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EP: Fachverband Extraterrestrische Physik

EP 4: Poster Session

EP 4.14: Poster

Dienstag, 26. Februar 2013, 11:15–12:45, Poster OG

TTV@YETI: Analysing Transit-Timing-Variations using ground-based observations — •Martin Seeliger¹, Gracjan Maciejewski², and Ralph Neuhäuser¹ — ¹Astrophysical Institute and University Observatory Jena — ²Torun Centre for Astronomy, Poland

The transit timing variation (TTV) method, that was already successfully applied to space-based (i.e. Kepler) data, is sensitive to small perturbing masses in orbits near the low-order mean-motion resonances. However, deriving the orbital elements and mass of the perturber from TTV is a difficult inverse problem that requires many observations to at least partially remove degeneracies and point out the most probable configuration.

So far, we have observed transits of selected known transiting planets with known or suspected non-zero eccentricities and/or scatter in the radil-velocity orbit solution (which may indicate additional planets in the system). We could show that the achievable precision using ground-based data allows us to find planets as described above. Since single-site ground-based observations are not sufficient, we use the YETI-network, a consortium of small- to medium-size telescopes around the world to be able to cover all longitudes, allowing us to observe transits at certain phases and to probe certain frequencies in the periodogram, even though they would not be observable from single-site monitoring. Hence we are now able to compensate the disadvantages of ground-based observations.