title: KOI-126: a triply eclipsing hierarchical triple with two low-mass stars.
abstract: The Kepler spacecraft has been monitoring the light from 150,000 stars in its primary quest to detect transiting exoplanets. Here, we report on the detection of an eclipsing stellar hierarchical triple, identified in the Kepler photometry. KOI-126 [A, (B, C)], is composed of a low-mass binary [masses M(B) = 0.2413 ± 0.0030 solar mass (M(⊙)), M(C) = 0.2127 ± 0.0026 M(⊙); radii R(B) = 0.2543 ± 0.0014 solar radius (R(⊙)), R(C) = 0.2318 ± 0.0013 R(⊙); orbital period P(1) = 1.76713 ± 0.00019 days] on an eccentric orbit about a third star (mass M(A) = 1.347 ± 0.032 M(⊙); radius R(A) = 2.0254 ± 0.0098 R(⊙); period of orbit around the low-mass binary P(2) = 33.9214 ± 0.0013 days; eccentricity of that orbit e(2) = 0.3043 ± 0.0024). The low-mass pair probe the poorly sampled fully convective stellar domain offering a crucial benchmark for theoretical stellar models.
authors.affiliation: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA. jacarter@cfa.harvard.edu
authors.forename: Joshua A
authors.initials: JA
authors.lastname: Carter
authors.forename: Daniel C
authors.initials: DC
authors.lastname: Fabrycky
authors.forename: Darin
authors.initials: D
authors.lastname: Ragozzine
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Holman
authors.forename: Samuel N
authors.initials: SN
authors.lastname: Quinn
authors.forename: David W
authors.initials: DW
authors.lastname: Latham
authors.forename: Lars A
authors.initials: LA
authors.lastname: Buchhave
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Van Cleve
authors.forename: William D
authors.initials: WD
authors.lastname: Cochran
authors.forename: Miles T
authors.initials: MT
authors.lastname: Cote
authors.forename: Michael
authors.initials: M
authors.lastname: Endl
authors.forename: Eric B
authors.initials: EB
authors.lastname: Ford
authors.forename: Michael R
authors.initials: MR
authors.lastname: Haas
authors.forename: Jon M
authors.initials: JM
authors.lastname: Jenkins
authors.forename: David G
authors.initials: DG
authors.lastname: Koch
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.forename: Jack J
authors.initials: JJ
authors.lastname: Lissauer
authors.forename: Phillip J
authors.initials: PJ
authors.lastname: MacQueen
authors.forename: Christopher K
authors.initials: CK
authors.lastname: Middour
authors.forename: Jerome A
authors.initials: JA
authors.lastname: Orosz
authors.forename: Jason F
authors.initials: JF
authors.lastname: Rowe
authors.forename: Jason H
authors.initials: JH
authors.lastname: Steffen
authors.forename: William F
authors.initials: WF
authors.lastname: Welsh