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Characterization of star-planet systems

Vera M. Passegger
University of Göttingen

The CARMENES project will carry out a new planet survey on M-dwarfs. The new high-resolution spectrographs, operating in the visible and near-infrared, will become operational at the end of 2015 at Calar Alto Observatory. They will perform high-precision radial-velocity measurements (goal 1 m s-1) of about 300 M-dwarfs with the aim to detect low-mass planets within the habitable zones of their host stars. I have characterized the candidate sample for CARMENES and provide fundamental parameters for these stars in order to constrain planetary properties. Using state-of-the-art model atmospheres (PHOENIX-ACES) and chi2-minimization with a downhill-simplex method I determine effective temperature, surface gravity, metallicity and rotational velocity for high-resolution spectra taken with FEROS and CAFE. Finding discrepancies between the obtained parameters and literature values, I investigated near-infrared K- and J-bands using TripleSpec and X-Shooter data. I found deficiencies in the PHOENIX-ACES models, however it was possible to get good results for temperature and log g. The experiences made in the near-infrared will help to better understand spectral characterization in the visible range.

2015 May 06, 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