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PhD. Topics

Astronomical Institute

Doubly and multiply eclipsing systems
PhD. program
Astronomy and Astrophysics
Name of the supervisor
RNDr. Theodor Pribulla, CSc.
Receiving school
Faculty of Mathematics, Physics and Informatics
Focus of the research: Systematic satellite observations aiming at the detection and study of exoplanets (CoRoT, KEPLER, TESS) lead to discovery of triple and quadruple stellar systems showing eclipses both in the inner and outer orbits (multiply eclipsing) or both inner orbits (doubly eclipsing). Because the geometry of the eclipses depends on the size and the mutual inclination of the orbits, it is possible to determine masses of the components without a need for spectroscopic observations. In the case that high-dispersion spectroscopy is available, it is possible to improve the parameters and to derive more parameters. Spectroscopy taken during the eclipses enables us to determine projected spin-axis orbital plane misalignment by using so-called Rossiter-McLaughlin effect. The misalignment strongly affects the apsidal motion rate in systems with eccentric orbits. It also provides us an information on the evolutionary history of the particular multiple system. If the outer-to-inner orbital period ratio is small, it is possible to observe anomalous apsidal motion and sometimes also perturbations of the inner orbits. Modeling of such systems requires inclusion of various effects (for example the finite speed of the light, reflection effect, ellipticity of the components, gravitational darkening). Modeling of high-precision satellite photometry is exacting and requires realistic models and accurate synthesis of observables. Systematic differences of the model and observed light curves point to other yet unknown effects or model inaccuracies (e.g., gravity darkening and reflection effect).
Objectives: Detection and modeling doubly and multiply eclipsing systems. Determination of the orbital and absolute parameters of the components. Including fine light-curve effects in the modeling of eclipses.

good knowledge of English, knowledge of programming, ability to work independently with literature

Affiliation: Astronomical Institute of the Slovak Academy of Sciences, Stellar Department, Tatranská Lomnica

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