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EP: Fachverband Extraterrestrische Physik
EP 6: Exoplaneten und Astrobiologie
EP 6.1: Vortrag
Donnerstag, 20. März 2014, 10:30–10:45, DO24 1.103
The Planetary System to KIC 11442793: A Compact Analogue to the Solar System — •J. Cabrera1, Sz. Csizmadia1, H. Lehmann2, R. Dvorak3, D. Gandolfi4,5, H. Rauer1,6, A. Erikson1, C. Dreyer1,6, Ph. Eigmueller1, and A. Hatzes2 — 1Institute fuer Planetenforschung, DLR, Rutherfordstrasse 2, D-12489 Berlin — 2Thueringer Landessternwarte, D-07778 Tautenburg — 3Universitaetssternwarte Wien, Tuerkenschanzstr. 17, A-1180 Wien — 4INAF - Catania Astrophysical Observatory, Via S.Sofia 78, I-95123 Catania — 5ESTEC/ESA, PO Box 299 NL-2200 AG Noordwijk — 6ZAA, TU Berlin, Hardenbergstr. 36, D-10623 Berlin
We announce the discovery of a planetary system with 7 transiting planets around a Kepler target, a current record for transiting systems. Planets h and g are gas giants and show strong dynamical interactions. The orbit of planet g is perturbed in such way that its orbital period changes by 25.7h between two consecutive transits during the length of the observations, which is the largest such perturbation found so far. The rest of the planets also show mutual interactions: planets d, e and f are super-Earths close to a mean motion resonance chain (2:3:4), and planets b and c, with sizes below 2 Earth radii, are within 0.5% of the 4:5 mean motion resonance. This complex system presents some similarities to our Solar System, with small planets in inner orbits and gas giants in outer orbits. It is, however, more compact. The outer planet has an orbital distance around 1 AU, and the relative position of the gas giants is opposite to that of Jupiter and Saturn. The dynamical interactions between planets are also much richer.