A Lack of Planets in 47 Tucanae from an HST Search

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dc.creatorGilliland, Ronald L.
dc.creatorBrown, T. M.
dc.creatorGuhathakurta, P.
dc.creatorSarajedini, A.
dc.creatorMilone, E. F.
dc.creatorAlbrow, M. D.
dc.creatorBaliber, N. R.
dc.creatorBruntt, H.
dc.creatorBurrows, A.
dc.creatorCharbonneau, D.
dc.creatorChoi, P.
dc.creatorCochran, W. D.
dc.creatorEdmonds, P. D.
dc.creatorFrandsen, S.
dc.creatorHowell, J. H.
dc.creatorLin, D. N. C.
dc.creatorMarcy, G. W.
dc.creatorMayor, M.
dc.creatorNaef, D.
dc.creatorSigurdsson, S.
dc.creatorStagg, C. R.
dc.creatorVandenBerg, D. A.
dc.creatorVogt, S. S.
dc.creatorWilliams, M. D.
dc.date2000-09-25
dc.date2000-10-11
dc.date.accessioned2026-07-07T01:55:38Z
dc.date.available2026-07-07T01:55:38Z
dc.descriptionWe 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.
dc.description14 pages, 4 figures, accepted for publication in the Astrophysical Journal Letters
dc.identifierhttps://arxiv.org/abs/astro-ph/0009397
dc.identifierhttp://arxiv.org/abs/astro-ph/0009397
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1724
dc.subjectAstrophysics
dc.titleA Lack of Planets in 47 Tucanae from an HST Search
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