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arxiv: 1106.4530 · v1 · pith:COBXBLJYnew · submitted 2011-06-22 · 🌌 astro-ph.SR · astro-ph.EP

The architecture of the hierarchical triple star KOI 928 from eclipse timing variations seen in Kepler photometry

J. H. Steffen (1) , S. N. Quinn (2) , W. J. Borucki (3) , E. Brugamyer (4) , S. T. Bryson (3) , L. A. Buchhave (5) W. D. Cochran (4) , M. Endl (4) , D. C. Fabrycky (6)
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E. B. Ford (7) M. J. Holman (2) J. Jenkins (3 8) D. Koch (3) D. W. Latham (2) P. MacQueen (4) F. Mullally (3 A. Prsa (9) D. Ragozzine (2) J. F. Rowe (3) D. T. Sanderfer (3) S. E. Seader (3 8) D. Short (10) A. Shporer (11) S. E. Thompson (3 G. Torres (2) J. D. Twicken (3 8) W. F. Welsh (10) G. Windmiller (10) ((1) Fermilab Center for Particle Astrophysics Batavia (2) Harvard-Smithsonian Center for Astrophysics Cambridge (3) NASA Ames Research Center Moffett Field (4) McDonald Observatory The University of Texas Austin (5) Niels Bohr Institute Copenhagen University Copenhagen (6) Department of Astronomy Astrophysics University of California Santa Cruz Santa Cruz (7) Department of Astronomy University of Florida Gainesville (8) SETI Institute Mountain View (9) Villanova University Department of Astronomy Villanova (10) San Diego State University San Diego (11) Las Cumbres Observatory Global Telescope Goleta)
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classification 🌌 astro-ph.SR astro-ph.EP
keywords binarystareclipseorbitalarchitecturehierarchicalkeplermass
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We present a hierarchical triple star system (KIC 9140402) where a low mass eclipsing binary orbits a more massive third star. The orbital period of the binary (4.98829 Days) is determined by the eclipse times seen in photometry from NASA's Kepler spacecraft. The periodically changing tidal field, due to the eccentric orbit of the binary about the tertiary, causes a change in the orbital period of the binary. The resulting eclipse timing variations provide insight into the dynamics and architecture of this system and allow the inference of the total mass of the binary ($0.424 \pm 0.017 \text{M}_\odot$) and the orbital parameters of the binary about the central star.

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