Tags: Star.
Kepler-88 is a Sun-like star with two confirmed planets. In April of 2012 scientists discovered that a Kepler candidate KOI-142.01 (Kepler-88b) exhibited very significant transit timing variations caused by a non-transiting planet. Timing variations were large enough to cause changes to transit durations to Kepler-88b as well. Large transit timing variations helped to put tight constraints to masses of both planets.