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Kepler-88
Kepler-88 is a Sun-like star with two confirmed planets. In April 2012, scientists discovered that a Kepler candidate KOI-142.01 (Kepler-88b) exhibited very significant transit timing variations caused by a non-transiting planet.〔( KOI-142, the King of Transit Variations, is a Pair of Planets near the 2:1 Resonance ): David Nesvorny, David Kipping, Dirk Terrell, Joel Hartman, Gaspar A. Bakos, Lars A. Buchhave. 15 April 2013〕 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. The non-transiting planet was further confirmed through the radial velocity method in November 2013.〔(SOPHIE velocimetry of kepler transit candidates:X KOI-142c: first radial velocity confirmation of a non-transiting exoplanet discovered by transit timing ): S.C.C. Barros (1), R. F. Diaz, A. Santerne, G. Bruno, M. Deleuil, J.M. Almenara, A.S. Bonomo, F. Bouchy, C. Damiani, G. Hebrard, G. Montagnier, C. Moutou (1- Laboratoire d'astrophysique de Marseille)2〕
==Planetary system==
Kepler-88's inner planet is Neptune-sized but almost half as dense. The outer planet is about 60% as massive as Jupiter but its radius is not known due to not transiting the planet.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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