Known Eclipsing Binary with Unknown Third Body KID 11519226

Planet Hunters forum Talk member troyw has identified transit timing variations (TTVs) in a known eclipsing binary star system KID 11519226 using his Amateur Kepler Obvservatory (AKO) program. The TTVs indicate a third orbiting body associated with this system.

troyw:

This star system shows TTVs for both the primary and secondary sets of transits. The published period is 22.1745d, but the data started being collected during a prominent swing in the TTVs, throwing off the period slightly. A more accurate period looks like 22.162d.
image link




Note the change in the black horizontal line indicating the TTVs.

Kian Jek:

Nice find, Troy! The profile of the TTVs for the primary and the secondary eclipses are not quite the inverse of each other, as the curve-fits are slightly different in the O-C plot:




You can follow this eclipsing star system with an unknown third orbiting body here.