Chemical analysis of early-type stars with planets: extending the samples

PAULA MIQUELARENA; JOSÉ ALACORIA; DANIELA CALVO; MARTÍN GIRARDI, G.; GARCIA, LUCIANO; FLORES MATÍAS

Córdoba

Congreso; 63 Reunión de la Asociación Argentina de Astronomía; 2021

Observatorio Astronómico de Córdoba

Metallicity plays a fundamental role in the stellar and planetary formation. Until now, most studies focused on late-type stars, while early-type stars are poorly studied. In this work, we propose to analyze a possible chemicalsignature of planet formation in a sample of early-type stars with planets. This will allow us to test stellar and planetary formation in the high-mass regime (M > 1.3 Mo), which is almost unexplored.Importantly, our sample would be the largest and most significant group homogeneously studied to date, including 85% of the presently known early-type stars with planets. This will enable us to address important questions such as planet formation scenarios (core accretion vs. gravitationalinstability) and the possible link between planet formation and λ Bootis stars. In this contribution, we are extending the previous sample through CASLEO+REOSC, MPG2.2m+FEROS and Gemini+GRACES spectra.