Lambda bootis stars as tracers of planet formation

MIQUELARENA, P.; ALACORIA, J.; CALVO, D.; MARTIN GIRARDI, G.; FLORES, M.; JAQUE ARANCIBIA, M.; COLLADO, A.; GUNELLA, F.; SAFFE, C.

Córdoba

Congreso; Friend of Friends 2021; 2021

IATE

We study the possible chemical signature of planet formation in early-type stars with planets. In particular, we analyze a likely relation between the  Boo chemical pattern and the presence of giant planets by using spectral synthesis. Our first sample includes 13 stars with planets and 24 stars without detected planets. We have detected four lambda Boo stars in our sample, two of which present planets and circumstellar disks (HR 8799 and HD 169142) and one without detected planets (HD 110058). We also identified the first  Boo star which is orbited by a brown dwarf ( Del). Our results support a scenario in which giant planets orbiting pre-main-sequeunce stars block the dust of the disk and result in a  Boo pattern. On the other hand, we do not support a proposed scenario in which the winds form hot-Jupiter planets could produce a  Boo pattern on early-type stars.