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We have made a comprehensive transit search for exoplanets down to about 2Earth radii in the HD 209458 system, based on nearly uninterrupted broadbandoptical photometry obtained with the MOST (Microvariability and Oscillations ofStars) satellite, spanning 14 days in 2004 and 44 days in 2005. We havesearched these data for limb-darkened transits at periods other than that ofthe known giant planet, from about 0.5 days to 2 weeks. Monte Carlo statisticaltests of the data with synthetic transits inserted allow us to rule outadditional close-in exoplanets with sizes ranging from about 0.20-0.36 RJ(Jupiter radii), or 2.2-4.0 RE (Earth radii) on orbits whose planes are nearthat of HD 209458b. These null results constrain theories that invoke lowermass planets in orbits similar to HD 209458b to explain its anomalously largeradius, and those that predict "hot Earths" due to the inward migration of HD209458b.Comment: 17 pages, 7 Figures. Published in Ap

Looking for Giant Earths in the HD 209458 System: A Search for Transits inMOSTSpace‐based Photometry