KELT-17: a chemically peculiar Am star and a hot-Jupiter planet

ALACORIA, JOSÉ; MIQUELARENA, PAULA; CALVO, DANIELA; MARTIN GIRARDI, GIMENA; FLORES, MATÍAS; JAQUE ARANCIBIA, MARCELO; COLLADO, ANA; GUNELLA, FERNANDO; SAFFE, CARLOS

Córdoba

Congreso; Friends of Friends Virtual Meeting 2021; 2021

Instituto de Astronomía Teórica y Experimental (IATE)

There is very little information to be found in the literature regarding the detection of planets orbiting chemically peculiar stars. We carried out a detailed abundance determination in the planet host star KELT-17 via spectral synthesis. Also, we estimated the stellar radius using two methods: a) comparing the synthetic spectral energy distribution with the available photometric data and the Gaia parallax, and b) using a Bayesian estimation of stellar parameters using stellar isochrones. We found over-abundances of Ti, Cr, Mn, Fe, Ni, Zn, Sr, Y, Zr, and Ba, together with subsolar values of Ca and Sc. Notably, the chemical pattern agrees with those recently published for Am stars, making KELT-17 the first exoplanet host whose complete chemical pattern is unambiguously identified with this class. The stellar radius derived by two different methods agrees to each other and with those previously obtained in the literature.