Asteroseismic Stellar Modelling with AIMS

Abstract

The goal of AIMS (Asteroseismic Inference on a Massive Scale) is to estimate stellar parameters and credible intervals/error bars in a Bayesian manner from a set of asteroseismic frequency data and so-called classical constraints. To achieve reliable parameter estimates and computational efficiency, it searches through a grid of pre-computed models using an MCMC algorithm -- interpolation within the grid of models is performed by first tessellating the grid using a Delaunay triangulation and then doing a linear barycentric interpolation on matching simplexes. Inputs for the modelling consist of individual frequencies from peak-bagging, which can be complemented with classical spectroscopic constraints. AIMS is mostly written in Python with a modular structure to facilitate contributions from the community. Only a few computationally intensive parts have been rewritten in Fortran in order to speed up calculations.

11 pages, 4 figures. Tutorial presented at the IVth Azores International Advanced School in Space Sciences on "Asteroseismology and Exoplanets: Listening to the Stars and Searching for New Worlds" (arXiv:1709.00645), which took place in Horta, Azores Islands, Portugal in July 2016

References in corpus (5)

• emcee: The MCMC Hammer
• ADIPLS -- the Aarhus adiabatic oscillation package
• An in-depth study of grid-based asteroseismic analysis
• A Bayesian approach to the modelling of alpha Cen A
• Bayesian Asteroseismology of 23 Solar-Like Kepler Targets

Cited by in corpus (9)

• Chronologically dating the early assembly of the Milky Way
• SPInS, a pipeline for massive stellar parameter inference: A public Python tool to age-date, weigh, size up stars, and more
• Investigating surface correction relations for RGB stars
• Tess asteroseismology of the known planet host star ${\lambda }^2$ Fornacis
• On the impact of the structural surface effect on global stellar properties and asteroseismic analyses
• Testing abundance-age relations beyond solar analogues with Kepler LEGACY stars
• $\alpha$ Centauri A as a potential stellar model calibrator: establishing the nature of its core
• Fundamental properties of a selected sample of Ap stars: Inferences from interferometric and asteroseismic constraints
• On the nature of the core of $\alpha$ Centauri A: the impact of the metallicity mixture