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Searching for planets around metal-poor stars

João P. Faria

Stellar metallicity and planet formation are intimately linked. According to the core accretion planet formation model, low-mass planets are expected to orbit stars with a wide range of metallicities, while giant planets should be more common around metal-rich stars. But the existence of a planet-metallicity relation for the low-mass planets is not yet fully confirmed or quantified observationally.

To address this problem, we have been using HARPS radial-velocity observations to study a sample of metal-poor stars. Our goal is to detect low-mass planets, with masses close to that of the Earth and Neptune, and to estimate their frequency around low-metallicity stars. I will present the latest results of this decade-long search, explain some of the difficulties that stellar activity poses on planet detection, and describe a new algorithm being developedto help with planet detection in radial-velocity data.

2017 May 24, 13:30

Centro de Astrofísica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia