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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2022

Modelling stars with Gaussian Process Regression: augmenting stellar model grid

Tanda Li
  • Function : Author
Guy Davies
  • Function : Author
Alexander Lyttle
Warrick Ball
Lindsey Carboneau
  • Function : Author

Abstract

Grid-based modelling is widely used for estimating stellar parameters. However, stellar model grid is sparse because of the computational cost. This paper demonstrates an application of a machine-learning algorithm using the Gaussian Process (GP) Regression that turns a sparse model grid on to a continuous function. We train GP models to map five fundamental inputs (mass, equivalent evolutionary phase, initial metallicity, initial helium fraction, and the mixing-length parameter) to observable outputs (effective temperature, surface gravity, radius, surface metallicity, and stellar age). We test the GP predictions for the five outputs using off-grid stellar models and find no obvious systematic offsets, indicating good accuracy in predictions. As a further validation, we apply these GP models to characterize 1000 fake stars. Inferred masses and ages determined with GP models well recover true values within one standard deviation. An important consequence of using GP-based interpolation is that stellar ages are more precise than those estimated with the original sparse grid because of the full sampling of fundamental inputs.
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hal-03673986 , version 1 (21-03-2023)

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Tanda Li, Guy Davies, Alexander Lyttle, Warrick Ball, Lindsey Carboneau, et al.. Modelling stars with Gaussian Process Regression: augmenting stellar model grid. Monthly Notices of the Royal Astronomical Society, 2022, 511 (4), pp.5597-5610. ⟨10.1093/mnras/stac467⟩. ⟨hal-03673986⟩
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