Chemical Abundances for 25 JWST Exoplanet Host Stars with KeckSpec
Alex S. Polanski, Ian J. M. Crossfield, Andrew W. Howard, Howard Isaacson, Malena Rice
Abstract
Abstract Using a data-driven machine learning tool we report T eff , <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi> <mml:mo stretchy="true">(</mml:mo> <mml:mi>g</mml:mi> <mml:mo stretchy="true">)</mml:mo> </mml:math> , <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>v</mml:mi> <mml:mi>sin</mml:mi> <mml:mo stretchy="true">(</mml:mo> <mml:mi>i</mml:mi> <mml:mo stretchy="true">)</mml:mo> </mml:math> , 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 ∼4500 FGK stars derived from Keck/HIRES optical spectra.