title: HD 181068: a red giant in a triply eclipsing compact hierarchical triple system.
abstract: 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.
authors.affiliation: Department of Astronomy, Eötvös University, Budapest, Hungary. derekas@konkoly.hu
authors.forename: A
authors.initials: A
authors.lastname: Derekas
authors.forename: L L
authors.initials: LL
authors.lastname: Kiss
authors.forename: T
authors.initials: T
authors.lastname: Borkovits
authors.forename: D
authors.initials: D
authors.lastname: Huber
authors.forename: H
authors.initials: H
authors.lastname: Lehmann
authors.forename: J
authors.initials: J
authors.lastname: Southworth
authors.forename: T R
authors.initials: TR
authors.lastname: Bedding
authors.forename: D
authors.initials: D
authors.lastname: Balam
authors.forename: M
authors.initials: M
authors.lastname: Hartmann
authors.forename: M
authors.initials: M
authors.lastname: Hrudkova
authors.forename: M J
authors.initials: MJ
authors.lastname: Ireland
authors.forename: J
authors.initials: J
authors.lastname: Kovács
authors.forename: Gy
authors.initials: G
authors.lastname: Mezo
authors.forename: A
authors.initials: A
authors.lastname: Moór
authors.forename: E
authors.initials: E
authors.lastname: Niemczura
authors.forename: G E
authors.initials: GE
authors.lastname: Sarty
authors.forename: Gy M
authors.initials: GM
authors.lastname: Szabó
authors.forename: R
authors.initials: R
authors.lastname: Szabó
authors.forename: J H
authors.initials: JH
authors.lastname: Telting
authors.forename: A
authors.initials: A
authors.lastname: Tkachenko
authors.forename: K
authors.initials: K
authors.lastname: Uytterhoeven
authors.forename: J M
authors.initials: JM
authors.lastname: Benko
authors.forename: S T
authors.initials: ST
authors.lastname: Bryson
authors.forename: V
authors.initials: V
authors.lastname: Maestro
authors.forename: A E
authors.initials: AE
authors.lastname: Simon
authors.forename: D
authors.initials: D
authors.lastname: Stello
authors.forename: G
authors.initials: G
authors.lastname: Schaefer
authors.forename: C
authors.initials: C
authors.lastname: Aerts
authors.forename: T A
authors.initials: TA
authors.lastname: ten Brummelaar
authors.forename: P
authors.initials: P
authors.lastname: De Cat
authors.forename: H A
authors.initials: HA
authors.lastname: McAlister
authors.forename: C
authors.initials: C
authors.lastname: Maceroni
authors.forename: A
authors.initials: A
authors.lastname: Mérand
authors.forename: M
authors.initials: M
authors.lastname: Still
authors.forename: J
authors.initials: J
authors.lastname: Sturmann
authors.forename: L
authors.initials: L
authors.lastname: Sturmann
authors.forename: N
authors.initials: N
authors.lastname: Turner
authors.forename: P G
authors.initials: PG
authors.lastname: Tuthill
authors.forename: J
authors.initials: J
authors.lastname: Christensen-Dalsgaard
authors.forename: R L
authors.initials: RL
authors.lastname: Gilliland
authors.forename: H
authors.initials: H
authors.lastname: Kjeldsen
authors.forename: E V
authors.initials: EV
authors.lastname: Quintana
authors.forename: P
authors.initials: P
authors.lastname: Tenenbaum
authors.forename: J D
authors.initials: JD
authors.lastname: Twicken