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We report a joint analysis of the Rossiter-McLaughlin (RM) effect with Subaruand the Kepler photometry for Kepler Object of Interest (KOI) 94 system. Thesystem comprises four transiting planet candidates with orbital periods of 22.3(KOI-94.01), 10.4 (KOI-94.02), 54.3 (KOI-94.03), and 3.7 (KOI-94.04) days fromthe Kepler photometry. We performed the radial velocity (RV) measurement of thesystem with the Subaru 8.2 m telescope on August 10, 2012 (UT), covering acomplete transit of KOI-94.01 for $\sim 6.7$ hours. The resulting RV variationdue to the RM effect spectroscopically confirms that KOI-94.01 is indeed thetransiting planet, and implies that its orbital axis is well aligned with thestellar spin axis; the projected spin-orbit angle $\lambda$ is estimated as$-6_{-11}^{+13}$ deg. This is the first measurement of the RM effect for amultiple transiting system. Remarkably, the archived Kepler lightcurve aroundBJD=2455211.5 (date in UT January 14/15, 2010) indicates a "ouble transit"event of KOI-94.01 and KOI-94.03, in which the two planets transit the stellardisk simultaneously. Moreover, the two planets partially overlap each other,and exhibit a "planet-planet eclipse" around the transit center. This providesa rare opportunity to put tight constraints on the configuration of the twotransiting planets by joint analysis with our Subaru RM measurement. Indeed, wefind that the projected mutual inclination of KOI-94.01 and KOI-94.03 isestimated to be $\delta = -1.15 \pm 0.55$ deg. Implications for the migrationmodel of multiple planet systems are also discussed.

the astrophysical journal. letters

Planet-Planet Eclipse and the Rossiter-McLaughlin Effect of a Multiple  Transiting System: Joint Analysis of the Subaru Spectroscopy and the Kepler  Photometry