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The radial velocity-discovered exoplanet HD 97658b was recently announced totransit, with a derived planetary radius of 2.93 \pm 0.28 R_{Earth}. As atransiting super-Earth orbiting a bright star, this planet would make anattractive candidate for additional observations, including studies of itsatmospheric properties. We present and analyze follow-up photometricobservations of the HD 97658 system acquired with the MOST space telescope. Ourresults show no transit with the depth and ephemeris reported in theannouncement paper. For the same ephemeris, we rule out transits for a planetwith radius larger than 2.09 R_{Earth}, corresponding to the reported 3\sigmalower limit. We also report new radial velocity measurements which continue tosupport the existence of an exoplanet with a period of 9.5 days, and obtainimproved orbital parameters.

Non-detection of previously reported transits of HD 97658b with MOST photometry