Journal
SCIENCE
Volume 332, Issue 6026, Pages 216-218Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1201762
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Funding
- NASA's Science Mission Directorate
- Hungarian Scientific Research Fund (OTKA) [K76816, K83790, MB08C 81013]
- Hungarian Academy of Sciences
- Magyary Zoltan Higher Educational Public Foundation
- American Astronomical Society
- NSF [AST09-08253]
- W. M. Keck Foundation
- NASA Exoplanet Science Center
- Deutsche Forschungsgemeinschaft [HA 3279/5-1]
- European Research Council (ERC) under the European Community [227224]
- Science and Technology Facilities Council [PP/D000955/1, ST/J000035/1, PP/F000057/1, ST/G002355/1] Funding Source: researchfish
- STFC [ST/J000035/1, PP/F000057/1, PP/D000955/1, ST/G002355/1] Funding Source: UKRI
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Hierarchical triple systems comprise a close binary and a more distant component. They are important for testing theories of star formation and of stellar evolution in the presence of nearby companions. We obtained 218 days of Kepler photometry of HD 181068 (magnitude of 7.1), supplemented by ground-based spectroscopy and interferometry, which show it to be a hierarchical triple with two types of mutual eclipses. The primary is a red giant that is in a 45-day orbit with a pair of red dwarfs in a close 0.9-day orbit. The red giant shows evidence for tidally induced oscillations that are driven by the orbital motion of the close pair. HD 181068 is an ideal target for studies of dynamical evolution and testing tidal friction theories in hierarchical triple systems.
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