Modelling stars with Gaussian Process Regression: augmenting stellar model grid

Tanda Li, Guy R. Davies, Alexander J. Lyttle, Warrick H. Ball, Lindsey M. Carboneau, Rafael A. Garcia

Research output: Contribution to journalArticlepeer-review

4 Downloads (Pure)


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.
Original languageEnglish
Pages (from-to)5597–5610
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date21 Feb 2022
Publication statusPublished - Apr 2022


  • astro-ph.SR
  • astro-ph.GA
  • astro-ph.IM
  • methods: statistical
  • stars: evolution
  • stars: statistics


Dive into the research topics of 'Modelling stars with Gaussian Process Regression: augmenting stellar model grid'. Together they form a unique fingerprint.

Cite this