A Lack of Planets in 47 Tucanae from an HST Search

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dc.contributor.authorGilliland RL
dc.contributor.authorBrown TM
dc.contributor.authorGuhathakurta P
dc.contributor.authorSarajedini A
dc.contributor.authorMilone EF
dc.contributor.authorAlbrow MD
dc.contributor.authorBaliber NR
dc.contributor.authorBruntt H
dc.contributor.authorBurrows A
dc.contributor.authorCharbonneau D
dc.contributor.authorChoi P
dc.contributor.authorCochran WD
dc.contributor.authorEdmonds PD
dc.contributor.authorFrandsen S
dc.contributor.authorHowell JH
dc.contributor.authorLin DNC
dc.contributor.authorMarcy GW
dc.contributor.authorMayor M
dc.contributor.authorNaef D
dc.contributor.authorSigurdsson S
dc.contributor.authorStagg CR
dc.contributor.authorVandenBerg DA
dc.contributor.authorVogt SS
dc.contributor.authorWilliams MD
dc.date.accessioned2018-05-03T00:26:36Z
dc.date.available2018-05-03T00:26:36Z
dc.date.issued2000en
dc.date.updated2018-01-17T14:22:51Z
dc.description.abstractWe 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.en
dc.identifier.urihttp://hdl.handle.net/10092/15286
dc.language.isoen
dc.subjectastro-phen
dc.subjectbinaries: eclipsingen
dc.subjectglobular clusters: (NGC 104, 47 Tucanae)en
dc.subjectplanetary systemsen
dc.subjecttechniques: photometricen
dc.subject.anzsrcFields of Research::51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systemsen
dc.subject.anzsrcField of Research::02 - Physical Sciences::0201 - Astronomical and Space Sciencesen
dc.titleA Lack of Planets in 47 Tucanae from an HST Searchen
dc.typeJournal Articleen
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