Chemical Abundances for 25 JWST Exoplanet Host Stars with KeckSpec

Abstract

Using a data-driven machine learning tool we report T_(eff), log(g), vsin(i), and elemental abundances for 15 elements (C, N, O, Na, Mg, Al, Si, Ca, Ti, V, Cr, Mn, Fe, Ni, Y) for a sample of 25 exoplanet host stars targeted by JWST's first year of observations. The chemical diversity of these stars show that, while a number of their companion planets may have formed in a disk with chemistry similar to Solar, some JWST targets likely experienced different disk compositions. This sample is part of a larger forthcoming catalog that will report homogeneous abundances of ∼4,500 FGK stars derived from Keck/HIRES spectra.

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