Chemical analysis of early-type stars with planets

J. ALARCORIA; P. MIQUELARENA; D. CALVO; G. MARTIN

Congreso; Five years after HL Tau: a new era in planet formation; 2020

ESO/NRAO/ALMA

To date, important metallicity trends are known for the case of late-type stars with planets, while early-type stars with planets are comparatively poorly studied. In this contribution, we present some preliminary results obtained for a sample of early-type stars with planets (mostly A-type stars) with and without planets. We want to study the possible relation between the presence of planets and the Lambda Boötis chemical pattern. The Lambda Boötis stars are a group of chemically peculiar objects on the upper main-sequence, showing underabundances (1-2 dex) of iron peak elements and near-solar abundances of C, N, O and S. We also want to search for possible trends between the stellar metallicity and planetary characteristics such as the mass and radius.