Stellar and planetary characterization of two Kepler multi-planet systems from high-quality Gem- ini/GRACES spectra

JOFRE, E.; PETRUCCI, R.

Pasadena

Workshop; 2018 Sagan Exoplanet Summer Workshop; 2018

CALTECH

Our knowledge of planetary structure and composition is strongly linked to our knowledge of a series of fundamental parameters of their host stars. In particular, the mass and radius of a transiting planet depend critically on the mass and radius of the parent star. These physical stellar properties, in turn, depend on the precise measurement of the atmospheric parameters of the star, which can be derived from high-quality spectra. Based on GRACES high resolution and high signal-to-noise ratio spectra obtained at Gemini North, we present the first detailed chemical abundance analysis of two Kepler evolved multi-planet hosting stars. We determined atmospheric parameters and chemical abundances of 20 elements (Li, C, N, O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Y, and Ba) from equivalent widths and synthesis analysis. In addition, from the precise fundamental parameters we derive refined stellar and planetary physical properties.