AIMS - A new tool for stellar parameter determinations using asteroseismic constraints

Abstract

A key aspect in the determination of stellar properties is the comparison of observational constraints with predictions from stellar models. Asteroseismic Inference on a Massive Scale (AIMS) is an open source code that uses Bayesian statistics and a Markov Chain Monte Carlo approach to find a representative set of models that reproduce a given set of classical and asteroseismic constraints. These models are obtained by interpolation on a pre-calculated grid, thereby increasing computational efficiency. We test the accuracy of the different operational modes within AIMS for grids of stellar models computed with the Liège stellar evolution code (main sequence and red giants) and compare the results to those from another asteroseismic analysis pipeline, PARAM. Moreover, using artificial inputs generated from models within the grid (assuming the models to be correct), we focus on the impact on the precision of the code when considering different combinations of observational constraints (individual mode frequencies, period spacings, parallaxes, photospheric constraints,...). Our tests show the absolute limitations of precision on parameter inferences using synthetic data with AIMS, and the consistency of the code with expected parameter uncertainty distributions. Interpolation testing highlights the significance of the underlying physics to the analysis performance of AIMS and provides caution as to the upper limits in parameter step size. All tests demonstrate the flexibility and capability of AIMS as an analysis tool and its potential to perform accurate ensemble analysis with current and future asteroseismic data yields.

Accepted for publication in MNRAS. 17 pages, 17 figures

References in corpus (23)

• The Transiting Exoplanet Survey Satellite
• The K2 Mission: Characterization and Early results
• Astrophysics Source Code Library
• Basic physical parameters of a selected sample of evolved stars
• Correcting stellar oscillation frequencies for near-surface effects
• Standing on the shoulders of Dwarfs: the Kepler asteroseismic LEGACY sample II - radii, masses, and ages
• Synthetic Stellar Photometry - I. General considerations and new transformations for broad-band systems
• Standing on the shoulders of Dwarfs: the $Kepler$ asteroseismic LEGACY sample I - oscillation mode parameters
• CLES, Code Liegeois d'Evolution Stellaire
• A new correction of stellar oscillation frequencies for near-surface effects
• Asteroseismology for "à la carte" stellar age-dating and weighing: Age and mass of the CoRoT exoplanet host HD 52265
• The First APOKASC Catalog of Kepler Dwarf and Subgiant Stars
• The Liege Oscillation Code
• Determining stellar parameters of asteroseismic targets: going beyond the use of scaling relations
• A Stellar Model-fitting Pipeline for Asteroseismic Data from the Kepler Mission
• First Results From The Hertzsprung Song Telescope: Asteroseismology Of The G5 Subgiant Star {\Mu}Her
• On the proper use of the Schwarzschild and Ledoux criteria in stellar evolution computations
• Synthetic Stellar Photometry - II. Testing the bolometric flux scale, and tables of bolometric corrections for the Hipparcos/Tycho, Pan-STARRS1, SkyMapper and JWST systems
• Modelling Kepler Red Giants in Eclipsing Binaries:Calibrating the Mixing Length Parameter with Asteroseismology
• On deriving p-mode parameters for inclined solar-like stars
• Seismic measurement of the locations of the base of convection zone and helium ionization zone for stars in the {\it Kepler} seismic LEGACY sample
• Asteroseismology and Exoplanets: Proceedings of the IVth Azores International Advanced School in Space Sciences
• Inference from adiabatic analysis of solar-like oscillations in Red giants

Cited by in corpus (5)

• Age dating of an early Milky Way merger via asteroseismology of the naked-eye star $\nu$ Indi
• A seismic scaling relation for stellar age
• Chemical mixing in low mass stars: I. Rotation against atomic diffusion including radiative accelerations
• On the nature of the core of $\alpha$ Centauri A: the impact of the metallicity mixture
• Progress in global helioseismology: a new light on the solar modelling problem and its implications for solar-like stars