431 citations · 1.2k across the 25 of their papers we have counts for
23 papers · 1 filter
Two-dimensional simulations of internal gravity waves in a 5 Zero-Age-Main-Sequence model
A. Le Saux, I. Baraffe, T. Guillet +5
Main-sequence intermediate-mass stars present a radiative envelope that supports internal gravity waves (IGWs). Excited at the boundary with the convective core, IGWs propagate tow…
A study of convective core overshooting as a function of stellar mass based on two-dimensional hydrodynamical simulations
I. Baraffe, J. Clarke, A. Morison +6
We perform two-dimensional numerical simulations of core convection for zero-age-main-sequence stars covering a mass range from 3 to 20 . The simulations are per…
Impact of radial truncation on global 2D hydrodynamic simulations for a Sun-like model
D. G. Vlaykov, I. Baraffe, T. Constantino +5
Stellar convection is a non-local process responsible for the transport of heat and chemical species. It can lead to enhanced mixing through convective overshooting and excitation…
Two-dimensional simulations of solar-like models with artificially enhanced luminosity. II. Impact on internal gravity waves
A. Le Saux, T. Guillet, I. Baraffe +7
Artificially increasing the luminosity and the thermal diffusivity of a model is a common tactic adopted in hydrodynamical simulations of stellar convection. In this work, we analy…
Local heating due to convective overshooting and the solar modelling problem
Baraffe I, Constantino T, Clarke J +5
Recent hydrodynamical simulations of convection in a solar-like model suggest that penetrative convective flows at the boundary of the convective envelope modify the thermal backgr…
Dynamics in a stellar convective layer and at its boundary: Comparison of five 3D hydrodynamics codes
R. Andrassy, J. Higl, H. Mao +18
Our ability to predict the structure and evolution of stars is in part limited by complex, 3D hydrodynamic processes such as convective boundary mixing. Hydrodynamic simulations he…
Two-dimensional simulations of solar-like models with artificially enhanced luminosity -- I. Impact on convective penetration
I. Baraffe, J. Pratt, D. G. Vlaykov +4
We perform 2D, fully compressible, time-implicit simulations of convection in a solar-like model with the MUSIC code. Our main motivation is to explore the impact of a common tacti…
Suppression of lithium depletion in young low-mass stars from fast rotation
Thomas Constantino, Isabelle Baraffe, Thomas Goffrey +4
We compute rotating 1D stellar evolution models that include a modified temperature gradient in convection zones and criterion for convective instability inspired by rotating 3D hy…
Comparison of two- and three-dimensional compressible convection in a pre-main sequence star
J. Pratt, I. Baraffe, T. Goffrey +4
Extending our recent studies of two-dimensional stellar convection to 3D, we compare three-dimensional hydrodynamic simulations to identically set-up two-dimensional simulations, f…
The Aarhus red giants challenge II. Stellar oscillations in the red giant branch phase
J. Christensen-Dalsgaard, V. Silva Aguirre, S. Cassisi +23
Context. The large quantity of high-quality asteroseismic data that obtained from space-based photometric missions and the accuracy of the resulting frequencies motivate a careful…
The Aarhus Red Giants Challenge I: Stellar structures in the red giant branch phase
V. Silva Aguirre, J. Christensen-Dalsgaard, S. Cassisi +23
(Abridged). We introduce the Aarhus Red Giants Challenge, a series of detailed comparisons between widely used stellar evolution and oscillation codes aiming at establishing the mi…
A well-balanced scheme for the simulation tool-kit A-MaZe: implementation, tests, and first applications to stellar structure
M. V. Popov, R. Walder, D. Folini +6
Characterizing stellar convection in multiple dimensions is a topic at the forefront of stellar astrophysics. Numerical simulations are an essential tool for this task. We present…
Significant uncertainties from calibrating overshooting with eclipsing binary systems
Thomas Constantino, Isabelle Baraffe
The precise measurement of the masses and radii of stars in eclipsing binary systems provides a window into uncertain processes in stellar evolution, especially mixing at convectiv…
The treatment of mixing in core helium burning models -- III. Suppressing core breathing pulses with a new constraint on overshoot
Thomas Constantino, Simon W. Campbell, John C. Lattanzio
Theoretical predictions for the core helium burning phase of stellar evolution are highly sensitive to the uncertain treatment of mixing at convective boundaries. In the last few y…
Lithium depletion in solar-like stars: effect of overshooting based on realistic multi-dimensional simulations
I. Baraffe, J. Pratt, T. Goffrey +5
We study lithium depletion in low-mass and solar-like stars as a function of time, using a new diffusion coefficient describing extra-mixing taking place at the bottom of a convect…
Extreme value statistics for two-dimensional convective penetration in a pre-Main Sequence star
J. Pratt, I. Baraffe, T. Goffrey +5
We examine a penetration layer formed between a central radiative zone and a large convection zone in the deep interior of a young low-mass star. Using the Multidimensional Stellar…
Spherical-shell boundaries for two-dimensional compressible convection in a star
J. Pratt, I. Baraffe, T. Goffrey +6
Context: We study the impact of two-dimensional spherical shells on compressible convection. Realistic profiles for density and temperature from a one-dimensional stellar evolution…
Multi-dimensional structure of accreting young stars
C. Geroux, I. Baraffe, M. Viallet +6
This work is the first attempt to describe the multi-dimensional structure of accreting young stars based on fully compressible time implicit multi-dimensional hydrodynamics simula…
The treatment of mixing in core helium burning models -- II. Constraints from cluster star counts
Thomas Constantino, Simon W. Campbell, John C. Lattanzio +1
The treatment of convective boundaries during core helium burning is a fundamental problem in stellar evolution calculations. In Paper~I we showed that new asteroseismic observatio…
The treatment of mixing in core helium burning models - I. Implications for asteroseismology
Thomas Constantino, Simon W. Campbell, Joergen Christensen-Dalsgaard +2
The detection of mixed oscillation modes offers a unique insight into the internal structure of core helium burning (CHeB) stars. The stellar structure during CHeB is very uncertai…
Diagnostics of Stellar Modelling from Spectroscopy and Photometry of Globular Clusters
George Angelou, Valentina D'Orazi, Thomas Constantino +3
We conduct a series of comparisons between spectroscopic and photometric observations of globular clusters and stellar models to examine their predictive power. Data from medium-to…
On the necessity of composition-dependent low-temperature opacity in metal-poor AGB stars
Thomas Constantino, Simon Campbell, Pilar Gil-Pons +1
The vital importance of composition-dependent low-temperature opacity in low-mass (M < 3Msun) asymptotic giant branch (AGB) stellar models of metallicity Z > 0.001 has recently bee…
Sodium content as a predictor of the advanced evolution of globular cluster stars
Simon W. Campbell, Valentina D'Orazi, David Yong +6
The asymptotic giant branch (AGB) phase is the final stage of nuclear burning for low-mass stars. Although Milky Way globular clusters are now known to harbour (at least) two gener…