MPS-ATLAS: A fast all-in-one code for synthesising stellar spectra

Abstract

Context. Stellar spectral synthesis is essential for various applications, ranging from determining stellar parameters to comprehensive stellar variability calculations. New observational resources as well as advanced stellar atmosphere modelling, taking three dimensional (3D) effects from radiative magnetohydrodynamics calculations into account, require a more efficient radiative transfer. Aims. For accurate, fast and flexible calculations of opacity distribution functions (ODFs), stellar atmospheres and stellar spectra we developed an efficient code building on the well-established ATLAS9 code. The new code also paves the way for an easy and fast access to different elemental compositions in stellar calculations. Methods. For the generation of ODF tables we further developed the well-established DFSYNTHE code by implementing additional functionality, and a speed-up by employing a parallel computation scheme. In addition, the line lists used can be changed from Kurucz's recent lists. In particular, we implemented the VALD3 line list. Results. A new code, the Merged Parallelised Simplified ATLAS is presented. It combines the efficient generation of ODF, atmosphere modelling and spectral synthesis in local thermodynamic equilibrium, therefore being an all-in-one code. This all-in-one code provides more numerical functionality and is substantially faster compared to other available codes. The fully portable MPS-ATLAS code is validated against previous ATLAS9 calculations, the PHOENIX code calculations, and high quality observations.

22 pages, 22 figures, accepted for publication in A&A

References in corpus (8)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• Center-to-Limb Variation of Solar 3-D Hydrodynamical Simulations
• A brief introductory guide to TLUSTY and SYNSPEC
• Spectral variability of photospheric radiation due to faculae I: The Sun and Sun-like stars
• SAtlas: Spherical Versions of the Atlas Stellar Atmosphere Program
• Stellar atmospheric parameters of FGK-type stars from high-resolution optical and near-infrared CARMENES spectra
• Readdressing the UV solar variability with SATIRE-S: non-LTE effects
• Opacity distribution functions for stellar spectra synthesis

Cited by in corpus (4)

• Stellar limb darkening. A new MPS-ATLAS library for Kepler, TESS, CHEOPS, and PLATO passbands
• On the impact of spectral template uncertainties in synthetic stellar populations
• Emergent Spectral Fluxes of Hot Jupiters: an Abrupt Rise in Day Side Brightness Temperature Under Strong Irradiation
• Modelling continuum intensity perturbations caused by solar acoustic oscillations