Saeed Hojjatpanah
IA and University of Zanjan, Iran

Abstract
The discovery of exoplanets provides key elements to understand the physical mechanisms involved in planetary systems formation, migration, and evolution. Among exoplanets, those transiting their host star are the only ones for which it is possible to accurately measure both their fundamental properties (mass and radius) as well as their orbital parameters (period, eccentricity). Moreover, they are the only ones that allow us to probe exoplanetary atmospheric composition and properties. The Kepler space telescope has detected thousands of such small transiting exoplanets, but less than 10% of them have been validated and only 2% of them have a mass constrained better than 30%. I will present results from our recent spectroscopic observations of K2 candidates using ground-based and high resolutionspectrographs (HARPS, HARPS-N and SOPHIE). I will discuss the confirmation and characterization of a new transiting Brown Dwarf and discovery of a new Neptune-size exoplanet.

22 March 2016, 13:30

Centro de Astrofísica da Universidade do Porto
Rua das Estrelas
4150-762 Porto