Gilliland RLBrown TMGuhathakurta PSarajedini AMilone EFAlbrow MDBaliber NRBruntt HBurrows ACharbonneau DChoi PCochran WDEdmonds PDFrandsen SHowell JHLin DNCMarcy GWMayor MNaef DSigurdsson SStagg CRVandenBerg DAVogt SSWilliams MD2018-05-032018-05-032000http://hdl.handle.net/10092/15286We report results from a large Hubble Space Telescope project to observe a significant (~34,000) ensemble of main sequence stars in the globular cluster 47 Tucanae with a goal of defining the frequency of inner-orbit, gas-giant planets. Simulations based on the characteristics of the 8.3 days of time-series data in the F555W and F814W WFPC2 filters show that ~17 planets should be detected by photometric transit signals if the frequency of hot Jupiters found in the solar neighborhood is assumed to hold for 47 Tuc. The experiment provided high-quality data sufficient to detect planets. A full analysis of these WFPC2 data reveals ~75 variables, but NO light curves resulted for which a convincing interpretation as a planet could be made. The planet frequency in 47 Tuc is at least an order of magnitude below that for the solar neighborhood. The cause of the absence of close-in planets in 47 Tuc is not yet known; presumably the low metallicity and/or crowding of 47 Tuc interfered with planet formation, with orbital evolution to close-in positions, or with planet survival.enastro-phbinaries: eclipsingglobular clusters: (NGC 104, 47 Tucanae)planetary systemstechniques: photometricJournal Article2018-01-17Fields of Research::51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systemsField of Research::02 - Physical Sciences::0201 - Astronomical and Space Sciences