelle Baraffe, Gilles Chabrier
A closer look at the transition between fully convective and partly radiative low-mass stars
published pages: A177, ISSN: 0004-6361, DOI: 10.1051/0004-6361/201834062
Astronomy & Astrophysics 619 2020-04-15
2020 J. Pratt, I. Baraffe, T. Goffrey, C. Geroux, T. Constantino, D. Folini, R. Walder
Comparison of two- and three-dimensional compressible convection in a pre-main sequence star
published pages: , ISSN: 0004-6000, DOI:
Astronomy & Astrophysics in press 2020-04-15
2019 Thomas Guillet, Rüdiger Pakmor, Volker Springel, Praveen Chandrashekar, Christian Klingenberg
High-order magnetohydrodynamics for astrophysics with an adaptive mesh refinement discontinuous Galerkin scheme
published pages: 4209-4246, ISSN: 0035-8711, DOI: 10.1093/mnras/stz314
Monthly Notices of the Royal Astronomical Society 485/3 2020-04-15
2019 F. Sainsbury-Martinez, P. Wang, S. Fromang, P. Tremblin, T. Dubos, Y. Meurdesoif, A. Spiga, J. Leconte, I. Baraffe, G. Chabrier, N. Mayne, B. Drummond, F. Debras
Idealised simulations of the deep atmosphere of hot Jupiters
published pages: A114, ISSN: 0004-6361, DOI: 10.1051/0004-6361/201936445
Astronomy & Astrophysics 632 2020-04-15

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