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We present a test for spin-orbit alignment for the host stars of 25 candidateplanetary systems detected by the {\it Kepler} spacecraft. The inclinationangle of each star's rotation axis was estimated from its rotation period,rotational line broadening, and radius. The rotation periods were determinedusing the {\it Kepler} photometric time series. The rotational line broadeningwas determined from high-resolution optical spectra with Subaru/HDS. Those samespectra were used to determine the star's photospheric parameters (effectivetemperature, surface gravity, metallicity) which were then interpreted withstellar-evolutionary models to determine stellar radii. We combine the newsample with the 7 stars from our previous work on this subject, finding thatthe stars show a statistical tendency to have inclinations near 90$^\circ$, inalignment with the planetary orbits. Possible spin-orbit misalignments are seenin several systems, including three multiple-planet systems (KOI-304, 988,2261). Ideally these systems should be scrutinized with complementarytechniques---such as the Rossiter-McLaughlin effect, starspot-crossinganomalies or asteroseismology---but the measurements will be difficult owing tothe relatively faint apparent magnitudes and small transit signals in thesesystems.

Measurements of Stellar Inclinations for Kepler Planet Candidates II: Candidate Spin-Orbit Misalignments in Single and Multiple-Transiting Systems