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The exoplanets discovered so far have been mostly around relatively nearbyand bright stars. As a result, the host stars are mostly (i) in the Galacticdisk, (ii) relatively massive, and (iii) relatively metal rich. The aim of theSWEEPS project is to extend our knowledge to stars which (i) are in a differentpart of the Galaxy, (ii) have lower masses, and (iii) have a large range ofmetallicities. To achieve this goal, we used the Hubble Space Telescope tosearch for transiting planets around F, G, K, and M dwarfs in the Galacticbulge. We photometrically monitored 180,000 stars in a dense bulge fieldcontinuously for 7 days. We discovered 16 candidate transiting extrasolarplanets with periods of 0.6 to 4.2 days, including a new class of ultra-shortperiod planets (USPPs) with P < 1.2 days. Radial-velocity observations of thetwo brightest candidates support their planetary nature. These results suggestthat planets are as abundant in the Galactic bulge as they are in the solarneighborhood, and they are equally abundant around low-mass stars (within afactor 2). The planet frequency increases with metallicity even for the starsin the Galactic bulge. All the USPP hosts are low-mass stars, suggesting eitherthat close-in planets around higher-mass stars are irradiatively evaporated, orthat the planets can migrate to close-in orbits only around such old andlow-mass stars.

Planets in the Galactic Bulge: Results from the SWEEPS Project