Taking the Measure of Planets in the Globular Cluster 47 Tucanae

Details Taking the Measure of Planets in the Globular Cluster 47 Tucanae Taking the Measure of Planets in the Globular Cluster 47 Tucanae

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8267g&link_type=abstract

HST Proposal ID #8267

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Hst Proposal Id #8267 Cool Stars

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We propose a sensitive search for planetary companions in close orbits around upper main sequence stars in 47 Tuc via transit signals from WFPC2 time-series photometry. About fifty such systems will be detected with planetary radii errors of only 2-4% from the signal depth, and accurate periods from at least two transits. Follow-up radial-velocity spectroscopy from the VLT and/or Gemini should provide velocity measurements for the best 25% of candidates to provide planetary masses {sin{i} 1 from transits}. Densities to 15-20% 1-sigma errors will follow for planets with approximately Jovian mass and size providing for the first time meaningful, physical constraints on extra-solar-planet theory. Many other science applications will follow from these extensive observations, e.g., U, V, I imaging well down the White Dwarf cooling sequence in the cluster core, bottom of main sequence definition to M_V 13.8, M_I 12.8, and a definitive survey for eclipsing binaries. We propose this as a major survey program that will result in a unique and valuable addition to the HST archive. Albeit "scientifically risky" in that planets are not yet known to exist in globular clusters, there is little technical risk - HST is uniquely capable of providing the requisite, high-dynamic range, time-series photometry.

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