The BAyesian STellar algorithm (BASTA) : A fitting tool for stellar studies, asteroseismology, exoplanets, and Galactic archaeology

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.

Rørsted, J. L.Aarhus University (author)
Justesen, A. B.Aarhus University(Swepub:lu)an3041ju (author)
Stokholm, A.Aarhus University,University of Bologna (author)
Verma, K.Aarhus University (author)
Winther, M. L.Aarhus University (author)
Knudstrup, E.Aarhus University (author)
Nielsen, K. B.Max Planck Institute for Astronomy,Aarhus University (author)
Sahlholdt, C.Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science,Aarhus University(Swepub:lu)ch7073sa (author)
Larsen, J. R.Aarhus University (author)
Cassisi, S.INAF - Osservatorio Astronomico d'Abruzzo,INFN Section of Pisa (author)
Serenelli, A. M.CSIC Institute of Space Sciences (ICE),CSIC Institut de Ciènces de l’Espai (IEEC) (author)
Casagrande, L.Australian National University (author)
Christensen-Dalsgaard, J.Aarhus University (author)
Davies, G. R.Aarhus University,University of Birmingham (author)
Ferguson, J. W.Wichita State University (author)
Lund, M. N.Aarhus University (author)
Weiss, A.Max Planck Institute for Astrophysic (author)
White, T. R.Wichita State University,University of Sydney (author)
Aarhus UniversityUniversity of Bologna (creator_code:org_t)

In:Monthly Notices of the Royal Astronomical Society: Oxford University Press (OUP)509:3, s. 4344-43640035-87111365-2966

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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