497 citations · 2.1k across the 13 of their papers we have counts for
13 papers
The benchmark halo giant HD 122563: CNO abundances revisited with three-dimensional hydrodynamic model stellar atmospheres
Remo Collet, Åke Nordlund, Martin Asplund +2
We present an abundance analysis of the low-metallicity benchmark red giant star HD 122563 based on realistic, state-of-the-art, high-resolution, three-dimensional (3D) model stell…
The elemental composition of the Sun I. The intermediate mass elements Na to Ca
Pat Scott, Nicolas Grevesse, Martin Asplund +6
The composition of the Sun is an essential piece of reference data for astronomy, cosmology, astroparticle, space and geo-physics. This article, dealing with the intermediate-mass…
Accuracy tests of radiation schemes used in hot Jupiter global circulation models
David Skålid Amundsen, Isabelle Baraffe, Pascal Tremblin +4
The treatment of radiation transport in global circulation models (GCMs) is crucial to correctly describe Earth and exoplanet atmospheric dynamics processes. The two-stream approxi…
The Stagger-grid: A Grid of 3D Stellar Atmosphere Models - II. Horizontal and Temporal Averaging and Spectral Line Formation
Zazralt Magic, Remo Collet, Wolfgang Hayek +1
We study the implications of averaging methods with different reference depth scales for 3D hydrodynamical model atmospheres computed with the Stagger-code. The temporally and spat…
The Stagger-grid: A Grid of 3D Stellar Atmosphere Models - I. Methods and General Properties
Z. Magic, R. Collet, M. Asplund +5
We present the Stagger-grid, a comprehensive grid of time-dependent, 3D hydrodynamic model atmospheres for late-type stars with realistic treatment of radiative transfer, covering…
Limb darkening laws for two exoplanet host stars derived from 3D stellar model atmospheres
W. Hayek, D. Sing, F. Pont +1
We compare limb darkening laws derived from 3D hydrodynamical model atmospheres and 1D hydrostatic MARCS models for the host stars of the two transiting exoplanet systems HD 209458…
Simulations of the solar near-surface layers with the CO5BOLD, MURaM, and Stagger codes
B. Beeck, R. Collet, M. Steffen +6
Radiative hydrodynamic simulations of solar and stellar surface convection have become an important tool for exploring the structure and gas dynamics in the envelopes and atmospher…
On the effects of clouds and hazes in the atmospheres of hot Jupiters: semi-analytical temperature-pressure profiles
Kevin Heng, Wolfgang Hayek, Frédéric Pont +1
Motivated by the work of Guillot (2010), we present a semi-analytical formalism for calculating the temperature-pressure profiles in hot Jovian atmospheres which includes the effec…
The stellar atmosphere simulation code Bifrost
Boris V. Gudiksen, Mats Carlsson, Viggo H. Hansteen +3
Context: Numerical simulations of stellar convection and photospheres have been developed to the point where detailed shapes of observed spectral lines can be explained. Stellar at…
Hubble Space Telescope Transmission Spectroscopy of the Exoplanet HD 189733b: High-altitude atmospheric haze in the optical and near-UV with STIS
D. K. Sing, F. Pont, S. Aigrain +10
We present Hubble Space Telescope optical and near-ultraviolet transmission spectra of the transiting hot-Jupiter HD189733b, taken with the repaired Space Telescope Imaging Spectro…
Three-dimensional surface convection simulations of metal-poor stars -- The effect of scattering on the photospheric temperature stratification
R. Collet, W. Hayek, M. Asplund +3
Three-dimensional (3D) radiative hydrodynamic model atmospheres of metal-poor late-type stars are characterized by cooler upper photospheric layers than their 1D counterparts. This…
Radiative transfer with scattering for domain-decomposed 3D MHD simulations of cool stellar atmospheres
W. Hayek, M. Asplund, M. Carlsson +5
We present the implementation of a radiative transfer solver with coherent scattering in the new BIFROST code for radiative magneto-hydrodynamical (MHD) simulations of stellar surf…
Abundance Analysis of the Halo Giant HD122563 with Three-Dimensional Model Stellar Atmospheres
R. Collet, A. Nordlund, M. Asplund +2
We present a preliminary local thermodynamic equilibrium (LTE) abundance analysis of the template halo red giant HD122563 based on a realistic, three-dimensional (3D), time-depende…