Poster abstract details

The GALAH survey: Solar twins and their multiplicity
Klemen Cotar, Tomas Zwitter and the GALAH collaboration


We used a set of more than 500k high resolution spectra acquired in the scope of the GALAH survey to search for stars whose spectrum resembles the Solar spectrum. Direct spectral comparison between observed and Solar spectrum was performed for every observed object. During this comparison, Gaussian process analysis was performed to model spectral noise in the observed spectrum and reduce its influence on the used spectral similarity metrices. Spectroscopic results, combined with the Gaia DR2 distance and magnitudes, show that some of the best matching candidates exhibit excess luminosity. To determine the number of stellar components in those systems, we modeled observed spectroscopic and photometric signatures using data driven models that were trained on the real observations.