1. The BAyesian STellar algorithm (BASTA): A fitting tool for stellar studies, asteroseismology, exoplanets, and Galactic archaeology
- Author
-
J. L. Rørsted, Guy R. Davies, J. R. Larsen, M. L. Winther, Aldo Serenelli, Kuldeep Verma, Timothy R. White, Mikkel N. Lund, Christian L. Sahlholdt, Anders Bo Justesen, Luca Casagrande, Amalie Stokholm, K. B. Nielsen, Santi Cassisi, Jason W. Ferguson, A. Weiss, Joergen Christensen-Dalsgaard, Emil Knudstrup, V. Aguirre Børsen-Koch, Danish National Research Foundation, Villum Fonden, Independent Research Fund Denmark, Carlsberg Foundation, Istituto Nazionale di Fisica Nucleare, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Commission, European Research Council, and DNK
- Subjects
Red giant ,INITIAL MASS FUNCTION ,statistical [methods] ,fundamental parameters [stars] ,FOS: Physical sciences ,asteroseismology ,01 natural sciences ,Asteroseismology ,HOT JUPITER ,EVOLUTION MODELS ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,MAIN-SEQUENCE ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Methods: statistical ,Stars: fundamental parameters ,Earth and Planetary Astrophysics (astro-ph.EP) ,Physics ,Methods: numerical ,010308 nuclear & particles physics ,Subgiant ,Astronomy and Astrophysics ,Observable ,numerical [methods] ,Astrometry ,Astrophysics - Astrophysics of Galaxies ,Exoplanet ,SCREENING FACTORS ,RED GIANTS ,Stars ,Photometry (astronomy) ,Astrophysics - Solar and Stellar Astrophysics ,FUNDAMENTAL PROPERTIES ,Space and Planetary Science ,TESTING SCALING RELATIONS ,Astrophysics of Galaxies (astro-ph.GA) ,NUCLEAR-REACTIONS ,Astrophysics::Earth and Planetary Astrophysics ,Algorithm ,SOLAR-LIKE OSCILLATIONS ,Astrophysics - Earth and Planetary Astrophysics - Abstract
We introduce the public version of the BAyesian STellar Algorithm (BASTA), an open-source code written in PYTHON to determine stellar properties based on a set of astrophysical observables. BASTA has been specifically designed to robustly combine large data sets that include asteroseismology, spectroscopy, photometry, and astrometry. We describe the large number of asteroseismic observations that can be fit by the code and how these can be combined with atmospheric properties (as well as parallaxes and apparent magnitudes), making it the most complete analysis pipeline available for oscillating main-sequence, subgiant, and red giant stars. BASTA relies on a set of pre-built stellar isochrones or a custom-designed library of stellar tracks, which can be further refined using our interpolation method (both along and across stellar tracks or isochrones). We perform recovery tests with simulated data that reveal levels of accuracy at the few percent level for radii, masses, and ages when individual oscillation frequencies are considered, and show that asteroseismic ages with statistical uncertainties below 10 per cent are within reach if our stellar models are reliable representations of stars. BASTAis extensively documented and includes a suite of examples to support easy adoption and further development by new users., Funding for the Stellar Astrophysics Centre is provided by The Danish National Research Foundation (Grant agreement No. DNRF106). VAB-K acknowledges support from VILLUM FONDEN (research grant 10118), the Independent Research Fund Denmark (Research grant 7027-00096B), and the Carlsberg foundation (grant agreement CF19-0649). SC acknowledges support from Premiale INAF MITiC (PI: B. Garilli), from Istituto Nazionale di Fisica Nucleare (INFN) (Iniziativa specifica TAsP), from Progetto Mainstream INAF (PI: S. Cassisi) and grant AYA2013- 42781P from the Ministry of Economy and Competitiveness of Spain. AMS is partially supported by grant PID2019-108709GB-I00 of the MICINN of Spain. AS acknowledge support from the European Research Council Consolidator Grant funding scheme (project ASTEROCHRONOMETRY, G.A. n. 772293, http://www.asterochronometry.eu).
- Published
- 2022
- Full Text
- View/download PDF