Chemical analysis of early-type stars with planets

ALACORIA, J; MIQUELARENA, P.; CALVO, D.; MARTÍN GIRARDI, G.

Santiago de Chile

Conferencia; International Conference "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.