Showing papers by "H. Bruntt published in 2000"
Space Telescope Science Institute1, National Center for Atmospheric Research2, University of California, Santa Cruz3, Wesleyan University4, University of Calgary5, University of Texas at Austin6, Aarhus University7, University of Arizona8, Harvard University9, University of California, Berkeley10, University of Geneva11, Pennsylvania State University12, University of Victoria13
TL;DR: In this paper, the authors used the Wide Field Planetary Camera 2 (WFPC2) filters to detect gas giant planets in the globular cluster 47 Tucanae, but no light curves resulted for which a convincing interpretation as a planet could be made.
Abstract: We 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 Wide Field Planetary Camera 2 (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.
280 citations
01 May 2000
TL;DR: Gilliland et al. as mentioned in this paper described the methods of time-series analysis that were used to search the 47 Tuc data for transits by giant extrasolar planets, and the means by which these methods were validated.
Abstract: Gilliland et al. (2000) have reported HST photometric observations of 34000 stars in the globular cluster 47 Tuc, showing an absence of close-in giant planets in that cluster relative to their frequency in the solar neighborhood. Here we describe the methods of time-series analysis that were used to search the 47 Tuc data for transits by giant extrasolar planets, and the means by which these methods were validated.
4 citations
Journal Article•
TL;DR: Gilliland et al. as mentioned in this paper reported 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.
Abstract: Author(s): Gilliland, Ronald L; Brown, TM; Guhathakurta, P; Sarajedini, A; Milone, EF; Albrow, MD; Baliber, NR; Bruntt, H; Burrows, A; Charbonneau, D; Choi, P; Cochran, WD; Edmonds, PD; Frandsen, S; Howell, JH; Lin, DNC; Marcy, GW; Mayor, M; Naef, D; Sigurdsson, S; Stagg, CR; VandenBerg, DA; Vogt, SS; Williams, MD | Abstract: We 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.
1 citations